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v7.4-rc1
3015 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
9c7e3d5910 |
hyperv-next for v7.4-rc1
-----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEIbPD0id6easf0xsudhRwX5BBoF4FAmri3mgTHHdlaS5saXVA a2VybmVsLm9yZwAKCRB2FHBfkEGgXpRSB/49w0SPLd5RYa+fdq3qdvwr6+UJbkxp +F0n4keD03UCEcKljMsUBKdhD3qJnj1IB0/NR34Pr7YR4Yhv0YxodQK40nWBCFLd nsc99jw+d7TbepxsVwGqiwIzaWtidJwLw7DoBbagGUYFAFVkxlj6W+7S2e6hKcJH pDx92x5myMpUyEKuA8DNTWyMLNk9iysPxvQq/WSjY36roxkdvA5pwDhzi3hLoZw4 kfLuT+yKtKGwL+1dhn4gz0aYsuIq1wu36GlPMRfDU+cl96KGHEnUW861JrnqHpaU ccTRX7O2yKUSjPaYZZaqPa1ZW8R5L9DEpQxJA1Ilaw4Z9rXaQUmqC3OR =A5Bb -----END PGP SIGNATURE----- Merge tag 'hyperv-next-signed-20261028' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux Pull hyperv updates from Wei Liu: - Update to documents and code comments (Michael Kelley) - Harden Vmbus (Kameron Carr) - Rework MSHV driver page deposit logic (Mukesh Rathor) - Vmbus kexec bug fix (Shradha Gupta) - Miscellaneous bug fixes (Daehyeon Ko, Jiale Yao, Sasha Levin) * tag 'hyperv-next-signed-20261028' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: Drivers: hv: Remove leftover support for old Hyper-V versions mshv: Remove unused *_old memory deposit functions mshv: Redesign hypervisor memory deposit logic mshv: Rename memory deposit memory functions to _old mshv_vtl: reject poll files with multiple waitqueues mshv_vtl: detach poll waiter on POLLFREE mshv_vtl: initialize poll file mutex before device registration Documentation: hyperv: Update information on guest CPU offlining Documentation: hyperv: Remove support for guests on Hyper-V 2012/2012R2 Drivers: hv: Run VMBus kexec cleanup from syscore shutdown kexec: Add helper to report an active kexec reboot tools: hv: remove unused rte_smp_mb() Documentation: hyperv: Update documentation for sending VMBus packets Drivers: hv: vmbus: Check ACPI companion before use Documentation: hyperv: Describe validation of the ring buffer indices Drivers: hv: vmbus: Keep the ring byte counts sane for a bad index Drivers: hv: vmbus: Compute ring byte counts from a caller-held snapshot Drivers: hv: vmbus: Use *_ONCE() to access shared ring buffer indices Drivers: hv: vmbus: Bounds check the shared ring buffer indices |
||
|
Linus Torvalds
|
8a36f53fd5 |
mm.git review status for linus..mm-stable
Everything:
Total patches: 213
Fixes: tags: 69
cc:stable patches: 43
Reviews/patch: 2.04
Reviewed rate: 86%
Excluding DAMON:
Total patches: 192
Fixes: tags: 63
cc:stable patches: 39
Reviews/patch: 2.18
Reviewed rate: 89%
Excluding DAMON and selftests:
Total patches: 182
Fixes: tags: 57
cc:stable patches: 39
Reviews/patch: 2.23
Reviewed rate: 89%
Summary of series in this merge:
- "mm: make VMA flag semantics explicit, eliminate VM_SPECIAL"
(Lorenzo Stoakes (ARM)):
Replace VM_SPECIAL with helpers describing mapping ownership and
behavior. Enforce the mmap flag rules and convert affected drivers,
removing ambiguous tests shared by driver mappings and ordinary memory.
- "support kselftest on nommu platform" (Hajime Tazaki):
Add opt-in mmap and mremap tests for NOMMU systems. Teach the runner to
avoid its fork-dependent timeout command and document the build and
runtime requirements.
- "mm/collapse: separate a collapse from its callers"
(Kiryl Shutsemau (Meta)):
Separate huge-page collapse from caller policy. Replace khugepaged
identity checks with explicit permissions, and separate scanning from
collapse with the mmap_lock drop in one place.
- "mm: implement and use vma_has_anon_rmap(), silence KCSAN"
(Lorenzo Stoakes (ARM)):
Provide a common helper for testing whether a VMA has anonymous reverse
mappings. Document the locking rules, annotate intentional concurrent
reads for KCSAN, and convert the core MM callers.
- "mm/sparse: remove SECTION_MARKED_PRESENT and further cleanups"
(David Hildenbrand (Arm)):
Remove SECTION_MARKED_PRESENT in favor of the early-section flag.
Simplify sparse memory initialization, section metadata handling and
related PFN validity checks.
- "sh: remove NUMA and SPARSEMEM support" (Mike Rapoport (Microsoft)):
Remove SuperH NUMA and SPARSEMEM support. The extra memory banks have
been unusable since the NO_BOOTMEM conversion, leaving only the code and
data overhead.
- "mm: Unify device DAX and HugeTLB vmemmap population paths"
(Muchun Song):
Unify the generic device DAX and HugeTLB vmemmap population paths and
shared tail-page handling. Remove the duplicate DAX machinery while
retaining the powerpc radix implementation.
- "kselftest: mm: fix some failure of split_huge_page_test" (Yeoreum Yun):
Fix huge-page split tests racing with khugepaged recollapse. Use pagemap
and page flags instead of VMA-boundary assumptions which fail when glibc
has already enabled THP.
- "memcg: move memcgid refcount to objcg to unpin dying memcgs"
(Bingfang Guo):
Let dying memcgs be freed while swapped-out shmem still holds their IDs.
Move ID references to reparentable objcgs, with the necessary swap
accounting and RCU lifetime changes.
- "mm/truncate: fix data loss when truncating straddling large folios"
(Zhang Yi):
Preserve out-of-range data when truncating straddling large folios. Fix
a lookup race and split-failure handling, and handle minimum folio orders
for the forthcoming ext4 iomap buffered I/O path.
- "mm/damon: introduce damos quota goal target metric complement flag"
(SJ Park):
Let DAMOS quota goals use a metric's complement, so utilization can also
express free-memory goals without adding separate metrics. Add the sysfs
interface, documentation and tests.
- "arm64/mm: Standardize printing for pgtable entries" (Anshuman Khandual):
Use the generic formatter for arm64 page-table entries, ready for future
wider entries. Move the safe-PTE-update check out of the header to avoid
an include cycle.
- "mm: kmsan: fix iounmap metadata teardown" (Dima Koziuk):
Fix KMSAN metadata leaks on iounmap and failed ioremap allocations. Free
backing pages before removing their mappings, and share the teardown with
partial-allocation cleanup.
- "mm/damon/core: preserve quota state when constructing schemes"
(Karl Mehltretter):
Preserve running DAMOS quota state while validating parameter updates.
Even rejected updates could reset accounting and exceed the quota window;
add tests for both accepted and rejected updates.
- "mm/vmalloc: fix vmalloc_dump_obj VA lookup" (Ye Liu):
Fix vmalloc_dump_obj() lookups for last-page addresses and allocations
spanning vmap zones. These allocations were being missed in diagnostic
output.
- "mm: various (urgent?) fixes" (David Hildenbrand (Arm)):
Fix mmap charge leaks and hugetlb use-after-free, wrong-address
unmapping, stuck locks and endless faults. Also preserve reservations on
failed mremap and handle stale userfaultfd bits.
- "maple_tree: fix maple_range_64 crashes in RCU mode" (Dimitris Charisis):
Fix pointer and metadata confusion during RCU destruction of
maple_range_64 nodes, avoiding double frees and invalid accesses. Add a
regression test; no in-tree user currently uses this combination.
- "mm: fix hugetlb NR_HUGETLB accounting on folio migration" (Hongfu Li):
Fix hugetlb migration and preallocation accounting so /proc/vmstat
retains the correct count and memory.numa_stat follows the folio to its
new node.
- "mm/damon: fix a minor bug, clean code, and add a test" (SJ Park):
Fix 32-bit DAMON age overflow which made old regions look young. Share
hugetlb folio acquisition code and add a regression test for the
previously fixed last-region skipping bug.
- "mm/damon/core: cleanup code, reduce stack usage, and add kunit"
(SJ Park):
Reduce kdamond stack usage and remove unused enums. Add deterministic
PSI quota-goal tests which do not depend on the machine's current memory
pressure.
- "mm/damon: fix the temporal goal tuner's size quota conversion"
(Donggeun Yoo):
Bound the temporal tuner's quota conversion to prevent overflow and zero
effective quotas, which could stop schemes making progress. Add boundary
tests.
- "Don't use GFP_DMA when calling dma_alloc_coherent" (Baoquan He):
Remove redundant GFP_DMA flags from coherent DMA allocation calls. The
DMA API already selects the zone from device limits and ignores the
caller's flag.
- "kselftest: mm: fix intermittent failure khugepaged test" (Yeoreum Yun):
Propagate child-process failures in the khugepaged tests and prevent
background collapse from racing their checks. This removes false passes
and intermittent failures.
- "MAINTAINERS: cover all hugetlb headers under HUGETLB SUBSYSTEM"
(Enze Li):
Cover all hugetlb headers in MAINTAINERS so get_maintainer.pl finds the
right maintainers. Also label the closing hugetlb_cgroup.h include
guard.
Summary of the 65 singletons in this merge:
The singletons include a few worthwhile performance fixes. Avoiding
unnecessary reverse-map tree updates gave a reported 15.9% improvement
in UnixBench's execl test on a 192-core x86 system. A reclaim retry fix
stops defrag_mode from spinning under memory.low protection; a reported
file-creation stress test ran 5.7 times faster, with far less memory
pressure. Narrower hugetlb invalidations also spare KVM guests needless
refaults: the reported Redis-in-VM P99 QPS penalty while punching holes
fell from 7.09% to 1.45%.
Several fixes prevent lost data or corrupted memory. Lazyfree huge-page
races with mremap()/munmap() could lose data or access freed memory, and
MADV_COLD could lose a concurrent write's dirty bit. Another fix
prevents stale migration entries from outliving large folios. On
filesystems with blocks smaller than a page, extending a file by 4 GiB
or more could expose bytes written past the old EOF through mmap instead
of zeroes. That is fixed, along with use-after-free races in
PAGEMAP_SCAN during process exit and in memory-cgroup accounting on
PREEMPT_RT kernels.
Other fixes stop UFFDIO_MOVE spinning forever on pinned large folios,
which could wedge other memory operations, and stop mremap() leaking
commit charges until allocations fail under strict overcommit. A further
fix keeps userfaultfd tracking intact on neighboring mappings. NUMA
binding no longer prevents long-term pins when the chosen node has only
movable memory, fixing QEMU/VFIO startup and io_uring buffer
registration failures. MGLRU also gets a fix for early-boot crashes with
memory cgroups disabled at boot, notably in small crash kernels.
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Merge tag 'mm-stable-2026-10-25-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull more MM updates from Andrew Morton:
- "mm: make VMA flag semantics explicit, eliminate VM_SPECIAL" (Lorenzo
Stoakes):
Replace VM_SPECIAL with helpers describing mapping ownership and
behavior. Enforce the mmap flag rules and convert affected drivers,
removing ambiguous tests shared by driver mappings and ordinary
memory.
- "support kselftest on nommu platform" (Hajime Tazaki):
Add opt-in mmap and mremap tests for NOMMU systems. Teach the runner
to avoid its fork-dependent timeout command and document the build
and runtime requirements.
- "mm/collapse: separate a collapse from its callers" (Kiryl
Shutsemau):
Separate huge-page collapse from caller policy. Replace khugepaged
identity checks with explicit permissions, and separate scanning from
collapse with the mmap_lock drop in one place.
- "mm: implement and use vma_has_anon_rmap(), silence KCSAN" (Lorenzo
Stoakes):
Provide a common helper for testing whether a VMA has anonymous
reverse mappings. Document the locking rules, annotate intentional
concurrent reads for KCSAN, and convert the core MM callers.
- "mm/sparse: remove SECTION_MARKED_PRESENT and further cleanups"
(David Hildenbrand):
Remove SECTION_MARKED_PRESENT in favor of the early-section flag.
Simplify sparse memory initialization, section metadata handling and
related PFN validity checks.
- "sh: remove NUMA and SPARSEMEM support" (Mike Rapoport):
Remove SuperH NUMA and SPARSEMEM support. The extra memory banks have
been unusable since the NO_BOOTMEM conversion, leaving only the code
and data overhead.
- "mm: Unify device DAX and HugeTLB vmemmap population paths" (Muchun
Song):
Unify the generic device DAX and HugeTLB vmemmap population paths and
shared tail-page handling. Remove the duplicate DAX machinery while
retaining the powerpc radix implementation.
- "kselftest: mm: fix some failure of split_huge_page_test" (Yeoreum
Yun):
Fix huge-page split tests racing with khugepaged recollapse. Use
pagemap and page flags instead of VMA-boundary assumptions which fail
when glibc has already enabled THP.
- "memcg: move memcgid refcount to objcg to unpin dying memcgs"
(Bingfang Guo):
Let dying memcgs be freed while swapped-out shmem still holds their
IDs. Move ID references to reparentable objcgs, with the necessary
swap accounting and RCU lifetime changes.
- "mm/truncate: fix data loss when truncating straddling large folios"
(Zhang Yi):
Preserve out-of-range data when truncating straddling large folios.
Fix a lookup race and split-failure handling, and handle minimum
folio orders for the forthcoming ext4 iomap buffered I/O path.
- "mm/damon: introduce damos quota goal target metric complement flag"
(SJ Park):
Let DAMOS quota goals use a metric's complement, so utilization can
also express free-memory goals without adding separate metrics. Add
the sysfs interface, documentation and tests.
- "arm64/mm: Standardize printing for pgtable entries" (Anshuman
Khandual):
Use the generic formatter for arm64 page-table entries, ready for
future wider entries. Move the safe-PTE-update check out of the
header to avoid an include cycle.
- "mm: kmsan: fix iounmap metadata teardown" (Dima Koziuk):
Fix KMSAN metadata leaks on iounmap and failed ioremap allocations.
Free backing pages before removing their mappings, and share the
teardown with partial-allocation cleanup.
- "mm/damon/core: preserve quota state when constructing schemes" (Karl
Mehltretter):
Preserve running DAMOS quota state while validating parameter
updates. Even rejected updates could reset accounting and exceed the
quota window; add tests for both accepted and rejected updates.
- "mm/vmalloc: fix vmalloc_dump_obj VA lookup" (Ye Liu):
Fix vmalloc_dump_obj() lookups for last-page addresses and
allocations spanning vmap zones. These allocations were being missed
in diagnostic output.
- "mm: various (urgent?) fixes" (David Hildenbrand):
Fix mmap charge leaks and hugetlb use-after-free, wrong-address
unmapping, stuck locks and endless faults. Also preserve reservations
on failed mremap and handle stale userfaultfd bits.
- "maple_tree: fix maple_range_64 crashes in RCU mode" (Dimitris
Charisis):
Fix pointer and metadata confusion during RCU destruction of
maple_range_64 nodes, avoiding double frees and invalid accesses. Add
a regression test; no in-tree user currently uses this combination.
- "mm: fix hugetlb NR_HUGETLB accounting on folio migration" (Hongfu
Li):
Fix hugetlb migration and preallocation accounting so /proc/vmstat
retains the correct count and memory.numa_stat follows the folio to
its new node.
- "mm/damon: fix a minor bug, clean code, and add a test" (SJ Park):
Fix 32-bit DAMON age overflow which made old regions look young.
Share hugetlb folio acquisition code and add a regression test for
the previously fixed last-region skipping bug.
- "mm/damon/core: cleanup code, reduce stack usage, and add kunit" (SJ
Park):
Reduce kdamond stack usage and remove unused enums. Add deterministic
PSI quota-goal tests which do not depend on the machine's current
memory pressure.
- "mm/damon: fix the temporal goal tuner's size quota conversion"
(Donggeun Yoo):
Bound the temporal tuner's quota conversion to prevent overflow and
zero effective quotas, which could stop schemes making progress. Add
boundary tests.
- "Don't use GFP_DMA when calling dma_alloc_coherent" (Baoquan He):
Remove redundant GFP_DMA flags from coherent DMA allocation calls.
The DMA API already selects the zone from device limits and ignores
the caller's flag.
- "kselftest: mm: fix intermittent failure khugepaged test" (Yeoreum
Yun):
Propagate child-process failures in the khugepaged tests and prevent
background collapse from racing their checks. This removes false
passes and intermittent failures.
- "MAINTAINERS: cover all hugetlb headers under HUGETLB SUBSYSTEM"
(Enze Li):
Cover all hugetlb headers in MAINTAINERS so get_maintainer.pl finds
the right maintainers. Also label the closing hugetlb_cgroup.h
include guard.
Summary of the 65 singletons in this merge:
The singletons include a few worthwhile performance fixes. Avoiding
unnecessary reverse-map tree updates gave a reported 15.9% improvement
in UnixBench's execl test on a 192-core x86 system. A reclaim retry
fix stops defrag_mode from spinning under memory.low protection; a
reported file-creation stress test ran 5.7 times faster, with far less
memory pressure. Narrower hugetlb invalidations also spare KVM guests
needless refaults: the reported Redis-in-VM P99 QPS penalty while
punching holes fell from 7.09% to 1.45%.
Several fixes prevent lost data or corrupted memory. Lazyfree
huge-page races with mremap()/munmap() could lose data or access freed
memory, and MADV_COLD could lose a concurrent write's dirty bit.
Another fix prevents stale migration entries from outliving large
folios. On filesystems with blocks smaller than a page, extending a
file by 4 GiB or more could expose bytes written past the old EOF
through mmap instead of zeroes. That is fixed, along with
use-after-free races in PAGEMAP_SCAN during process exit and in
memory-cgroup accounting on PREEMPT_RT kernels.
Other fixes stop UFFDIO_MOVE spinning forever on pinned large folios,
which could wedge other memory operations, and stop mremap() leaking
commit charges until allocations fail under strict overcommit. A
further fix keeps userfaultfd tracking intact on neighboring mappings.
NUMA binding no longer prevents long-term pins when the chosen node
has only movable memory, fixing QEMU/VFIO startup and io_uring buffer
registration failures. MGLRU also gets a fix for early-boot crashes
with memory cgroups disabled at boot, notably in small crash kernels.
* tag 'mm-stable-2026-10-25-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (213 commits)
mm: multi-gen LRU: fix NULL lruvec->pgdat deref with memcg disabled on cmdline
mm/page_counter: use WRITE_ONCE() for emin/elow when parent is the root
mm/memcontrol: publish null pointer before dropping css reference
test_maple_tree: test maple_range_64 node in RCU mode
maple_tree: fix maple_range_64 crashes in RCU mode
mm/vma: avoid broken uffd merge on mremap
tools/testing/shared: catch a failed posix_memalign()
mm/damon/core: remove unreachable damos charge_{target,addr}_from
mm/shrinker: allocate shrinker_info_unit from a dedicated kmem_cache
riscv: mm: exclude invalid THP PMDs from page table check
mm/damon/core: filter out damos address filter-split failed region
fs/proc/task_mmu: pin mm_users in do_pagemap_scan()
mm/mempolicy: apply bind policies against the scoped allocation zone
mm/vmscan: reclaim every zone in per-node proactive reclaim
mm/mremap: correctly uncharge accountable VMAs in error path
mm/mremap: populate calculated fields in vrm state correctly
MAINTAINERS: add an entry for MEMORY MANAGEMENT - MEMORY MAP
mm: bdi: reset min_ratio after the sysfs attributes are gone
mm/page_vma_mapped: continue past nonmatching huge PMDs
selftests/mm: skip hugetlb cgroup v2 tests without the needed controllers
...
|
||
|
Linus Torvalds
|
126ad898a6 |
liveupdate: updates for 7.4-rc1
* Several small fixes to KHO and LiveUpdate selftest * A series that renames "KHO scratch" to "KHO bootmem" because this memory is way more important in kexec'ed kernels rather than in the original cold boot kernel and the new name reflects it. -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEeOVYVaWZL5900a/pOQOGJssO/ZEFAmrckxoACgkQOQOGJssO /ZFU4Qf/YuuTxIJu0oj9iYnd578+a/9ova4Wkbo6DT01ifG0LVKFPOlxA/+m/7RI T3ZlLQfM2TlpQ4TATXDK9f0g3A1OrgiarskOZOqTlgjFPyMTN4XMxsn0XcwijhV6 p9lEJwARBg7H0CRcmXb+GeWpp42b/HwTLAmePKUDXyLY+rZyuoLUvuCkhysPY92l cLqSSDTTxk4c2Hh+K1pbFihutd0fg+KPqilCieA2O0JX39rIRmJt6BK6IbGYKVrp eDDoLaFdXurr0IxfiGqYZSMsjYhLV4yRtfIX2KXjE9UI2ueI+nCAzYLA22AkIABO eh8kbQQQuXnVXP7uI6941c+gl3743A== =mZMU -----END PGP SIGNATURE----- Merge tag 'liveupdate-v7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux Pull liveupdate updates from Mike Rapoport: - Several small fixes to KHO and LiveUpdate selftest - A series that renames "KHO scratch" to "KHO bootmem" because this memory is way more important in kexec'ed kernels rather than in the original cold boot kernel and the new name reflects it * tag 'liveupdate-v7.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux: kho: do not reserve empty per-node bootmem areas selftests/liveupdate: Prefer KVM and HVF over TCG in vmtest.sh kho: rename kho_scratch= commandline parameter to kho_bootmem= kho: rename KHO scratch to KHO bootmem memblock: rename KHO_SCRATCH to KHO_NOPRSRV memblock: get rid of CONFIG_MEMBLOCK_KHO_SCRATCH kho: docs: fix scratch_phys debugfs cross-reference kho: do not reserve scratch memory in the kdump kernel |
||
|
Lorenzo Stoakes (ARM)
|
c911e7ebeb |
mm: rename is_vm_hugetlb_page() to vma_is_hugetlb()
The is_vm_hugetlb_page() predicate is badly named - the mapping can span more than a page and it is inconsistent with other VMA predicates that typically are prefixed by vma_. Rename to vma_is_hugetlb() for consistency, and while we're here update some VM_BUG_ON_VMA() to VM_WARN_ON_ONCE_VMA() as to avoid unnecessary oopses. No functional change intended. Link: https://lore.kernel.org/20261013-b4-mmap-prepare-vma-flag-sanify-v6-28-1aa3c9b139f9@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Marc Zyngier <maz@kernel.org> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Anup Patel <anup@brainfault.org> Acked-by: Zi Yan <ziy@nvidia.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Liam R. Howlett <liam@infradead.org> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Jann Horn <jannh@google.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Leon Romanovsky <leon@kernel.org> Cc: Paul Moore <paul@paul-moore.com> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Eduard Zingerman <eddyz87@gmail.com> Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Nico Pache <nico.pache@linux.dev> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Dev Jain <dev.jain@arm.com> Cc: Barry Song <baohua@kernel.org> Cc: Lance Yang <lance.yang@linux.dev> Cc: Usama Arif <usama.arif@linux.dev> Cc: Kiryl Shutsemau <kas@kernel.org> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: James Bottomley <james.bottomley@hansenpartnership.com> Cc: Martin K. Petersen <mkp@kernel.org> Cc: Simona Vetter <simona@ffwll.ch> Cc: Helge Deller <deller@gmx.de> Cc: Sebastian Reichel <sre@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Peter Xu <peterx@redhat.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Rik van Riel <riel@surriel.com> Cc: Harry Yoo <harry@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@gmail.com> Cc: Will Deacon <will@kernel.org> Cc: Aneesh Kumar K.V <aneesh.kumar@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Muchun Song <muchun.song@linux.dev> Cc: Oscar Salvador <osalvador@suse.de> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Jan Kara <jack@suse.cz> Cc: Oliver Upton <oupton@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Paul Walmsley <pjw@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Janosch Frank <frankja@linux.ibm.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Joshua Hahn <joshua.hahnjy@gmail.com> Cc: Rakie Kim <rakie.kim@sk.com> Cc: Byungchul Park <byungchul@sk.com> Cc: Gregory Price <gourry@gourry.net> Cc: Ying Huang <ying.huang@linux.alibaba.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Chris Li <chrisl@kernel.org> Cc: Kairui Song <kasong@tencent.com> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Baoquan He <baoquan.he@linux.dev> Cc: Youngjun Park <youngjun.park@lge.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Qi Zheng <qi.zheng@linux.dev> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Yuanchu Xie <yuanchu@google.com> Cc: Wei Xu <weixugc@google.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Michal Hocko <mhocko@kernel.org> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Xu Xin <xu.xin@linux.dev> Cc: Ihor Solodrai <ihor.solodrai@linux.dev> Cc: Bert Karwatzki <spasswolf@web.de> |
||
|
Lorenzo Stoakes (ARM)
|
94c8656453 |
mm: remove hugetlb_inline.h
This header really makes little sense - every place it is included mm.h is also included, and the header itself includes mm.h, so it does nothing to reduce header size. It also oddly does an #ifdef around checking VMA_HUGETLB_BIT, however VMA_HUGETLB_BIT is unconditionally available, and will never be set if hugetlb is not enabled. Simply remove the header, eliminate the odd ifdeffery and place the predicates in mm.h. The naming of these predicates is odd, but to keep changes separate, we will address this in a separate patch. The file was never put into MAINTAINERS so there's no change required there. No functional change intended. Link: https://lore.kernel.org/20261013-b4-mmap-prepare-vma-flag-sanify-v6-27-1aa3c9b139f9@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Zi Yan <ziy@nvidia.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Liam R. Howlett <liam@infradead.org> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Jann Horn <jannh@google.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Leon Romanovsky <leon@kernel.org> Cc: Paul Moore <paul@paul-moore.com> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Eduard Zingerman <eddyz87@gmail.com> Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Nico Pache <nico.pache@linux.dev> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Dev Jain <dev.jain@arm.com> Cc: Barry Song <baohua@kernel.org> Cc: Lance Yang <lance.yang@linux.dev> Cc: Usama Arif <usama.arif@linux.dev> Cc: Kiryl Shutsemau <kas@kernel.org> Cc: Doug Gilbert <dgilbert@interlog.com> Cc: James Bottomley <james.bottomley@hansenpartnership.com> Cc: Martin K. Petersen <mkp@kernel.org> Cc: Simona Vetter <simona@ffwll.ch> Cc: Helge Deller <deller@gmx.de> Cc: Sebastian Reichel <sre@kernel.org> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Peter Xu <peterx@redhat.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Rik van Riel <riel@surriel.com> Cc: Harry Yoo <harry@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: David Airlie <airlied@gmail.com> Cc: Will Deacon <will@kernel.org> Cc: Aneesh Kumar K.V <aneesh.kumar@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Muchun Song <muchun.song@linux.dev> Cc: Oscar Salvador <osalvador@suse.de> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Jan Kara <jack@suse.cz> Cc: Marc Zyngier <maz@kernel.org> Cc: Oliver Upton <oupton@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Anup Patel <anup@brainfault.org> Cc: Paul Walmsley <pjw@kernel.org> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Janosch Frank <frankja@linux.ibm.com> Cc: Claudio Imbrenda <imbrenda@linux.ibm.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Joshua Hahn <joshua.hahnjy@gmail.com> Cc: Rakie Kim <rakie.kim@sk.com> Cc: Byungchul Park <byungchul@sk.com> Cc: Gregory Price <gourry@gourry.net> Cc: Ying Huang <ying.huang@linux.alibaba.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Chris Li <chrisl@kernel.org> Cc: Kairui Song <kasong@tencent.com> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Baoquan He <baoquan.he@linux.dev> Cc: Youngjun Park <youngjun.park@lge.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Qi Zheng <qi.zheng@linux.dev> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Yuanchu Xie <yuanchu@google.com> Cc: Wei Xu <weixugc@google.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Michal Hocko <mhocko@kernel.org> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Xu Xin <xu.xin@linux.dev> Cc: Ihor Solodrai <ihor.solodrai@linux.dev> Cc: Bert Karwatzki <spasswolf@web.de> |
||
|
Linus Torvalds
|
4da9dedf3f |
IOMMU updates for v7.4:
- Core:
- Detect scatterlist length overflows and finalize deferred domain
attachments before mapping MSI pages.
- Consolidate x86 MSI reserved-region handling and clean up internal DMA
and SVA helpers.
- AMD IOMMU:
- Add IOMMU PerfOpt support, enabled by amdgpu for supported integrated
GPUs in identity domains.
- Restrict forced identity mapping to GPUs that require it.
- Fix kdump device-table allocation and reuse, ATS configuration error
handling, and an interrupt-remapping allocation leak.
- Clean up device probing and initialization.
- Add Vasant Hegde as an AMD IOMMU maintainer.
- ARM SMMUv2:
- Device-tree binding updates for Qualcomm Maili and Nord SoCs.
- ARM SMMUv3:
- Work around hardware integration issue on Google Tensor G5 SoCs where all
DMA transactions appear as instruction fetches.
- Allow command queue size to be configured on the kernel command-line.
- Reduce queue sizes when running as a kdump kernel.
- Fix some pre-existing issues in the driver and kunit tests reported by
Sashiko.
- Fix handling of Arm hardware errata relating to the contiguous hint
when using SVA.
- Rework the TLB invalidation logic in preparation for enabling iommu-pt in
future.
- Minor cleanups in preparation for improving support for kdump.
- Apple DART:
- Support device-tree DMA aperture specifications.
- Broadcom:
- Add BCM2712 IOMMU support for Raspberry Pi 5 display and multimedia
devices, including the generic page-table format and shared TLB cache
management.
- Hyper-V:
- Add a para-virtualized guest IOMMU driver with guest-managed stage-1 page
tables and page-selective IOTLB invalidation.
- Intel VT-d:
- Enhanced IQE fault handling for batched multiple descriptors,
- Optimization of page-table level calculation in compute_vasz_lg2_ss(),
- Fixes for several pre-existing issues reported by Sashiko,
- General cleanup and refinement.
- RISC-V:
- Report cache-coherency capability for coherent devices, enabling
VFIO/iommufd use.
- Samsung Exynos:
- Support SysMMUs without BLOCK mode, fixing their enable sequence and TLB
invalidation.
- Improve v7 fault diagnostics with transaction information.
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Merge tag 'iommu-updates-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux
Pull IOMMU updates from Joerg Roedel:
"Core:
- Detect scatterlist length overflows and finalize deferred domain
attachments before mapping MSI pages
- Consolidate x86 MSI reserved-region handling and clean up internal
DMA and SVA helpers
AMD IOMMU:
- Add IOMMU PerfOpt support, enabled by amdgpu for supported
integrated GPUs in identity domains
- Restrict forced identity mapping to GPUs that require it
- Fix kdump device-table allocation and reuse, ATS configuration
error handling, and an interrupt-remapping allocation leak
- Clean up device probing and initialization
- Add Vasant Hegde as an AMD IOMMU maintainer
ARM SMMUv2:
- Device-tree binding updates for Qualcomm Maili and Nord SoCs
ARM SMMUv3:
- Work around hardware integration issue on Google Tensor G5 SoCs
where all DMA transactions appear as instruction fetches
- Allow command queue size to be configured on the kernel
command-line
- Reduce queue sizes when running as a kdump kernel
- Fix some pre-existing issues in the driver and kunit tests reported
by Sashiko
- Fix handling of Arm hardware errata relating to the contiguous hint
when using SVA
- Rework the TLB invalidation logic in preparation for enabling
iommu-pt in future
- Minor cleanups in preparation for improving support for kdump
Apple DART:
- Support device-tree DMA aperture specifications
Broadcom:
- Add BCM2712 IOMMU support for Raspberry Pi 5 display and multimedia
devices, including the generic page-table format and shared TLB
cache management
Hyper-V:
- Add a para-virtualized guest IOMMU driver with guest-managed
stage-1 page tables and page-selective IOTLB invalidation
Intel VT-d:
- Enhanced IQE fault handling for batched multiple descriptors,
- Optimization of page-table level calculation in
compute_vasz_lg2_ss(),
- Fixes for several pre-existing issues reported by Sashiko,
- General cleanup and refinement
RISC-V:
- Report cache-coherency capability for coherent devices, enabling
VFIO/iommufd use
Samsung Exynos:
- Support SysMMUs without BLOCK mode, fixing their enable sequence
and TLB invalidation
- Improve v7 fault diagnostics with transaction information"
* tag 'iommu-updates-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux: (69 commits)
MAINTAINERS: Make Vasant Hegde AMD IOMMU maintainer
iommu/hyperv: Make hv_iommu_device static
iommu/hyperv: Add missing PCI dependency for the guest IOMMU driver
iommu/amd: Don't allocate kdump device table from DMA32
iommu/amd: Program device table when kdump reuse fails
iommu/dma: Clean up redundant MSI cookie check
iommu/dma: Catch scatterlist length overflows
iommu/hyperv: Add page-selective IOTLB flush support
iommu/hyperv: Add para-virtualized IOMMU support for Hyper-V guest
iommu/x86: Add architectural MSI reserved region helper
Drivers: hv: Add logical device ID registry for vPCI devices
hyperv: Introduce new hypercall interfaces used by Hyper-V guest IOMMU
iommu: Make iommu-dma helpers private
iommu/arm-smmu-v3: Don't rb_erase() a never-inserted stream node
iommu/arm-smmu-v3: Add Q_POS() macro
iommu/arm-smmu-v3: Add arm_smmu_attach_release()
iommu/arm-smmu-v3: Disable the impl before disabling the SMMU on shutdown
iommu/arm-smmu-v3: Populate the tlbi at the top of the call chain
iommu/arm-smmu-v3: Precompute the invalidation commands
iommu/arm-smmu-v3: Keep track in arm_smmu_invs if range invalidation is used
...
|
||
|
Linus Torvalds
|
55fbedcec6 |
bpf-next-7.4
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Merge tag 'bpf-next-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Pull bpf updates from Alexei Starovoitov:
"Major changes:
- Introduce scalar evolution (SCEV) analysis in the verifier.
It infers how registers and stack slots change in a loop and lets
the verifier check bounded loops with induction variables as ranges
instead of walking every iteration. The number of processed insns
drops ten fold in programs with loops (Eduard Zingerman)
- Add 'callx' instruction: indirect call of a static BPF subprogram.
The address is taken with ld_imm64 or loaded from read-only data.
Supported by x86-64, arm64 and riscv64 JITs (Alexei Starovoitov, Pu
Lehui)
- Add unwind_goto and unwind_exit instructions, so that Rust panic or
C++ exception can run destructors of every frame it passes through.
The normal path is free of unwind code. Supported by x86-64 and
arm64 JITs (Alexei Starovoitov)
- Support programs compiled by rust-bpf: treat load and store through
a number as arena access with BPF_F_ARENA_SCALAR, accept rust names
in BTF (Alexei Starovoitov)
- Raise BPF program stack size from 512 bytes to 2 KiB on x86-64 and
arm64 (Kumar Kartikeya Dwivedi)
- Support struct, union and __int128 up to 16 bytes passed and
returned by value in BPF subprograms and kfuncs, and fix x86-64 and
arm64 trampolines for such arguments (Yonghong Song)
- Introduce a common way to attach struct_ops to a cgroup via
bpf_link. bpf_tcp_ops is the first user and mirrors TCP sock_ops
callbacks (Martin KaFai Lau, Amery Hung)
- Describe inlined functions in BTF. New kinds tell where the inline
sites are and how to fetch the arguments there.
CONFIG_DEBUG_INFO_BTF_INLINE keeps it apart from the main BTF in
.BTF.inline section or in btf_vmlinux_inline.ko (Alan Maguire)
- Fix many memory safety, lifetime and locking bugs in BPF core,
verifier, iterators, local storage, dynptr, devmap, cpumap and
seg6local (Josef Bacik, Alexei Starovoitov)
- Diff stat is dominated by selftests and by removal of
lib/test_bpf.c. Its 16k lines of instruction tests were converted
to BPF selftests that BPF CI runs on every architecture it covers
(Daniel Borkmann)
Other features and fixes:
- Add KASAN checks to memory accesses of JITed programs on x86-64
(Alexis Lothoré)
- Complete unification of helper, kfunc and subprog argument checks
in the verifier (Amery Hung)
- Add bpf_copy_from_user_mm[_str]() kfuncs (Anastasios Papagiannis)
- Various features and fixes (Daniel Borkmann):
- Add .bpf keyring for program signature verification, modelled
after dm-verity keyring, and support ML-DSA in signing tools
- Emit shorter and faster code in x86-64 JIT for patterns that
LLVM generates
- Fix various issues in gotox handling
- Let BPF LSM set xattrs at inode creation with bpf_inode_init_xattr()
(David Windsor, Daniel Borkmann)
- Use sleepable page allocation in sleepable arena paths. Fix races
between arena free, allocation and user page fault (Emil Tsalapatis)
- Switch BPF crypto from lskcipher to AES-CBC and AES-ECB libraries
(Eric Biggers)
- Add bpf_proactive_reclaim() kfunc (Hui Zhu)
- Render decl_tags in libbpf btf_dump and add tests for bpftool C
dump (Ihor Solodrai)
- Speed up tracing_multi attach on x86 (Jiri Olsa)
- Various features and fixes (Kumar Kartikeya Dwivedi):
- Add BPF_PROG_STREAM_OPEN command to read BPF streams through a
file descriptor with poll support
- Let kernel structs publish arena pointers with __arena type tag
- Fix __uninit kfunc output buffers and fastcall rewrite with
indirect stack accesses
- Refuse CO-RE relocations for signed programs
- Add enqueue_rcvq and dequeue_rcvq hooks to bpf_tcp_ops to adjust
sk_rcvlowat and avoid unnecessary wakeups (Kuniyuki Iwashima)
- Add bpf_ksock_sendto() kfunc and allow ksock connect and send from
bpf_wq (Mahe Tardy)
- Fix racy plt target update in arm64 bpf_arch_text_poke()
(Matthew Wood)
- Restructure BPF selftests Makefile as a layered build
(Mykola Lysenko)
- Speed up hash map lookups for u32 and u64 keys (Mykyta Yatsenko)
- Add signed div/mod, movsx, bswap and gotol to MIPS JITs, signed
div/mod to parisc JITs (Nicholas Dudar, Johan Almbladh)
- Fix stack overflow in build ID parser on 32-bit (Nickolai
Zeldovich)
- Add stack arguments, signed arena loads and gotox to riscv64 JIT.
Pu Lehui is now co-maintainer of riscv BPF JITs (Pu Lehui, Chen
Pei, Feng Jiang)
- Add bpf_call_rcu() and bpf_call_rcu_tasks_trace() kfuncs. Support
fetching and/or/xor atomics in arena on x86-64 (Puranjay Mohan)
- Fix flaky selftests, selftests with clang 23 and bpf-gcc
(Qiliang Yuan, KaFai Wan, Vineet Gupta)
- Fix builds broken by fatal resolve_btfids warnings, BTF generation
on ARC, and define arch_cmpxchg_local() on arc, hexagon and
openrisc (Sasha Levin)
- Reduce memory use of hash maps by up to 50% per element
(T.J. Mercier)
- Mark pointer fields of sched_ext ops arguments as trusted (Tejun
Heo)
- Remove legacy bpf_asm, bpf_dbg and bpf_jit_disasm tools (Xia Yan)
- Fix index overflow in queue and stack maps, arena range tree after
allocation failure, tail call loop after freplace detach, lost
signal in bpf_send_signal() (Yuan Chen)
- Many more fixes and cleanups"
* tag 'bpf-next-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (660 commits)
selftests/bpf: Time tc_edt from its first packet with data
selftests/bpf: Test unwind_exit of an exception callback
selftests/bpf: Tests for 32-bit scalar evolution bounds computation
bpf: Reject unwind_goto and unwind_exit in offloaded progs
bpf: Support 32-bit linear scalar evolution
bpf: Make unwind_exit of an exception callback exit in JITs
selftests/bpf: Test forbidden bpf_ksock_sendto() LSM attach
selftests/bpf: Test ksock sendto()
bpf: Add bpf_ksock_sendto() kfunc
selftests/bpf: Test unwinding from R0: R2 subprog
selftests/bpf: Add a C++ prog with exceptions
selftests/bpf: Add tests for unwind_goto and unwind_exit
bpf, arm64: Support unwind_goto and unwind_exit
bpf, x86: Support unwind_goto and unwind_exit
bpf: Add unwind_goto and unwind_exit insns
tools/bpf: Remove legacy BPF tools
bpf: Annotate data races on bpf_lru_node type
selftests/bpf: Add arena allocation race tests
bpf: Fix arena race between page free and alloc leading to incoherency
bpf: Revalidate faulted arena pages before installing user mappings
...
|
||
|
Linus Torvalds
|
c5fd5e67c7 |
mm.git review status for linus..mm-stable
Everything:
Total patches: 539
Fixes: tags: 101
cc:stable patches: 67
Reviews/patch: 1.62
Reviewed rate: 76%
Excluding DAMON:
Total patches: 407
Fixes: tags: 84
cc:stable patches: 44
Reviews/patch: 2.00
Reviewed rate: 87%
Excluding DAMON and selftests:
Total patches: 360
Fixes: tags: 78
cc:stable patches: 44
Reviews/patch: 2.02
Reviewed rate: 89%
Summary of patch series in this merge, ordered by descending size:
- "selftests/mm: improve khugepaged coverage" (Kiryl Shutsemau (Meta)):
Give khugepaged a proper workout. Extend the tests to all supported mTHP
orders, check exactly which windows collapsed, and make scan completion
deterministic. Race collapse against faults, pinning, fork and remap;
verify that the contents survive.
Add coverage for whole-page-table zaps and memory pressure too.
- "selftests/mm: separate GUP microbenchmarking from functional testing"
(Sarthak Sharma):
Untangle GUP benchmarking from correctness testing. Move the benchmark
into tools/mm, add a standalone harness-based GUP selftest, and move shared
helpers into tools/lib/mm. Give each tool one job instead of mixing timing
measurements with correctness checks.
Cover the mapping, pinning and batch-size combinations explicitly.
- "mm: Switch device DAX to section-based vmemmap optimization" (Muchun Song):
Apply section-based vmemmap optimization to device DAX. Rework the backing
metadata layout to save memory while preserving the handling of device
memory hotplug and its different alignment and lifetime requirements.
- "mm: Introduce section-based vmemmap optimization for HugeTLB" (Muchun
Song):
Cut the memory consumed by HugeTLB's struct page array with section-based
vmemmap optimization. Arrange the metadata so large huge pages need fewer
backing pages, while keeping initialization, teardown and the various
hugepage configurations straight.
- "mm/huge_memory: clean up and decouple the anon and file split helpers"
(Kairui Song):
Separate anonymous and file-backed folio splitting, which have rather
different locking and bookkeeping requirements. Move the work into
separate helpers, drop dead checks and tidy swap-cache handling. Fix error
paths, including one that could leave a folio frozen.
Keep the swap cache cases separate from file-cache splitting.
- "mm: Unconditional per-VMA locks and cleanups" (Dave Hansen):
Make per-VMA locking unconditional and clean up the old conditional code
around it. This removes configuration-dependent plumbing and lets callers
depend on one locking model rather than carrying both cases along.
- "memcg: remove the v1 soft limit" (Shakeel Butt):
Remove the old cgroup v1 memory soft-limit machinery. This has long since
been superseded by the newer memory-control interfaces; hauling around a
separate reclaim scheme for it no longer buys us much.
- "read proc/pid/smaps_rollup under per-vma lock" (Suren Baghdasaryan):
Read /proc/PID/smaps_rollup using per-VMA locks where possible, rather than
holding mmap_lock across the entire walk. Retain the contention fallback
and add tearing tests. This considerably reduces latency when another
thread is busy changing its mappings.
- "mm/damon: introduce data access-as-a-data attribute" (SJ Park):
Teach DAMON to expose memory access observations as data attributes, making
them available to the probe and filtering machinery. Extend the
interfaces, documentation and tests so the new information can be used
rather than merely collected.
- "Remove PG_private by using page/folio->private checks instead" (Zi Yan):
Get rid of PG_private and use the folio's private pointer to say whether
private data is attached. Convert the filesystem users, including erofs,
f2fs and md, and clean up the old accessors and flags. There are a few
special cases, notably swapcache and hugetlb, which need explicit care.
- "mm: make userland page table freeing RCU-safe" (Lorenzo Stoakes (ARM)):
Make freeing userspace page tables safe against RCU readers. Sort out the
page-table lifetime and locking rules so walkers cannot stumble over freed
tables while mappings are being torn down.
- "make unused huge shrinker memcg aware" (Qi Zheng):
Make shmem's unused-huge-folio shrinker aware of memory cgroups, so reclaim
can find those folios under the right memcg. Wire up the per-memcg
tracking and its lifetime rules, and give the shrinklist its own lockdep
class to avoid spurious dependency reports.
- "mm: Drop pxd_ERROR()" (Anshuman Khandual):
Remove the old pxd_ERROR() page-table checks and their
architecture-specific baggage. Simplify the common page-table interfaces
and callers now that these checks no longer serve a useful purpose.
- "memcg: group struct fields by access pattern" (Shakeel Butt):
Rearrange memcg's hot and cold fields according to how they're actually
accessed. Keep frequently updated counters and their neighboring state
from fighting over cachelines and reduce needless cacheline traffic.
- "mm/damon/core: fix the size charged for a filter-trimmed region" (Donggeun
Yoo):
Fix DAMOS quota accounting when a filter trims a monitoring region. Charge
only the part left after filtering, not the original region, and add KUnit
coverage. Previously the excluded memory could eat into the quota and make
schemes run more slowly than requested.
- "mm/damon: add kunit and selftests for probes and probe weights" (SJ Park):
Add more tests for DAMON probes and their weights, including validation and
the results reported to userspace. This is mostly about catching
regressions in the newer probe infrastructure before they become harder to
diagnose.
- "mm: memcontrol: constify the read side of the read side of the memcg API"
(Tal Zussman):
Mark the read-only parts of the memcg interface const, from folio and
lruvec accessors to counters and swap helpers. Most of this is mechanical,
but it makes the contracts clearer and lets the compiler catch accidental
writes.
- "mm/damon/vaddr: support {prep,apply}_probes" (SJ Park):
Support the new prepare/apply probe operations in DAMON's virtual-address
backend. This brings vaddr monitoring into line with the probe
infrastructure and makes the added probe types useful there too.
- "mm/mglru: clean up folio counters and flag usage" (Kairui Song):
Simplify MGLRU's folio counters and flag handling. Remove redundant
accounting paths and make the state transitions easier to follow without
changing the intended reclaim policy.
- "arch, mm/execmem: resolve confusion about set_direct_map_valid_noflush()"
(Mike Rapoport (Microsoft)):
Clarify and straighten out the set_direct_map_valid_noflush() interface
across architectures and execmem. Make the requested mapping changes and
the callers' expectations agree, rather than relying on subtly different
architecture behavior.
- "mm: zswap: free cold writeback folios promptly" (Alexandre Ghiti):
Free zswap writeback folios as soon as their disk write completes. They
are cold temporary buffers, so putting them on the LRU only makes reclaim
rediscover them later. Extend swap-cache dropbehind and let zswap keep
these folios off the LRU altogether.
- "mm: gup: cleanup gup_fast call chain" (Aristeu Rozanski):
Clean up the GUP-fast call chain and simplify how the fast-path helpers
pass their arguments and results around. Keep the page-pin behavior the
same while making the call sequence easier to maintain.
- "mm: optimize zone-device memmap initialization" (Li Zhe):
Speed up initialization of zone-device struct pages. Avoid redundant work
when setting up large device-memory ranges, where touching every descriptor
can get expensive.
- "mm/zswap: shrink zswap_entry via a pool id" (Jianyue Wu):
Reduce the size of zswap_entry by storing a compact pool identifier instead
of a full pointer. Keep the pool lookup and lifetime handling correct
while saving per-entry metadata.
- "mm/damon: support access monitoring of hugetlb-backed memory" (Krishna
Iyer):
Let DAMON monitor hugetlb-backed memory too. Extend the relevant access
checks and add coverage so those mappings no longer fall through a hole in
the monitoring machinery.
- "mm/execmem: fixes and cleanups for the ROX cache" (Mike Rapoport
(Microsoft)):
Tidy execmem's read-only-executable cache and fix its handling of the
awkward allocation and release cases. The aim is to make the cache's
ownership and permission transitions more predictable.
- "zsmallc: remove old object read API" (Sergey Senozhatsky):
Drop zsmalloc's old object-read API and move its remaining users to the
supported access mechanism. This removes a duplicate interface which we no
longer need.
- "mm/mempolicy: stop copying state in the interleave paths" (Gregory Price):
Stop copying mempolicy state in the interleave paths when a reference to
the existing policy will do. This avoids extra work and makes the
ownership rules less obscure.
- "mm/mglru: speed up inc_min_seq() and fix cold/hot inversions" (Barry Song
(Xiaomi)):
Make MGLRU's generation advancement cheaper and fix cases where cold and
hot folios end up in the wrong order. Adjust the counter and list handling
so reclaim doesn't keep passing over the better eviction candidates.
- "mm: Fix MF_DELAYED handling on memory failure" (Lisa Wang):
Treat MF_DELAYED as a partially completed memory-failure operation, not an
outright failure. Propagate that result correctly through shmem and the
generic handler, fix the extra-reference accounting, and add tests for the
resulting SIGBUS behavior.
- "tools/mm/page_owner_sort: fix --sort, add module filter, improve usage" (Ye
Liu):
Fix page_owner_sort's --sort handling, add module-based filtering and make
the usage output more helpful. This makes the tool less frustrating when
tracking down who is holding on to pages.
- "mm/damon: move damos filter range arguments validation to core" (SJ Park):
Move DAMOS filter range validation into the core, where all callers can
share it. Also close the sysfs read-twice races which could pass
inconsistent ranges, and add tests for invalid input.
- "mm/damon: misc cleanups" (Zenghui Yu (Huawei)):
Clean up a collection of small DAMON rough edges in the core, interfaces
and tests. No large behavior change here, just simpler code and fewer
opportunities for confusion.
- "mm/damon: cleanup code, add test cases, and update guidances in docs" (SJ
Park):
Clean up DAMON's core and interfaces, add missing test cases and bring the
documentation into line with the code. These changes should make the newer
facilities easier to understand and maintain.
- "mm/damon: introduce hugepage_size probe filter" (SJ Park):
Add a DAMON probe filter for hugepage size. Let users select a range of
folio sizes through sysfs, validate the range and document the new
interface, so monitoring can concentrate on memory backed by the desired
hugepage sizes.
- "selftests/mm: pagemap_ioctl test fixes and cleanups" (Zenghui Yu (Huawei)):
Fix some pagemap ioctl test assumptions and clean up their setup and
reporting. Make failures point to the operation that went wrong rather
than to test harness bookkeeping.
- "mm: avoid large folio splits when swap is unavailable" (Johannes Weiner):
Avoid splitting large folios merely to attempt swap when no swap space is
available. There is little point paying for an expensive split when
reclaim cannot actually swap the resulting pages out.
- "mm: workingset: fix the shadow node budget under MGLRU" (Hui Zhu):
Fix the workingset shadow-node budget with MGLRU enabled. Keep the shadow
entries within the intended limits so refault tracking does not quietly
consume more metadata than it should.
- "selftests/mm: TAP output and global-state fixes" (Song Hu):
Fix selftests which produce misleading TAP output or fail to restore global
settings after a run. A test ought to leave the system as it found it,
particularly when a whole suite follows behind.
- "mm: remove page_swap_entry()" (Tal Zussman):
Remove page_swap_entry() and convert its remaining users to the folio and
swap-entry helpers. Lose an old page-level interface and make the swap
paths a little more consistent.
- "mm: refactor zonelist constructors and iterators" (Gregory Price):
Refactor the zonelist construction and walk helpers to reduce duplicated
logic. Keep the allocation ordering rules intact while making it clearer
how zones are selected.
- "mm: kmemleak: batch the struct page scan" (Breno Leitao):
Scan adjacent struct pages in batches instead of taking kmemleak_lock once
for every single page. This preserves scan coverage and the lock-hold
bound, while cutting overhead substantially on debug kernels.
- "mm/damon: misc improvements in tests and documents" (Zenghui Yu (Huawei)):
Fix some DAMON selftests which leave kdamond running or fail under Python
safe-path mode, and improve the KUnit coverage and documentation. Nothing
especially glamorous, but these are worth doing.
- "mm/damon: introduce probe_hits_wsum DAMOS core filter" (SJ Park):
Add a DAMOS core filter using weighted probe-hit counts. This gives
schemes another way to select regions based on what the monitoring probes
observed.
- "mm/mglru: fix ineffective memory protection for non-kswapd reclaim" (Ridong
Chen):
Fix MGLRU's memory protection handling for reclaim outside kswapd. The
protection settings weren't having the intended effect in these paths,
leaving protected memory more exposed than requested.
- "mm/damon: improve readability, clarity and test coverage" (SJ Park):
Simplify a handful of DAMON core helpers, clarify their behavior and expand
test coverage. There are no intended userspace-visible changes in this
batch.
- "mm: replace PF_KCOMPACTD/PF_KSWAPD with kthread_func()" (Kefeng Wang):
Stop identifying reclaim and compaction workers through the PF_KSWAPD and
PF_KCOMPACTD task flags. Use their kthread functions instead and remove
the redundant flag plumbing.
- "mm/hugetlb: fix surplus accounting and availability checks during demotion"
(Longlong Xia):
Fix HugeTLB surplus accounting and availability checks when demoting huge
pages. Keep the counters and reservation decisions consistent as one huge
page turns into several smaller ones.
- "mm/damon: add kunit tests for probe_hits handling and probe params
validation" (Jason Angelov):
Add KUnit tests for DAMON probe-hit handling and invalid probe parameters.
These cover edge cases that were too easy to miss in ordinary monitoring
tests.
- "mm/damon: fix misc bugs in kunit, quota goals and sysfs refresh_ms" (SJ
Park):
Fix a few DAMON bugs in KUnit tests, quota-goal handling and the sysfs
refresh interval. Small fixes, but the incorrect results and control
behavior were real.
- "mm: zswap: optimize zswap invalidate and store" (Kefeng Wang):
Simplify zswap's invalidate and store paths to avoid avoidable lookups and
work. Keep the entry lifetime rules intact while making those frequent
operations cheaper.
- "mm: replace custom ratelimiting logic" (Pedro Falcato):
Replace hand-rolled MM rate limiting with the common kernel helpers. There
is no need to maintain another local version of the same mechanism.
- "mm/vmalloc: minor cleanups" (Ye Liu):
Tidy some vmalloc initialization and reporting code, and pull duplicated
vmap-area insertion work into a helper. No functional changes are
intended.
- "mm/mglru: clean up isolate_folios for readability and clarity" (Ridong
Chen):
Clean up MGLRU's isolate_folios() so the decisions are easier to read and
verify. Keep reclaim behavior unchanged while removing unnecessary twists
in the control flow.
- "Catch automatic storage in IDA and Maple Tree definitions" (Yury Norov):
Catch IDA and maple-tree definitions placed in automatic storage where the
lifetime rules are wrong or easy to get wrong. Add checks so such mistakes
are harder to slip through unnoticed.
- "mm, swap: some random fixes and cleanups" (Kemeng Shi):
Fix and simplify a few unrelated swap paths, removing redundant work and
tidying up error handling. A small collection of things which were better
fixed than left lying around.
- "mm/page_io: folio conversion cleanups" (Tal Zussman):
Finish some page-to-folio conversions in swap I/O, removing obsolete
wrappers and using folio operations consistently. The I/O behavior is
intended to remain the same.
- "mm/swap: skip empty clusters in the swapoff scan" (Youngjun Park):
Skip empty swap clusters during swapoff instead of walking slots which have
nothing to release. This avoids pointless work on sparsely used swap
devices.
- "mm: trace: decode architecture-specific VMA flags" (Meijing Zhao):
Teach the VMA trace output to decode architecture-specific flags, rather
than leaving them as unexplained bits. That should make tracing a good
deal more useful when debugging unusual mappings.
- "mm, swap: don't spin on a bad swap entry" (Breno Leitao):
Stop repeatedly retrying a swap entry which is already known to be bad.
Make the error path terminate cleanly instead of wasting CPU chasing an
entry that cannot be used.
- "mm/page_isolation: fix UBSAN shift-out-of-bounds in
isolate_single_pageblock" (Qi Xi):
Fix an out-of-range shift in isolate_single_pageblock() and tighten its
associated boundary handling. UBSAN found the issue; the result should be
more robust pageblock isolation.
- "mm: khugepaged: fix tracepoint UAF" (Vernon Yang):
Fix a use-after-free in khugepaged tracepoint handling. Make sure the
information recorded by tracing stays valid for as long as the trace event
needs it.
- "mm/damon: fix DAMOS bugs in core, paddr and vaddr" (SJ Park):
Fix several DAMOS problems across the core and physical- and
virtual-address backends. The changes close error cases and bring the
implementations back into agreement.
- "mm/hugetlb_cgroup: move the per-node usage along with the folio" (Hongfu
Li):
Move HugeTLB per-node usage accounting when folios migrate between nodes or
are reparented to another cgroup. Otherwise numa_stat can retain stale
charges and even underflow when the folio is freed.
- "docs/core-api: memory-allocation: add k[mz]alloc_obj() and clarify kmalloc"
(Mike Rapoport (Microsoft)):
Document the typed k[mz]alloc_obj() allocation helpers and clear up some
kmalloc guidance. Make it easier for callers to choose the right
interface.
- "selftests/mm: Validate selections and scope memfd_secret setup" (Tianyi
Chen):
Check selftest selections before running and confine memfd_secret setup to
the cases that actually need it. Avoid confusing failures caused by the
test harness itself.
- "mm/damon: move zero damos quota target_value handling to the core layer"
(SJ Park):
Handle a zero DAMOS quota goal target in the core rather than making each
user of the interface invent its own rule. Keep quota decisions consistent
across callers.
- "mm/damon: Introduce a huge page collapsing mechanism using auto tuning"
(Asier Gutierrez):
Add an auto-tuned DAMON mechanism for collapsing huge pages. Use
monitoring feedback to decide when collapse is worthwhile rather than
forcing one fixed policy onto every workload.
- "kmemleak: fix stale documentation and raise the verbose default" (Breno
Leitao):
Bring the kmemleak documentation up to date and require a third confirming
scan before verbose kernels print a suspected leak. The extra scan helps
suppress transient false positives in noisy debug builds.
- "mm/memory: improve insert_pages() error handling" (Avi Weiss):
Tighten insert_pages() error handling so partial failures are reported and
cleaned up consistently. The caller should not have to guess how far the
operation got.
- "mm/damon: allow NULL or unstarted damon_ctx parameter for damon_call()" (SJ
Park):
Make damon_call() handle NULL and not-yet-started contexts safely.
Simplify the rules for callers and avoid an indefinite wait on an invalid
state.
- "mm/damon: introduce pgidle_set probe filter type" (SJ Park):
Add a pgidle_set DAMON probe filter, giving monitoring users another way to
select pages by their idle-tracking state. Wire it through the filter
interfaces and tests.
- "mm/damon/core: remove unused helper functions" (Cheng-Han Wu):
Remove DAMON core helpers which no longer have callers. Keep the API
surface smaller rather than retaining dead code just in case.
- "mm: stop calling pmd_folio() on special PMDs" (Gregory Price):
Avoid calling pmd_folio() on special PMD mappings that have no struct page.
The old assumption could fault in procfs walkers; use the normal-folio
checks and handle those mappings properly.
- "mm: remove three unused helpers from mm.h" (Tal Zussman):
Remove three unused helpers from mm.h. Fewer obsolete interfaces for the
next person to stumble over.
- "mm/damon: improvements in efficiency, error handling, documents" (Liew Rui
Yan):
Skip needless DAMOS quota work once the quota is full, propagate a missing
sysfs error and tidy a couple of comments. The ignored error could make a
monitoring-start request appear successful when it wasn't.
- "docs/mm/damon/design: add explanation of nr_snapshots" (Liew Rui Yan):
Explain DAMON's nr_snapshots accounting in the design documentation and
straighten out the associated terminology. Make it clearer what users
should expect from that counter.
- "selftests/cgroup: fixes for test_zswap on single core VM" (Wilson Felipe
Pereira):
Fix two test_zswap failures on single-CPU VMs. Wait for the exiting
child's cgroup to become unpopulated before reconfiguring it, and avoid
another test assumption which breaks under constrained scheduling.
- "docs/ksm: fix advisor documentation and comment" (Jinjiang Tu):
Correct the KSM advisor documentation and a misleading code comment. Keep
the description aligned with how the advisor actually works.
- "Fix bugs in HugeTLB allocation when mem_cgroup_charge_hugetlb() fails"
(Ackerley Tng):
Fix HugeTLB allocation cleanup when the memcg charge fails. Make sure
failure exits undo what was allocated rather than leaving stale accounting
or resources behind.
- "mm, memcg: fix memory.peak reset clobbering other fds' watermark" (Ridong
Chen):
Fix memory.peak reset handling so resetting one file descriptor doesn't
overwrite the watermark kept for another. Keep those per-open measurements
independent as intended.
- "mm: reject zone device folios in more folio walkers" (Gregory Price):
Reject zone-device folios in page walkers that cannot safely handle them.
Extend the existing checks rather than assuming every folio has ordinary
system-memory backing.
- "percpu: remove code with no effect" (Sang-Heon Jeon):
Remove a few pieces of percpu code which no longer do anything. There is
no reason to keep maintaining dead paths.
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Merge tag 'mm-stable-2026-10-19-21-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- "selftests/mm: improve khugepaged coverage" (Kiryl Shutsemau):
Give khugepaged a proper workout. Extend the tests to all supported
mTHP orders, check exactly which windows collapsed, and make scan
completion deterministic. Race collapse against faults, pinning, fork
and remap; verify that the contents survive.
Add coverage for whole-page-table zaps and memory pressure too.
- "selftests/mm: separate GUP microbenchmarking from functional testing"
(Sarthak Sharma):
Untangle GUP benchmarking from correctness testing. Move the
benchmark into tools/mm, add a standalone harness-based GUP selftest,
and move shared helpers into tools/lib/mm. Give each tool one job
instead of mixing timing measurements with correctness checks.
Cover the mapping, pinning and batch-size combinations explicitly.
- "mm: Switch device DAX to section-based vmemmap optimization" (Muchun
Song):
Apply section-based vmemmap optimization to device DAX. Rework the
backing metadata layout to save memory while preserving the handling
of device memory hotplug and its different alignment and lifetime
requirements.
- "mm: Introduce section-based vmemmap optimization for HugeTLB"
(Muchun Song):
Cut the memory consumed by HugeTLB's struct page array with
section-based vmemmap optimization. Arrange the metadata so large
huge pages need fewer backing pages, while keeping initialization,
teardown and the various hugepage configurations straight.
- "mm/huge_memory: clean up and decouple the anon and file split
helpers" (Kairui Song):
Separate anonymous and file-backed folio splitting, which have rather
different locking and bookkeeping requirements. Move the work into
separate helpers, drop dead checks and tidy swap-cache handling. Fix
error paths, including one that could leave a folio frozen.
Keep the swap cache cases separate from file-cache splitting.
- "mm: Unconditional per-VMA locks and cleanups" (Dave Hansen):
Make per-VMA locking unconditional and clean up the old conditional
code around it. This removes configuration-dependent plumbing and
lets callers depend on one locking model rather than carrying both
cases along.
- "memcg: remove the v1 soft limit" (Shakeel Butt):
Remove the old cgroup v1 memory soft-limit machinery. This has long
since been superseded by the newer memory-control interfaces; hauling
around a separate reclaim scheme for it no longer buys us much.
- "read proc/pid/smaps_rollup under per-vma lock" (Suren Baghdasaryan):
Read /proc/PID/smaps_rollup using per-VMA locks where possible,
rather than holding mmap_lock across the entire walk. Retain the
contention fallback and add tearing tests. This considerably reduces
latency when another thread is busy changing its mappings.
- "mm/damon: introduce data access-as-a-data attribute" (SJ Park):
Teach DAMON to expose memory access observations as data attributes,
making them available to the probe and filtering machinery. Extend
the interfaces, documentation and tests so the new information can be
used rather than merely collected.
- "Remove PG_private by using page/folio->private checks instead" (Zi
Yan):
Get rid of PG_private and use the folio's private pointer to say
whether private data is attached. Convert the filesystem users,
including erofs, f2fs and md, and clean up the old accessors and
flags. There are a few special cases, notably swapcache and hugetlb,
which need explicit care.
- "mm: make userland page table freeing RCU-safe" (Lorenzo Stoakes):
Make freeing userspace page tables safe against RCU readers. Sort out
the page-table lifetime and locking rules so walkers cannot stumble
over freed tables while mappings are being torn down.
- "make unused huge shrinker memcg aware" (Qi Zheng):
Make shmem's unused-huge-folio shrinker aware of memory cgroups, so
reclaim can find those folios under the right memcg. Wire up the
per-memcg tracking and its lifetime rules, and give the shrinklist
its own lockdep class to avoid spurious dependency reports.
- "mm: Drop pxd_ERROR()" (Anshuman Khandual):
Remove the old pxd_ERROR() page-table checks and their
architecture-specific baggage. Simplify the common page-table
interfaces and callers now that these checks no longer serve a
useful purpose.
- "memcg: group struct fields by access pattern" (Shakeel Butt):
Rearrange memcg's hot and cold fields according to how they're
actually accessed. Keep frequently updated counters and their
neighboring state from fighting over cachelines and reduce needless
cacheline traffic.
- "mm/damon/core: fix the size charged for a filter-trimmed region"
(Donggeun Yoo):
Fix DAMOS quota accounting when a filter trims a monitoring region.
Charge only the part left after filtering, not the original region,
and add KUnit coverage. Previously the excluded memory could eat into
the quota and make schemes run more slowly than requested.
- "mm/damon: add kunit and selftests for probes and probe weights" (SJ
Park):
Add more tests for DAMON probes and their weights, including
validation and the results reported to userspace. This is mostly
about catching regressions in the newer probe infrastructure before
they become harder to diagnose.
- "mm: memcontrol: constify the read side of the read side of the memcg
API" (Tal Zussman):
Mark the read-only parts of the memcg interface const, from folio and
lruvec accessors to counters and swap helpers. Most of this is
mechanical, but it makes the contracts clearer and lets the compiler
catch accidental writes.
- "mm/damon/vaddr: support {prep,apply}_probes" (SJ Park):
Support the new prepare/apply probe operations in DAMON's
virtual-address backend. This brings vaddr monitoring into line with
the probe infrastructure and makes the added probe types useful there
too.
- "mm/mglru: clean up folio counters and flag usage" (Kairui Song):
Simplify MGLRU's folio counters and flag handling. Remove redundant
accounting paths and make the state transitions easier to follow
without changing the intended reclaim policy.
- "arch, mm/execmem: resolve confusion about set_direct_map_valid_noflush()"
(Mike Rapoport (Microsoft)):
Clarify and straighten out the set_direct_map_valid_noflush()
interface across architectures and execmem. Make the requested
mapping changes and the callers' expectations agree, rather than
relying on subtly different architecture behavior.
- "mm: zswap: free cold writeback folios promptly" (Alexandre Ghiti):
Free zswap writeback folios as soon as their disk write completes.
They are cold temporary buffers, so putting them on the LRU only
makes reclaim rediscover them later. Extend swap-cache dropbehind and
let zswap keep these folios off the LRU altogether.
- "mm: gup: cleanup gup_fast call chain" (Aristeu Rozanski):
Clean up the GUP-fast call chain and simplify how the fast-path
helpers pass their arguments and results around. Keep the page-pin
behavior the same while making the call sequence easier to maintain.
- "mm: optimize zone-device memmap initialization" (Li Zhe):
Speed up initialization of zone-device struct pages. Avoid redundant
work when setting up large device-memory ranges, where touching every
descriptor can get expensive.
- "mm/zswap: shrink zswap_entry via a pool id" (Jianyue Wu):
Reduce the size of zswap_entry by storing a compact pool identifier
instead of a full pointer. Keep the pool lookup and lifetime handling
correct while saving per-entry metadata.
- "mm/damon: support access monitoring of hugetlb-backed memory"
(Krishna Iyer):
Let DAMON monitor hugetlb-backed memory too. Extend the relevant
access checks and add coverage so those mappings no longer fall
through a hole in the monitoring machinery.
- "mm/execmem: fixes and cleanups for the ROX cache" (Mike Rapoport):
Tidy execmem's read-only-executable cache and fix its handling of the
awkward allocation and release cases. The aim is to make the cache's
ownership and permission transitions more predictable.
- "zsmallc: remove old object read API" (Sergey Senozhatsky):
Drop zsmalloc's old object-read API and move its remaining users to
the supported access mechanism. This removes a duplicate interface
which we no longer need.
- "mm/mempolicy: stop copying state in the interleave paths" (Gregory
Price):
Stop copying mempolicy state in the interleave paths when a reference
to the existing policy will do. This avoids extra work and makes the
ownership rules less obscure.
- "mm/mglru: speed up inc_min_seq() and fix cold/hot inversions" (Barry
Song):
Make MGLRU's generation advancement cheaper and fix cases where cold
and hot folios end up in the wrong order. Adjust the counter and list
handling so reclaim doesn't keep passing over the better eviction
candidates.
- "mm: Fix MF_DELAYED handling on memory failure" (Lisa Wang):
Treat MF_DELAYED as a partially completed memory-failure operation,
not an outright failure. Propagate that result correctly through
shmem and the generic handler, fix the extra-reference accounting,
and add tests for the resulting SIGBUS behavior.
- "tools/mm/page_owner_sort: fix --sort, add module filter, improve
usage" (Ye Liu):
Fix page_owner_sort's --sort handling, add module-based filtering and
make the usage output more helpful. This makes the tool less
frustrating when tracking down who is holding on to pages.
- "mm/damon: move damos filter range arguments validation to core" (SJ
Park):
Move DAMOS filter range validation into the core, where all callers
can share it. Also close the sysfs read-twice races which could pass
inconsistent ranges, and add tests for invalid input.
- "mm/damon: misc cleanups" (Zenghui Yu):
Clean up a collection of small DAMON rough edges in the core,
interfaces and tests. No large behavior change here, just simpler
code and fewer opportunities for confusion.
- "mm/damon: cleanup code, add test cases, and update guidances in
docs" (SJ Park):
Clean up DAMON's core and interfaces, add missing test cases and
bring the documentation into line with the code. These changes should
make the newer facilities easier to understand and maintain.
- "mm/damon: introduce hugepage_size probe filter" (SJ Park):
Add a DAMON probe filter for hugepage size. Let users select a range
of folio sizes through sysfs, validate the range and document the new
interface, so monitoring can concentrate on memory backed by the
desired hugepage sizes.
- "selftests/mm: pagemap_ioctl test fixes and cleanups" (Zenghui Yu):
Fix some pagemap ioctl test assumptions and clean up their setup and
reporting. Make failures point to the operation that went wrong
rather than to test harness bookkeeping.
- "mm: avoid large folio splits when swap is unavailable" (Johannes
Weiner):
Avoid splitting large folios merely to attempt swap when no swap
space is available. There is little point paying for an expensive
split when reclaim cannot actually swap the resulting pages out.
- "mm: workingset: fix the shadow node budget under MGLRU" (Hui Zhu):
Fix the workingset shadow-node budget with MGLRU enabled. Keep the
shadow entries within the intended limits so refault tracking does
not quietly consume more metadata than it should.
- "selftests/mm: TAP output and global-state fixes" (Song Hu):
Fix selftests which produce misleading TAP output or fail to restore
global settings after a run. A test ought to leave the system as it
found it, particularly when a whole suite follows behind.
- "mm: remove page_swap_entry()" (Tal Zussman):
Remove page_swap_entry() and convert its remaining users to the folio
and swap-entry helpers. Lose an old page-level interface and make the
swap paths a little more consistent.
- "mm: refactor zonelist constructors and iterators" (Gregory Price):
Refactor the zonelist construction and walk helpers to reduce
duplicated logic. Keep the allocation ordering rules intact while
making it clearer how zones are selected.
- "mm: kmemleak: batch the struct page scan" (Breno Leitao):
Scan adjacent struct pages in batches instead of taking kmemleak_lock
once for every single page. This preserves scan coverage and the
lock-hold bound, while cutting overhead substantially on debug
kernels.
- "mm/damon: misc improvements in tests and documents" (Zenghui Yu):
Fix some DAMON selftests which leave kdamond running or fail under
Python safe-path mode, and improve the KUnit coverage and
documentation. Nothing especially glamorous, but these are worth
doing.
- "mm/damon: introduce probe_hits_wsum DAMOS core filter" (SJ Park):
Add a DAMOS core filter using weighted probe-hit counts. This gives
schemes another way to select regions based on what the monitoring
probes observed.
- "mm/mglru: fix ineffective memory protection for non-kswapd reclaim"
(Ridong Chen):
Fix MGLRU's memory protection handling for reclaim outside kswapd.
The protection settings weren't having the intended effect in these
paths, leaving protected memory more exposed than requested.
- "mm/damon: improve readability, clarity and test coverage" (SJ Park):
Simplify a handful of DAMON core helpers, clarify their behavior and
expand test coverage. There are no intended userspace-visible changes
in this batch.
- "mm: replace PF_KCOMPACTD/PF_KSWAPD with kthread_func()" (Kefeng
Wang):
Stop identifying reclaim and compaction workers through the PF_KSWAPD
and PF_KCOMPACTD task flags. Use their kthread functions instead and
remove the redundant flag plumbing.
- "mm/hugetlb: fix surplus accounting and availability checks during
demotion" (Longlong Xia):
Fix HugeTLB surplus accounting and availability checks when demoting
huge pages. Keep the counters and reservation decisions consistent as
one huge page turns into several smaller ones.
- "mm/damon: add kunit tests for probe_hits handling and probe params
validation" (Jason Angelov):
Add KUnit tests for DAMON probe-hit handling and invalid probe
parameters. These cover edge cases that were too easy to miss in
ordinary monitoring tests.
- "mm/damon: fix misc bugs in kunit, quota goals and sysfs refresh_ms"
(SJ Park):
Fix a few DAMON bugs in KUnit tests, quota-goal handling and the
sysfs refresh interval. Small fixes, but the incorrect results and
control behavior were real.
- "mm: zswap: optimize zswap invalidate and store" (Kefeng Wang):
Simplify zswap's invalidate and store paths to avoid avoidable
lookups and work. Keep the entry lifetime rules intact while making
those frequent operations cheaper.
- "mm: replace custom ratelimiting logic" (Pedro Falcato):
Replace hand-rolled MM rate limiting with the common kernel helpers.
There is no need to maintain another local version of the same
mechanism.
- "mm/vmalloc: minor cleanups" (Ye Liu):
Tidy some vmalloc initialization and reporting code, and pull
duplicated vmap-area insertion work into a helper. No functional
changes are intended.
- "mm/mglru: clean up isolate_folios for readability and clarity"
(Ridong Chen):
Clean up MGLRU's isolate_folios() so the decisions are easier to read
and verify. Keep reclaim behavior unchanged while removing
unnecessary twists in the control flow.
- "Catch automatic storage in IDA and Maple Tree definitions" (Yury
Norov):
Catch IDA and maple-tree definitions placed in automatic storage
where the lifetime rules are wrong or easy to get wrong. Add checks
so such mistakes are harder to slip through unnoticed.
- "mm, swap: some random fixes and cleanups" (Kemeng Shi):
Fix and simplify a few unrelated swap paths, removing redundant work
and tidying up error handling. A small collection of things which
were better fixed than left lying around.
- "mm/page_io: folio conversion cleanups" (Tal Zussman):
Finish some page-to-folio conversions in swap I/O, removing obsolete
wrappers and using folio operations consistently. The I/O behavior is
intended to remain the same.
- "mm/swap: skip empty clusters in the swapoff scan" (Youngjun Park):
Skip empty swap clusters during swapoff instead of walking slots
which have nothing to release. This avoids pointless work on sparsely
used swap devices.
- "mm: trace: decode architecture-specific VMA flags" (Meijing Zhao):
Teach the VMA trace output to decode architecture-specific flags,
rather than leaving them as unexplained bits. That should make
tracing a good deal more useful when debugging unusual mappings.
- "mm, swap: don't spin on a bad swap entry" (Breno Leitao):
Stop repeatedly retrying a swap entry which is already known to be
bad. Make the error path terminate cleanly instead of wasting CPU
chasing an entry that cannot be used.
- "mm/page_isolation: fix UBSAN shift-out-of-bounds in
isolate_single_pageblock" (Qi Xi):
Fix an out-of-range shift in isolate_single_pageblock() and tighten
its associated boundary handling. UBSAN found the issue; the result
should be more robust pageblock isolation.
- "mm: khugepaged: fix tracepoint UAF" (Vernon Yang):
Fix a use-after-free in khugepaged tracepoint handling. Make sure the
information recorded by tracing stays valid for as long as the trace
event needs it.
- "mm/damon: fix DAMOS bugs in core, paddr and vaddr" (SJ Park):
Fix several DAMOS problems across the core and physical- and
virtual-address backends. The changes close error cases and bring the
implementations back into agreement.
- "mm/hugetlb_cgroup: move the per-node usage along with the folio"
(Hongfu Li):
Move HugeTLB per-node usage accounting when folios migrate between
nodes or are reparented to another cgroup. Otherwise numa_stat can
retain stale charges and even underflow when the folio is freed.
- "docs/core-api: memory-allocation: add k[mz]alloc_obj() and clarify
kmalloc" (Mike Rapoport):
Document the typed k[mz]alloc_obj() allocation helpers and clear up
some kmalloc guidance. Make it easier for callers to choose the right
interface.
- "selftests/mm: Validate selections and scope memfd_secret setup"
(Tianyi Chen):
Check selftest selections before running and confine memfd_secret
setup to the cases that actually need it. Avoid confusing failures
caused by the test harness itself.
- "mm/damon: move zero damos quota target_value handling to the core
layer" (SJ Park):
Handle a zero DAMOS quota goal target in the core rather than making
each user of the interface invent its own rule. Keep quota decisions
consistent across callers.
- "mm/damon: Introduce a huge page collapsing mechanism using auto
tuning" (Asier Gutierrez):
Add an auto-tuned DAMON mechanism for collapsing huge pages. Use
monitoring feedback to decide when collapse is worthwhile rather than
forcing one fixed policy onto every workload.
- "kmemleak: fix stale documentation and raise the verbose default"
(Breno Leitao):
Bring the kmemleak documentation up to date and require a third
confirming scan before verbose kernels print a suspected leak. The
extra scan helps suppress transient false positives in noisy debug
builds.
- "mm/memory: improve insert_pages() error handling" (Avi Weiss):
Tighten insert_pages() error handling so partial failures are
reported and cleaned up consistently. The caller should not have to
guess how far the operation got.
- "mm/damon: allow NULL or unstarted damon_ctx parameter for
damon_call()" (SJ Park):
Make damon_call() handle NULL and not-yet-started contexts safely.
Simplify the rules for callers and avoid an indefinite wait on an
invalid state.
- "mm/damon: introduce pgidle_set probe filter type" (SJ Park):
Add a pgidle_set DAMON probe filter, giving monitoring users another
way to select pages by their idle-tracking state. Wire it through the
filter interfaces and tests.
- "mm/damon/core: remove unused helper functions" (Cheng-Han Wu):
Remove DAMON core helpers which no longer have callers. Keep the API
surface smaller rather than retaining dead code just in case.
- "mm: stop calling pmd_folio() on special PMDs" (Gregory Price):
Avoid calling pmd_folio() on special PMD mappings that have no struct
page. The old assumption could fault in procfs walkers; use the
normal-folio checks and handle those mappings properly.
- "mm: remove three unused helpers from mm.h" (Tal Zussman):
Remove three unused helpers from mm.h. Fewer obsolete interfaces for
the next person to stumble over.
- "mm/damon: improvements in efficiency, error handling, documents"
(Liew Rui Yan):
Skip needless DAMOS quota work once the quota is full, propagate a
missing sysfs error and tidy a couple of comments. The ignored error
could make a monitoring-start request appear successful when it
wasn't.
- "docs/mm/damon/design: add explanation of nr_snapshots" (Liew Rui
Yan):
Explain DAMON's nr_snapshots accounting in the design documentation
and straighten out the associated terminology. Make it clearer what
users should expect from that counter.
- "selftests/cgroup: fixes for test_zswap on single core VM" (Wilson
Felipe Pereira):
Fix two test_zswap failures on single-CPU VMs. Wait for the exiting
child's cgroup to become unpopulated before reconfiguring it, and
avoid another test assumption which breaks under constrained
scheduling.
- "docs/ksm: fix advisor documentation and comment" (Jinjiang Tu):
Correct the KSM advisor documentation and a misleading code comment.
Keep the description aligned with how the advisor actually works.
- "Fix bugs in HugeTLB allocation when mem_cgroup_charge_hugetlb()
fails" (Ackerley Tng):
Fix HugeTLB allocation cleanup when the memcg charge fails. Make sure
failure exits undo what was allocated rather than leaving stale
accounting or resources behind.
- "mm, memcg: fix memory.peak reset clobbering other fds' watermark"
(Ridong Chen):
Fix memory.peak reset handling so resetting one file descriptor
doesn't overwrite the watermark kept for another. Keep those per-open
measurements independent as intended.
- "mm: reject zone device folios in more folio walkers" (Gregory
Price):
Reject zone-device folios in page walkers that cannot safely handle
them. Extend the existing checks rather than assuming every folio has
ordinary system-memory backing.
- "percpu: remove code with no effect" (Sang-Heon Jeon):
Remove a few pieces of percpu code which no longer do anything. There
is no reason to keep maintaining dead paths.
* tag 'mm-stable-2026-10-19-21-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (539 commits)
mm: shmem: assign a lock class to the unused huge shrinklist
mm: vmscan: put rotation-missed folios at the LRU tail
mm: kmemleak: scan the struct page array in MAX_SCAN_SIZE batches
mm: kmemleak: move the struct page scan into a helper
mm/damon: document that a zero sample_interval is accepted
mm/damon: fix typos in comments
mm/damon/sysfs: propagate damon_call() error in turn_damon_on
mm/damon/core: skip quota score setup when the quota is full
mm/damon/tests/core-kunit: test the size charged for a filter-trimmed region
mm/damon/core: charge only the part of a region the filter left
mm: disallow raw PFN mappings of huge/shared zeropage
selftests/mm: zap whole PTE tables in the khugepaged race harness
selftests/mm: add memory-pressure threads to the khugepaged race harness
selftests/mm: race the collapse of windows with holes
selftests/mm: add khugepaged race harness
selftests/mm: check that one khugepaged pass collapses one window
selftests/mm: run every supported collapse order by default
selftests/mm: cover a shared-source collapse write race
selftests/mm: parameterize the mixed-source collapse case by source order
selftests/mm: add order-parameterized khugepaged collapse cases
...
|
||
|
Mukesh R
|
56fb075b77 |
mshv: Redesign hypervisor memory deposit logic
The current memory deposit implementation has a few issues and bugs: o It is very slow: one of the main contributions to slow VM creations and boot is many hypercalls repeatedly coming back with insufficient memory. On Hyper-V, a hypercall returns with such status whenever it cannot complete due to lack of memory in the hypervisor and needs more. o Contiguous range requirement is broken, and is critical bug o An incorrect assumption is made that contiguous memory size would always be power of 2. o Two pages are allocated, only one is really needed. Extra alloc adds to the overhead. o For a 512 page deposit, the allocation is split into two: one for 511 and second for 1. Thus, an order 9 allocation never happens. A contiguous 2M range, if possible, greatly improves performance in the hypervisor as it can be mapped as large page whenever possible. Also, removing extra allocation reduces overhead in linux. o Since a page is already allocated to collect the frames, there is not really a need to use per cpu input page, and hence avoid local irq disable. o In hv_call_deposit_pages(), in case of error, under err_free_allocations label, all pages are freed without checking status to see if some pages were deposited. This is a critical bug as it would free pages that hyp may be using. All of above is addressed by: o Allocate 2M by default, this is the recommendation from the hypervisor team, and greatly improves performance. Depositing one or few pages at a time results in lot of insufficient memory returns from hypercalls. o Always start with a full 2M range allocation, thus getting contiguous if available. In cases where possible, the deposits are much faster. o Allocate only one page in the deposit function and collect 511 pfns there. Just use a local variable for last pfn. o Use the page as input to hypercall. Since this page is locally allocated, irq disable can be avoided helping speed up the deposit. o Fix the physical contiguous memory enforcement.. o Lastly, remove pre-deposits hv_call_create_vp() and hv_call_initialize_partition() as they were removed internally while ago, most likely because they didn't help much. Signed-off-by: Mukesh R <mrathor@linux.microsoft.com> Reviewed-by: Souradeep Chakrabarti <schakrabarti@linux.microsoft.com> Signed-off-by: Wei Liu <wei.liu@kernel.org> |
||
|
Linus Torvalds
|
ccc4d9f891 |
Updates for the VDSO subsystem:
- Ensure that the CLOCK_AUX base calculations are properly scaled against
the base timekeeper. The update function failed to take the fractional
nanosecond part into account, which results in a rounding error.
- Cleanup and consolidate the vsyscall headers to get rid of pointless
copies all over the architectures.
- Replace a runtime conditional in the time getter function for namespaced
clocks by simple pointer arithmetic which speeds up the read function.
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Merge tag 'timers-vdso-2026-10-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull VDSO updates from Thomas Gleixner:
"Updates for the VDSO subsystem:
- Ensure that the CLOCK_AUX base calculations are properly scaled
against the base timekeeper. The update function failed to take the
fractional nanosecond part into account, which results in a
rounding error.
- Cleanup and consolidate the vsyscall headers to get rid of
pointless copies all over the architectures.
- Replace a runtime conditional in the time getter function for
namespaced clocks by simple pointer arithmetic which speeds up the
read function"
* tag 'timers-vdso-2026-10-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
vdso/vsyscall: Keep the CLOCK_AUX base scaled
vdso/math64: Add and use __iter_div64_u64_rem()
vdso/math64: Use OPTIMIZER_HIDE_VAR() in __iter_div_u64_rem()
vdso/gettimeofday: Avoid runtime conditional in do_hres_timens()
vdso: Remove __ASSEMBLER__ guards from vsyscall.h
vdso: Add asm-generic/vdso/vsyscall.h
vdso: Remove unnecessary vdso/vsyscall.h includes
riscv/hwprobe: Include vdso/datapage.h
arm64/vdso: Delete asm/vdso/vsyscall.h inclusions
x86/vdso: Delete asm/vdso/vsyscall.h inclusions
sparc/vdso: Delete asm/vdso/vsyscall.h inclusion
s390/vdso: Delete asm/vdso/vsyscall.h inclusions
sparc/vdso: Move __VDSO_PAGES to asm/vdso.h
x86/vdso: Move vDSO page definitions to asm/vdso.h
vdso: Delete asm-generic/vdso/vsyscall.h
vdso/vsyscall: Define fallback time synchronization functions in vsyscall.c
vdso/getrandom: Define fallback __arch_get_vdso_u_rng_data() in getrandom.c
vdso/gettimeofday: Define fallback __arch_get_vdso_u_time_data() in gettimeofday.c
vdso: Move the kernel-side time update helpers to a new header
|
||
|
Linus Torvalds
|
bb29b957ea |
Kbuild / Kconfig updates for 7.4
Kbuild:
- Suppress compiler flags in debug info for external module builds
- Use '-fmacro-prefix-map' in more places in the build
- Merge initial set of changes from Lorenzo's speed up series, along
with some fixes found through testing
- Avoid allocating .modinfo in vmlinux
- Speed up kallsyms by indexing symbols by token and outputting binary
data to disk directly then including in assembly via .incbin
- Don't sort $(NM) output when unnecessary
- Only emit relocations on the final vmlinx link
- Reimplement mksysmap in C
- Move many cc-option and ld-option calls into the Kconfig stage to
cache their results
- Use pigz for gzip compression when available
- Move gen_init_cpio and gen_initramfs.sh from usr/ to scripts/
- Add a TOML configuration to scripts/container and update documentation
accordingly
- Add a generic, opt-in mechanism for checking that headers can compile
standalone
- Update machine function splitting argument for LLVM 24 rename in
AutoFDO build
- Miscellaneous minor clean ups, fixes, and hardening, mostly
found/fixed via LLMs
Kconfig:
- Turn recursive ranges into an error
- Fix savedefconfig for defaults that were adjusted for being out of
range and revert a previously applied workaround
- Improvements and hardening around integer and hexadecimal values
- Emit a warning when selecting or implying a choice symbol, which has no
effect
- Emit a warning when KCONFIG_PROBABILITY is malformed
- Introduce def_string / def_int / def_hex to mirror the existing
def_bool / def_tristate to succinctly set a value and type at the same
time.
- Add cc-option-str and ld-option-str macros to act like Kbuild's
cc-option and ld-option, returning the string when the option is
supported, allowing many checks to be moved into Kconfig
- Minor usability improvements to Kconfig tests
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
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Merge tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux
Pull Kbuild / Kconfig updates from Nathan Chancellor:
"Kbuild:
- Suppress compiler flags in debug info for external module builds
- Use '-fmacro-prefix-map' in more places in the build
- Merge initial set of changes from Lorenzo's speed up series, along
with some fixes found through testing:
- Avoid allocating .modinfo in vmlinux
- Speed up kallsyms by indexing symbols by token and outputting
binary data to disk directly then including in assembly via
.incbin
- Don't sort $(NM) output when unnecessary
- Only emit relocations on the final vmlinx link
- Reimplement mksysmap in C
- Move many cc-option and ld-option calls into the Kconfig stage to
cache their results
- Use pigz for gzip compression when available
- Move gen_init_cpio and gen_initramfs.sh from usr/ to scripts/
- Add a TOML configuration to scripts/container and update
documentation accordingly
- Add a generic, opt-in mechanism for checking that headers can
compile standalone
- Update machine function splitting argument for LLVM 24 rename in
AutoFDO build
- Miscellaneous minor clean ups, fixes, and hardening, mostly
found/fixed via LLMs
Kconfig:
- Turn recursive ranges into an error
- Fix savedefconfig for defaults that were adjusted for being out of
range and revert a previously applied workaround
- Improvements and hardening around integer and hexadecimal values
- Emit a warning when selecting or implying a choice symbol, which
has no effect
- Emit a warning when KCONFIG_PROBABILITY is malformed
- Introduce def_string / def_int / def_hex to mirror the existing
def_bool / def_tristate to succinctly set a value and type at the
same time.
- Add cc-option-str and ld-option-str macros to act like Kbuild's
cc-option and ld-option, returning the string when the option is
supported, allowing many checks to be moved into Kconfig
- Minor usability improvements to Kconfig tests"
* tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (59 commits)
kbuild: AutoFDO: Update split machine function argument for upstream rename
kbuild: Mark the initcall ordering recipe as recursive
kbuild: Mark the gzip recipes as recursive
localmodconfig: Explicitly report boolean configs during integrity check
scripts/make_fit: Ignore schema checks when decomposing DTBs
clang-tools: Import os for broken pipe handling
kconfig: use the value argument in sym_get_near_range_bound()
kconfig: fix infinite loop in conf_choice() when no choice value is visible
kconfig: cleanup stale comment about 'keys' array
kconfig: Improve ergonomics around disabling warnings with cc-option
scripts/Kconfig.toolchain: Drop compiler symbols from dependencies
checkkconfigsymbols.py: Parse Git status output line by line
gen_init_cpio: stop parsing on lines with a missing argument list
.gitignore: drop Module.markers
.gitignore: ignore pacman package signatures
kbuild: add header check facility as a manually run static analyzer
Documentation: dev-tools: refer to user ID rather than id
Documentation: dev-tools: update container.rst with config file
scripts: add TOML config to container tool
kconfig: tests: {old,save}defconfig: Forward dynamic keyword arguments
...
|
||
|
Shradha Gupta
|
228e21764b |
Drivers: hv: Run VMBus kexec cleanup from syscore shutdown
ARM64 Hyper-V guests do not run the VMBus kexec cleanup before secondary CPUs are stopped. Consequently, the old VMBus connection and SynIC state remain active when the kexec kernel starts. Run the VMBus kexec handler from the existing VMBus syscore shutdown callback. syscore_shutdown() runs after device shutdown and before machine shutdown, while all CPUs needed by the SynIC CPU hotplug teardown are still available. Guard the callback with kexec_is_in_progress() so normal restart, halt, and poweroff paths are unchanged. Use the same path on x86 and remove the architecture-specific handler pointer and the weak setup/remove interfaces. VMBus teardown now precedes hv_stimer_global_cleanup() on x86. The new x86 ordering relies on commit |
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Thomas Weißschuh
|
996b01393e |
vdso: Add asm-generic/vdso/vsyscall.h
Most architectures' asm/vdso/vsyscall.h do not define any symbols. Add an empty asm-generic variant and replace the pointless architecture-specific copies. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260909-vdso-asm-generic-vsyscall-h-v1-14-63ae856cc659@linutronix.de |
||
|
Thomas Weißschuh
|
8579b901d1 |
vdso: Delete asm-generic/vdso/vsyscall.h
Recent refactoring have made the header empty. Remove it and its mentions. Also that header was never a real asm-generic header anyways. It had no reason to be in the asm-generic directory. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260909-vdso-asm-generic-vsyscall-h-v1-5-63ae856cc659@linutronix.de |
||
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Thomas Weißschuh
|
e4eeeaa14d |
vdso/vsyscall: Define fallback time synchronization functions in vsyscall.c
__arch_update_vdso_clock() and __arch_sync_vdso_time_data() are only used in vsyscall.c. vsyscall.h has become a dumping ground for different kinds of fallbacks. Move the fallback function definitions into vsyscall.c. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260909-vdso-asm-generic-vsyscall-h-v1-4-63ae856cc659@linutronix.de |
||
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Thomas Weißschuh
|
ca0da001d3 |
vdso/getrandom: Define fallback __arch_get_vdso_u_rng_data() in getrandom.c
__arch_get_vdso_u_rng_data() is only used in getrandom.c. vsyscall.h has become a dumping ground for different kinds of fallbacks. Move the fallback function definition into getrandom.c, similar to other fallbacks. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260909-vdso-asm-generic-vsyscall-h-v1-3-63ae856cc659@linutronix.de |
||
|
Thomas Weißschuh
|
4fba7bb3e7 |
vdso/gettimeofday: Define fallback __arch_get_vdso_u_time_data() in gettimeofday.c
__arch_get_vdso_u_time_data() is only used in gettimeofday.c. vsyscall.h has become a dumping ground for different kinds of fallbacks. Move the fallback function definition into gettimeofday.c, similar to other fallbacks. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260909-vdso-asm-generic-vsyscall-h-v1-2-63ae856cc659@linutronix.de |
||
|
Alan Maguire
|
672981f4ae
|
kbuild, btf: Expose vmlinux inline BTF through sysfs
Expose BTF inline-location information from vmlinux .BTF.inline sections in /sys/kernel/btf as vmlinux.inline. Embedded vmlinux inline BTF supports read-only mmap(). Provide runtime support for a module-delivered vmlinux inline BTF carrier. Its link record binds the carrier module name, BTF size, and SHA-256 digest to the running kernel before its data is made available through a lazy vmlinux.inline sysfs attribute. The carrier is handled before ordinary module BTF registration, so its incidental .BTF data is not exposed. Make CONFIG_DEBUG_INFO_BTF_INLINE tristate. When configured as a module, retain vmlinux final split inline BTF for btf_vmlinux_inline.ko instead of embedding it in vmlinux. Reserve .BTF.inline.link in vmlinux and extend the final resolve_btfids patch pass to bind btf_vmlinux_inline to the raw vmlinux.BTF.inline payload. This preserves the normal built-in configuration while allowing the large inline BTF payload to load on demand. Normal module inline BTF is handled separately, after its references have been relocated against the final module BTF. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://patch.msgid.link/20261009112324.1442319-4-alan.maguire@oracle.com |
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Pratyush Yadav (Google)
|
8ebd2eb87f |
kho: rename KHO scratch to KHO bootmem
The term "KHO scratch" is vague and overloaded. For one, it does not accurately describe what the memory is for. From KHO's perspective, it is memory passed by the previous kernel that is guaranteed to have no allocations and hence it is safe to allocate from. For another, the term is overloaded. KHO also knows to discover other ranges of memory that don't have any preservations and are safe to allocate from. This is done by kho_extend_scratch(). These areas, while called "scratch", are completely different from the chunk of memory passed by the previous kernel for early boot allocations. Rename "KHO scratch" to "KHO boot memory", or "KHO bootmem" in short. Update all function names, variable names, comments, and documentation to use this. Call the discovered areas "noprsrv", matching what memblock would see them as. Rename kho_extend_scratch() to reflect this. This patch largely has no functional changes. The only functional changes are renames of debugfs files from "scratch_phys" and "scratch_len" to "bootmem_phys" and "bootmem_len" respectively. Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org> Link: https://patch.msgid.link/20260922041321.233986-4-pratyush@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> |
||
|
Yu Zhang
|
118bdac105 |
Drivers: hv: Add logical device ID registry for vPCI devices
Hyper-V identifies each PCI pass-thru device by a logical device ID in its hypercall interface. This ID consists of a per-bus prefix, derived from the VMBus device instance GUID, combined with the PCI function number of the endpoint device. Add a registry in hv_common.c that maps a PCI domain number to its logical device ID prefix. The vPCI bus driver (pci-hyperv) registers the prefix when a bus is probed and unregisters it when the bus is removed. Consumers such as the para-virtualized IOMMU driver look up the prefix by PCI domain number and combine it with the function number to form the complete logical device ID for hypercalls. Use rhashtable for the sparse exact-match mapping. Lookups copy the prefix while holding the RCU read lock, and removal defers freeing the entry until existing readers have completed. The prefix construction is shared via hv_build_logical_dev_id_prefix() so that pci-hyperv's interrupt retargeting path and the registry use exactly the same byte layout. It is derived on demand from the constant hv_device instance GUID rather than cached in struct hv_pcibus_device, which is private to the pci-hyperv module; this keeps the interface narrow and avoids depending on pci-hyperv internals. Co-developed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com> Signed-off-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com> Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> |
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Lorenzo Stoakes (ARM)
|
35e340a478 |
mm: userland pgtable freeing is RCU-safe now, remove leftover bits
Now every architecture has been converted to support
CONFIG_MMU_GATHER_RCU_TABLE_FREE, this configuration option no longer
makes any sense to keep around.
Therefore remove it, and remove all the dead code that existed for
!CONFIG_MMU_GATHER_RCU_TABLE_FREE architectures previously.
Additionally, CONFIG_MMU_GATHER_TABLE_FREE is no longer necessary, as all
architectures instead use CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE when a custom
__tlb_remove_table() is required, so remove this too.
A number of architectures only enabled CONFIG_MMU_GATHER_RCU_TABLE_FREE if
CONFIG_MMU was set, however the mmu_gather logic only actually does
something meaningful if CONFIG_MMU is set (mmu_gather.c is only compiled
in this case, for instance).
As a result, there's no need to gate any of this logic on CONFIG_MMU
explicitly.
CONFIG_PT_RECLAIM however does have a strict dependency on CONFIG_MMU, so
make this dependency explicit.
Additionally, correct comments to remove references to non-RCU page table
gathering and make it clear that this is not 'semi-RCU', nor has it been
since commit
|
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Anshuman Khandual
|
c970236c30 |
mm: drop pxd_ERROR()
There are no more users left for any pxd_ERROR() either in generic MM or in the platform MM. Hence all these platform macros along with their generic fallback could be dropped across the tree. Link: https://lore.kernel.org/20260831054331.625505-9-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Acked-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Helge Deller <deller@gmx.de> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: James Bottomley <james.bottomley@HansenPartnership.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Rich Felker <dalias@libc.org> Cc: Samuel Holland <samuel.holland@sifive.com> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> |
||
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Sasha Levin
|
a98db74187
|
kbuild: keep .modinfo when vmlinux is linked with --gc-sections
Builds with CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y, such as arm allmodconfig, now fail while extracting modules.builtin.modinfo: arm-linux-gnueabihf-objcopy: vmlinux.unstripped: can't dump section '.modinfo' - it does not exist: file format not recognized /bin/sh: 1: cannot open modules.builtin.modinfo: No such file or, with LLVM: llvm-objcopy: error: 'vmlinux.unstripped': section '.modinfo' not found Nothing references the MODULE_INFO() strings, so --gc-sections discards every .modinfo input section and vmlinux.unstripped ends up with no .modinfo data. This is not new: ever since modules.builtin.modinfo started being extracted from vmlinux.unstripped, these builds have silently produced an empty file, losing the modinfo of every built-in module. An arm multi_v7_defconfig build with LD_DEAD_CODE_DATA_ELIMINATION on current mainline yields a 0 byte modules.builtin.modinfo. The switch to --dump-section only turned that into a build error. Wrap the input section in KEEP() so that the linker retains it. The output section is still (INFO), so nothing is allocated for it. With the same arm config, modules.builtin.modinfo now has 14119 entries, and on x86_64 defconfig, where nothing is garbage collected, it is byte-identical before and after this change. Found by KernelCI builds of the linus-next tree. Fixes: |
||
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Lorenzo Stoakes (ARM)
|
5fe4dd5966
|
kbuild: do not allocate .modinfo in vmlinux
Commit
|
||
|
Nathan Chancellor
|
36d4a11b56
|
kbuild: Remove alignment on .modinfo section
Commit |
||
|
Mark Rutland
|
b9d267b9d6 |
sched: dynamic: Simplify preempt_schedule{,_notrace}()
PREEMPT_DYNAMIC is now limited to the FULL and LAZY preemption models. In either model, both preempt_schedule() and preempt_schedule_notrace() are always called and never disabled. Remove the unnecessary code for these when PREEMPT_DYNAMIC is selected. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com> Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com> Tested-by: Mete Durlu <meted@linux.ibm.com> Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com> Tested-by: Jinjie Ruan <ruanjinjie@huawei.com> Link: https://patch.msgid.link/20260803191731.3244294-4-mark.rutland@arm.com |
||
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Linus Torvalds
|
91959a31a3 |
kho: make boot time huge page allocation work nicely with KHO
Today allocation of gigantic pages in HugeTLB cannot work reliably with KHO:
* HugeTLB allocates gigantic pages using memblock and autoscaling of KHO
scratch accounts for these allocations. When gigantic pages occupy half
of the memory of more, KHO fails to allocate its scratch memory.
* After kexec handover, memblock allocations exclusively use KHO scratch
that is not supposed to contain preserved memory. This essentially blocks
preservation of HugeTLB with gigantic pages.
Extend early memory pools available for KHO kernel with areas that are
guaranteed not to contain preserved memory.
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Merge tag 'liveupdate-v7.3-rc1-20260823' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux
Pull more liveupdate updates from Mike Rapoport:
"Make boot time huge page allocation work nicely with kexec handover.
Today allocation of gigantic pages in HugeTLB cannot work reliably
with kexec handover (KHO):
- HugeTLB allocates gigantic pages using memblock and autoscaling of
KHO scratch accounts for these allocations. When gigantic pages
occupy half of the memory of more, KHO fails to allocate its
scratch memory.
- After kexec handover, memblock allocations exclusively use KHO
scratch that is not supposed to contain preserved memory. This
essentially blocks preservation of HugeTLB with gigantic pages.
Extend early memory pools available for KHO kernel with areas that are
guaranteed not to contain preserved memory"
* tag 'liveupdate-v7.3-rc1-20260823' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux: (21 commits)
kho: exclude hugetlb memory from scratch size calculation
memblock: add memblock_reserved_hugetlb_size()
memblock: make HugeTLB bootmem allocation work with KHO
memblock: always include KHO headers
kho: extend scratch
mm/mm_init: don't rely on memblock to get KHO scratch migratetype
kho: initialize preserved memory map radix tree earlier
kho: initialize kho_scratch pointer earlier in boot
kho: expose kho_scratch_overlap() to kexec_handover.h
kho: add kho_radix_init_tree()
kho: allow destroying KHO radix tree
kho: allow early-boot usage of the KHO radix tree
kho: add data argument to radix walk callback
kho: add callback for table pages
kho: add a struct for radix callbacks
kho: move all memory retrieval logic to kho_mem_retrieve()
kho: store incoming radix tree in kho_in
kho: disallow wide keys in radix tree
kho: make radix max key width more obvious
kho: generalize radix tree APIs
...
|
||
|
Linus Torvalds
|
ed3b875bea |
mm.git review status for mm-hotfixes-stable..mm-stable
Everything:
Total patches: 501
Reviews/patch: 1.66
Reviewed rate: 70%
Excluding DAMON:
Total patches: 356
Reviews/patch: 2.26
Reviewed rate: 90%
Excluding DAMON and selftests:
Total patches: 329
Reviews/patch: 2.31
Reviewed rate: 92%
Excluding DAMON, selftests and maple_tree:
Total patches: 328
Reviews/patch: 2.31
Reviewed rate: 92%
Summary of patch series in this merge:
- The 2 patch series "mm: drop "sub" prefix from various places" from
Dev Jain implements some page->folio conversion and a naming cleanup.
- The 2 patch series "mm/kasan: remove redundant initialization for
kasan_flag_write_only" from Igor Putko provides some KASAN cleanup work.
- The 2 patch series "mm/filemap: reduce unnecessary xarray lookups"
from Chi Zhiling provides a small speedup in the pagecaache read code.
- The 4 patch series "mm/percpu: Fix possible NOFS/NOIO reclaim
recursion" from Kaitao Cheng improves a few things in the vmalloc code -
mainly the avoidance of GFP_KERNEL allocations when the caller asked for
GFP_NOFS or GFP_NOIO.
- The 3 patch series "mm/kmemleak: avoid soft lockup when scanning task
stacks" from Breno Leitao avoids a soft lockup watchdog trigger from the
kmemleak scanning code in extreme situations.
- The 6 patch series "mm/page_owner: misc cleanups" from Ye Liu is a
collection of unrelated cleanups to the page_owner code. For some
reason lots of people have been working on the page_owner code this
cycle.
- The 4 patch series "mm: convert to walk_page_range_vma() to eliminate
find_vma()" from Kefeng Wang simplifies and accelerates the page walking
library function.
- The 3 patch series "mm/migrate: preparatory cleanups for batch copy
and offload" from Shivank Garg implements cleanups in the migration
code.
- The 4 patch series "mm/page_owner: add per-fd filter infrastructure
for print_mode and NUMA filtering" from Zhen Ni provides per-fd
filtering to page_owner in order to reduce the sometimes vast amount of
output it can produce.
- The 19 patch series "mm: Refactor bootmem gigantic hugepage
allocation" from Muchun Song is a "set of fixes and preparatory cleanups
around bootmem HugeTLB handling, sparse initialization ordering, and
related vmemmap setup".
- The 4 patch series "mm/zsmalloc: reduce lock contention in zs_free()"
from Wenchao Hao reduces lock contention in zs_free(), which dominates
the unmap path under memory pressure on Android (LMK kills) and on x86
servers running zswap-heavy workloads. Up to 1.83x improvement in
microbenchmarking.
- The 2 patch series "move alloc_tag.c file under mm/" from Suren
Baghdasaryan does that.
- The 6 patch series "samples/damon: handle damon_{start,stop}()
failures" from SJ Park fixes improper handling of damon_start(),
damon_stop(), and damon_call() failures across DAMON sample modules to
prevent potential memory leaks, operation disruptions and use-after-free
bugs.
- The 11 patch series "mm/damon/sysfs: kobject_del() directories that
users can create/remove" from SJ Park resolves an issue where delayed
sysfs directory removal under CONFIG_DEBUG_KOBJECT_RELEASE causes
creation failures due to duplicate directory names by adding missing
kobject_del() calls before creating new directories.
- The 3 patch series "mm: cleanup clear_not_present_full_ptes()" from
David Hildenbrand cleans up the core pte handling code.
- The 3 patch series "selftests/damon: misc fixes for test bugs" from
Kunwu Chan fixes several bugs in the DAMON selftests.
- The 2 patch series "selftests/damon: fix memcg_path staging handling"
from Cheng Nie fixes a bug in _damon_sysfs.py for damos_filter
memcg_path setup, and adds a test case for it in sysfs.py.
- The 2 patch series "selftests/damon: test kdamond refresh_ms" from
Ruslan Valiyev introduces selftest coverage for DAMON's refresh_ms sysfs
feature by updating the test control module and verifying that scheme
stats update automatically without manual intervention.
- The 5 patch series "mm/damon: five misc fixups" from Akinobu Mita
contains miscellaneous DAMON fixups.
- The 2 patch series "mm/damon/core: detect internal variation above
max_nr_regions/2" from Jiayuan Chen fixes DAMON's region splitting
behavior when region counts exceed half the maximum budget by
dynamically scaling down the split fraction as the limit approaches,
preventing large regions from staying un-split, and adds corresponding
KUnit test coverage.
- The 6 patch series "mm: preparatory patches for PMD level swap
entries" from Usama Arif refactors and cleans up PMD softleaf helpers,
call sites, and architecture flags to lay the groundwork for a follow-up
series that introduces PMD page table swap entries.
- The 11 patch series "mm/damon: update, optimize, and clean up doc,
tests, and code" from SJ Park updates DAMON design and ABI
documentation, expands unit and selftest coverage, optimizes
damon_commit_target_regions(), and cleans up recently added sysfs
interface code for better readability.
- The 2 patch series "mm/vmpressure: reduce CPU, memory and code
overhead on cgroup v2" from Usama Arif optimizes vmpressure() by
skipping unnecessary work on cgroup v2 for userspace event notifications
and refactors v1-only eventfd handling into mm/memcontrol-v1.c to reduce
memory overhead and code complexity.
- The 10 patch series "selftests/mm: refactor pkey helpers and fix mmap
error handling" from Hongfu Li refactors pkeys shared tracing and
assertion helpers into a common file, unifies protection key selftests
to use consistent diagnostic logging and assertions, and enforces
standardized MAP_FAILED return checks for mmap() calls across the tests.
- The 18 patch series "mm/damon: optimize out nr_accesses_bp" from SJ
Park replaces the error-prone, continuously updated nr_accesses_bp field
in damon_region with an on-demand moving sum function
(damon_nr_accesses_mvsum()), reducing structure memory overhead and
avoiding state corruption bugs.
- The 6 patch series "Open HugeTLB allocation routine for more generic
use" from Ackerley Tng decouples HugeTLB folio allocation from VMA
dependencies by introducing hugetlb_alloc_folio(), enabling subsystems
like guest_memfd to allocate HugeTLB folios without standard VMA
reservations or pseudo-VMAs.
- The 3 patch series "mm/damon: provide pseudo moving sum probe_hits"
from SJ Park integrates DAMON's probe_hits attribute counter into the
pseudo moving sum infrastructure, enabling real-time, online monitoring
without waiting for full aggregation intervals.
- The 18 patch series "mm: Some cleanups for page allocator APIs" from
Brendan Jackman simplifies and refactors the page allocator entry points
and flags by unifying allocation paths, adding internal alloc_flags
arguments, and eliminating redundant __ prefixed alloc_pages variants.
- The 5 patch series "Fix incorrect access of hugetlb pte entries" from
Dev Jain enforces the consistent use of huge_ptep_get() instead of
ptep_get() for HugeTLB entries and fixes an unaligned address issue in
arm64's huge_ptep_get() implementation.
- The 8 patch series "mm/damon: validate all parameters in the core"
from SJ Park consolidates parameter validation into the DAMON core
specifically within damon_start() and damon_commit_ctx() to centralize
error checking, eliminate caller-side redundant checks and to improve
maintenance efficiency.
- The 3 patch series "tools/mm/page_owner_sort: fix filtering and
cleanup issues" from Yichong Chen renames is_need() to filter_record()
for clearer return semantics, fixes per-record allocation memory leaks
and bounds output copies in search_pattern() to address an existing
buffer issue.
- The 4 patch series "memcg: bail out reclaim when memcg is dying" from
Jiayuan Chen mitigates a system-wide stall which occurs when a cgroup is
removed while one of its memory control files is doing synchronous
reclaim.
- The 5 patch series "mm/memory-failure: add panic option for
unrecoverable pages" from Breno Leitao introduces an opt-in
vm.panic_on_unrecoverable_memory_failure sysctl that immediately panics
the kernel on unrecoverable memory errors in kernel-owned pages to
preserve error context and prevent delayed, silent data corruption.
- The 11 patch series "mm/damon: refactor damon_{start,stop,commit}()
for simple error handling" from SJ Park refactors the DAMON core API
functions to guarantee that all contexts are fully stopped when
damon_start(), damon_stop(), or damon_commit() fail, eliminating the
need for complex and error-prone caller-side cleanup code.
- The 5 patch series "Keep tail page private zero at free and folio
split" from Zi Yan adds checks to ensure tail_page->private is zero when
freeing compound or high-order pages and when promoting tail pages
during large folio splits. By validating these fields at free and split
time, it allows the removal of redundant private field clearing inside
prep_compound_tail().
- The 4 patch series "mm: drop redundant lru_add_drain in anon folio
reuse paths" from Barry Song eliminates redundant lru_add_drain() calls
in wp_can_reuse_anon_folio() and do_swap_page() to reduce LRU lock
contention and system overhead.
By validating folio refcounts against the LRU cache before draining
and removing unnecessary drains in the swap path, it achieves up to a
30.5% reduction in drain calls during heavy swap workloads.
- The 3 patch series "mm: clean up folio LRU and swap declarations" from
Jianyue Wu reorganizes folio LRU and swap code by relocating
page-cluster state to mm/swap_state.c, renaming mm/swap.c to mm/folio.c,
and moving MM-internal reclaim declarations into mm/internal.h.
- The 15 patch series "userfaultfd: working set tracking for VM guest
memory" from Kiryl Shutsemau adds userfaultfd support for tracking the
working set of VM guest memory, so a VMM can identify hot pages and
reclaim cold ones to tiered or remote storage.
- The 10 patch series "mm: remove CONFIG_HAVE_BOOTMEM_INFO_NODE (Part
2)" from David Hildenbrand removes the remaining pieces of
CONFIG_HAVE_BOOTMEM_INFO_NODE, performing some smaller cleanups around
freeing of reserved vmemmap pages on the way.
- The 7 patch series "mm/damon: update probe hits for runtime parameter
commits" from SJ Park ensures that DAMON's probe_hits attribute counter
is properly updated when monitoring intervals are changed at runtime,
matching the behavior of nr_accesses. To achieve this, it refactors and
renames existing helper functions for shared use, applies the updates to
probe_hits, and handles edge cases in damon_probe_hits_mvsum() to
maintain measurement accuracy.
- The 3 patch series "KSM: performance optimizations for rmap_walk_ksm"
from xu xin resolves a severe KSM reverse-mapping performance bottleneck
where thousands of split VMAs sharing a single anon_vma cause extended
lock contention. By adding an interval-filtering check during the rmap
walk, it reduces worst-case anon_vma lock hold times from over 500ms
down to under 2ms, preventing application freezes and latency spikes
under memory pressure.
- The 3 patch series "mm: split a couple of headers from internal.h"
from Mike Rapoport splits declarations related to mm_init, memblock,
vmalloc and sparse into new headers.
- The 2 patch series "KSM: use linear_page_index in collect_procs_ksm()"
from xu xin applies the interval tree optimization from rmap_walk_ksm()
to collect_procs_ksm() to avoid iterating over non-matching VMAs during
KSM memory error handling. It hoists loop-invariant address
initialization and restricts the anon_vma_interval_tree_foreach walk to
a targeted page offset range, reducing redundant checks and improving
lookup efficiency.
- The 3 patch series "selftests/mm: avoid false failures in hugetlb and
KSM tests" from Sayali Patil fixes issues in the hugetlb and KSM MM
selftest categories that can report failures when the prerequisites for
the tests are not satisfied.
- The 19 patch series "mm/damon: introduce data attributes only
monitoring" from SJ Park introduces attribute-weighted region management
in DAMON, allowing users to prioritize specific data attributes (such as
page sizes or cgroups) over or instead of access monitoring.
By assigning weights to attribute probes, DAMON can completely disable
access tracking and adjust monitoring regions based on weighted
probe-hit counters to optimize monitoring quality for attribute-focused
workloads.
- The 8 patch series "mm/hmm: Add mmap lock-drop support for
userfaultfd-backed mappings" from Stanislav Kinsburskii extends
hmm_range_fault() to support userfaultfd-backed regions by allowing the
mmap lock to be dropped during fault handling via a new
hmm_range_fault_locked() helper.
By accepting a locked pointer and signaling retry status when lock
release occurs, it enables page fault resolution in userfaultfd regions
while preserving backward compatibility for existing callers.
- The 33 patch series "mm: make VMA page offset handling more
consistent" from Lorenzo Stoakes cleans up and standardizes how
vma->vm_pgoff is accessed and manipulated across file-backed and
anonymous mappings in the kernel.
It introduces dedicated helper functions such as vma_start_pgoff(),
vma_end_pgoff(), vma_set_pgoff() and linear_page_delta() while renaming
rmap interval tree helpers to better reflect their functionality.
These changes establish a cleaner foundation for future work that will
unify virtual page offset indexing for all anonymous and CoW'd folios.
- The 3 patch series "mm: handle device-private PMDs in walk callbacks"
from Usama Arif addresses kernel panics and state corruption caused by
MM walk callbacks reaching non-present device-private PMD swap entries
created during HMM migrations.
It ensures that functions which acquire pmd_trans_huge_lock() properly
recognize device-private PMDs instead of assuming a present THP or a
standard migration entry.
- The 5 patch series "mm/rmap: Refactor try_to_unmap_one" from Dev Jain
refactors try_to_unmap_one by modularizing Hugetlb, anonymous-lazyfree,
and anonymous-swapbacked logic into dedicated functions, laying the
structural groundwork for batched anonymous large folio unmapping.
- The 4 patch series "Docs/ABI/damon: sysfs ABI document fixes and
additions" from Song Hu fixes typos and fills in missing entries in the
DAMON sysfs ABI document.
- The 10 patch series "dax/kmem: atomic whole-device hotplug via sysfs"
from Gregory Price introduces an atomic sysfs state attribute and
supporting DAX/MM infrastructure to prevent userland races when
offlining and removing entire memory regions.
By adding an unplugged state alongside standard online modes, it
enables whole-device atomic hotplug control while preserving backward
compatibility.
- The 13 patch series "mm: convert more vm_flags_t users to vma_flags_t"
from Lorenzo Stoakes continues transitioning the kernel from the
deprecated vm_flags_t type to vma_flags_t across core memory management
infrastructure.
It replaces legacy type usage in core functions such as do_mmap(),
unmapped area allocation, mm->def_vma_flags, and VMA operations like
mlock, mprotect, and mremap.
- The 2 patch series "Two small patches to clean up mm/mm_slot.h" from
xu xin refactors mm_slot.h by introducing mm_slot_remove() to unify
duplicate slot deletion sequences in khugepaged and KSM. It also adds
code documentation explaining why mm_slot_lookup and mm_slot_insert must
remain as preprocessor macros rather than static inline functions.
- The 10 patch series "mm/damon/core: hide core-private struct fields"
from SJ Park cleans up DAMON core structures by consistently marking
internal-only fields with private: comment tags to prevent improper
direct access from outer layers.
It enforces encapsulation across core structures including
damon_region, damon_target, and damon_ctx and updates DAMON_SYSFS to
interact through approved access APIs instead of exposing raw struct
members.
- The 6 patch series "mm/damon: unurgent fixes for infinite loop, NULL
de-ref and races" from SJ Park addresses potential infinite loops, NULL
dereferences, and race conditions identified in DAMON.
It fixes an infinite loop triggered by extreme user configurations, a
NULL pointer dereference within unit tests and minor monitoring
accuracy degradation caused by subtle runtime races.
- The 2 patch series "mm/page_alloc: fixes for free_pages_nolock() on
RT/UP" from Brendan Jackman fixes an NMI safety flaw in
__free_frozen_pages() where freeing pages on non-SMP or PREEMPT_RT
kernels can bypass can_spin_trylock() checks via non-PCP or isolated
migration paths.
It also resolves potential kernel crashes and privilege escalation
risks triggered when BPF tracing runs in NMI context alongside memory
hotplug or large allocation frees.
- The 4 patch series "mm/page_alloc: couple of followups for recent
cleanups" from Brendan Jackman cleans up and updates page allocator
nomenclature, documentation, and debug assertions.
It aligns internal FPI_ flags with the public "nolock" naming
convention, removes outdated internal implementation details from
high-level page allocator comments, and eliminates obsolete VM_BUG_ON()
assertions in allocation paths.
- The 3 patch series "mm/mseal: further cleanups" from Lorenzo Stoakes
refactors and simplifies the mseal implementation by clarifying API
boundaries and removing unnecessary code complexity.
It replaces generic do_mseal() usage outside the syscall with a
dedicated mseal_mmap_page_zero() helper for MMAP_PAGE_ZERO, eliminates
mm_struct parameters to enforce that sealing applies only to
current->mm, and streamlines overall logic and comments with no
functional changes intended.
- The 4 patch series "mm/vmscan: fix swappiness=max and clean up
per-node proactive reclaim" from Ridong Chen resolves reclaim behavior
bugs and cleans up function parameters across memory reclaim paths.
It fixes swappiness=max in both standard reclaim and MGLRU so
unswappable anonymous memory no longer falls back to evicting page
cache, ensures reclaim_store() returns accurate error codes instead of
collapsing all failures into -EAGAIN, and removes the obsolete gfp_mask
parameter from __node_reclaim().
- The 6 patch series "mm: mincore: misc cleanups" from Kefeng Wang
cleans up and simplifies the mincore code. Most importantly, it removes
the historical special behavior that always reports VM_PFNMAP pages as
non-resident.
- The 2 patch series "mm/huge_memory: drop dead split helper variants"
from Kiryl Shutsemau implements two trivial cleanups in the folio split
API.
- The 7 patch series "mm/damon: fix uninitialized DAMOS field and kunit
exec expectation bugs" from SJ Park resolves minor operational and
testing bugs in DAMON identified by Sashiko. It initializes the
damos->last_applied field to prevent occasional efficiency degradation
and fixes invalid memory accesses in DAMON KUnit tests during test
failure handling.
- The 3 patch series "cleanup for stable_page_flags()" from Jinjiang Tu
cleans up and refactors stable_page_flags() used by /proc/kpageflags
without altering functionality.
It uses BIT_ULL() to prevent shift-overflow warnings on 64-bit flag
bits, converts folio-specific flag checks to standard folio_test_*()
helpers, and removes redundant CONFIG_PAGE_IDLE_FLAG handling.
- The 3 patch series "Batch unmap of uffd-wp file folios" from Dev Jain
extends batched folio unmapping support to file folios within
userfaultfd write-protect (uffd-wp) VMAs by adding batching capabilities
to pte_install_uffd_wp_if_needed().
This removes special-case restrictions on uffd-wp VMAs in
try_to_unmap_one(), significantly simplifying the function's control
flow and complexity.
- The 3 patch series "mm/early_ioremap: clarify and clean up
early_ioremap_reset()" from Sang-Heon Jeon clarifies and cleans up the
architecture-specific usage of __late_set_fixmap() and
__late_clear_fixmap() after early_ioremap_reset().
It adds explicit documentation regarding when early_ioremap_reset()
must be called and removes redundant macro definitions and reset calls
in the RISC-V and ARM64 architectures.
- The 4 patch series "mm: fix reclaim storms in defrag_mode" from
Johannes Weiner addresses severe performance regressions, swap storms,
and spurious OOMs caused by vm.defrag_mode=1 under high memory pressure
in Meta production.
It updates the page allocator slowpath so non-movable allocation
requests actively trigger direct reclaim and direct compaction at
pageblock_order scale, allowing them to claim whole pageblocks rather
than spinning unproductively.
- The 2 patch series "zram: lockmap tweaks" from Sebastian Siewior
optimizes and fixes lockdep tracking for zram devices by consolidating
per-entry lockmaps and isolating lock classes across multiple instances.
It reduces memory overhead by replacing per-entry lockdep_map instances
with a single map per struct zram, and assigns a dynamic lock_class_key
to each instance to prevent false deadlock reports when different zram
devices are backed by distinct filesystems.
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Merge tag 'mm-stable-2026-08-18-18-39' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- "mm: drop "sub" prefix from various places" (Dev Jain)
page->folio conversion and a naming cleanup
- "mm/kasan: remove redundant initialization for kasan_flag_write_only"
(Igor Putko)
KASAN cleanup work
- "mm/filemap: reduce unnecessary xarray lookups" (Chi Zhiling)
Small speedup in the pagecaache read code
- "mm/percpu: Fix possible NOFS/NOIO reclaim recursion" (Kaitao Cheng)
Improve the vmalloc code - mainly the avoidance of GFP_KERNEL
allocations when the caller asked for GFP_NOFS or GFP_NOIO
- "mm/kmemleak: avoid soft lockup when scanning task stacks" (Breno
Leitao)
Avoid a soft lockup watchdog trigger from the kmemleak scanning code
in extreme situations
- "mm/page_owner: misc cleanups" (Ye Liu)
Cleanups to the page_owner code. For some reason lots of people have
been working on the page_owner code this cycle.
- "mm: convert to walk_page_range_vma() to eliminate find_vma()"
(Kefeng Wang)
Simplify and accelerate the page walking library function
- "mm/migrate: preparatory cleanups for batch copy and offload"
(Shivank Garg)
Cleanups in the migration code
- "mm/page_owner: add per-fd filter infrastructure for print_mode and
NUMA filtering" (Zhen Ni)
Per-fd filtering to page_owner in order to reduce the sometimes vast
amount of output it can produce
- "mm: Refactor bootmem gigantic hugepage allocation" (Muchun Song)
Fixes and preparatory cleanups around bootmem HugeTLB handling,
sparse initialization ordering, and related vmemmap setup
- "mm/zsmalloc: reduce lock contention in zs_free()" (Wenchao Hao)
Reduce lock contention in zs_free(), which dominates the unmap path
under memory pressure on Android (LMK kills) and on x86 servers
running zswap-heavy workloads.
Up to 1.83x improvement in microbenchmarking.
- "move alloc_tag.c file under mm/" (Suren Baghdasaryan)
- "samples/damon: handle damon_{start,stop}() failures" (SJ Park)
Fix improper handling of damon_start(), damon_stop(), and
damon_call() failures across DAMON sample modules to prevent
potential memory leaks, operation disruptions and use-after-free
bugs
- "mm/damon/sysfs: kobject_del() directories that users can
create/remove" (SJ Park)
Fix delayed sysfs directory removal under DEBUG_KOBJECT_RELEASE
causeing creation failures due to duplicate directory names by adding
missing kobject_del() calls before creating new directories
- "mm: cleanup clear_not_present_full_ptes()" (David Hildenbrand)
Clean up the core pte handling code
- "selftests/damon: misc fixes for test bugs" (Kunwu Chan)
Fix several bugs in the DAMON selftests
- "selftests/damon: fix memcg_path staging handling" (Cheng Nie)
Fix a bug in _damon_sysfs.py for damos_filter memcg_path setup, and
add a test case for it in sysfs.py.
- "selftests/damon: test kdamond refresh_ms" (Ruslan Valiyev)
Selftest coverage for DAMON's refresh_ms sysfs feature by updating
the test control module and verifying that scheme stats update
automatically without manual intervention
- "mm/damon: five misc fixups" (Akinobu Mita)
Miscellaneous DAMON fixups.
- "mm/damon/core: detect internal variation above max_nr_regions/2"
(Jiayuan Chen)
Fix DAMON's region splitting behavior when region counts exceed half
the maximum budget by dynamically scaling down the split fraction as
the limit approaches, preventing large regions from staying un-split,
and add corresponding KUnit test coverage
- "mm: preparatory patches for PMD level swap entries" (Usama Arif)
Refactor and clean up PMD softleaf helpers, call sites, and
architecture flags to lay the groundwork for a follow-up series that
introduces PMD page table swap entries
- "mm/damon: update, optimize, and clean up doc, tests, and code" (SJ
Park)
Update DAMON design and ABI documentation, expands unit and selftest
coverage, optimize damon_commit_target_regions(), and clean up
recently added sysfs interface code for better readability
- "mm/vmpressure: reduce CPU, memory and code overhead on cgroup v2"
(Usama Arif)
Optimize vmpressure() by skipping unnecessary work on cgroup v2 for
userspace event notifications and refactor v1-only eventfd handling
into mm/memcontrol-v1.c to reduce memory overhead and code complexity
- "selftests/mm: refactor pkey helpers and fix mmap error handling"
(Hongfu Li)
Refactor pkeys shared tracing and assertion helpers into a common
file, unify protection key selftests to use consistent diagnostic
logging and assertions, and enforce standardized MAP_FAILED return
checks for mmap() calls across the tests
- "mm/damon: optimize out nr_accesses_bp" (SJ Park)
Replace the error-prone, continuously updated nr_accesses_bp field in
damon_region with an on-demand moving sum function, reducing
structure memory overhead and avoiding state corruption bugs
- "Open HugeTLB allocation routine for more generic use" (Ackerley Tng)
Decouple HugeTLB folio allocation from VMA dependencies by
introducing hugetlb_alloc_folio(), enabling subsystems like
guest_memfd to allocate HugeTLB folios without standard VMA
reservations or pseudo-VMAs
- "mm/damon: provide pseudo moving sum probe_hits" (SJ Park)
Integrate DAMON's probe_hits attribute counter into the pseudo moving
sum infrastructure, enabling real-time, online monitoring without
waiting for full aggregation intervals
- "mm: Some cleanups for page allocator APIs" (Brendan Jackman)
Simplify and refactor the page allocator entry points and flags by
unifying allocation paths, adding internal alloc_flags arguments, and
eliminating redundant __ prefixed alloc_pages variants.
- "Fix incorrect access of hugetlb pte entries" (Dev Jain)
Enforce the consistent use of huge_ptep_get() instead of ptep_get()
for HugeTLB entries and fixes an unaligned address issue in arm64's
huge_ptep_get() implementation
- "mm/damon: validate all parameters in the core" (SJ Park)
Consolidate parameter validation into the DAMON core specifically
within damon_start() and damon_commit_ctx() to centralize error
checking, eliminate caller-side redundant checks and to improve
maintenance efficiency
- "tools/mm/page_owner_sort: fix filtering and cleanup issues" (Yichong
Chen)
Rename is_need() to filter_record() for clearer return semantics, fix
per-record allocation memory leaks and bound output copies in
search_pattern() to address an existing buffer issue
- "memcg: bail out reclaim when memcg is dying" (Jiayuan Chen)
Mitigate a system-wide stall which occurs when a cgroup is removed
while one of its memory control files is doing synchronous reclaim
- "mm/memory-failure: add panic option for unrecoverable pages" (Breno
Leitao)
Introduce an opt-in vm.panic_on_unrecoverable_memory_failure sysctl
that immediately panics the kernel on unrecoverable memory errors in
kernel-owned pages to preserve error context and prevent delayed,
silent data corruption
- "mm/damon: refactor damon_{start,stop,commit}() for simple error
handling" (SJ Park)
Refactor the DAMON core API functions to guarantee that all contexts
are fully stopped when damon_start(), damon_stop(), or damon_commit()
fail, eliminating the need for complex and error-prone caller-side
cleanup code
- "Keep tail page private zero at free and folio split" (Zi Yan)
Add checks to ensure tail_page->private is zero when freeing compound
or high-order pages and when promoting tail pages during large folio
splits. By validating these fields at free and split time, it allows
the removal of redundant private field clearing inside
prep_compound_tail()
- "mm: drop redundant lru_add_drain in anon folio reuse paths" (Barry
Song)
Eliminate redundant lru_add_drain() calls in
wp_can_reuse_anon_folio() and do_swap_page() to reduce LRU lock
contention and system overhead
By validating folio refcounts against the LRU cache before draining
and removing unnecessary drains in the swap path, it achieves up to a
30.5% reduction in drain calls during heavy swap workloads
- "mm: clean up folio LRU and swap declarations" (Jianyue Wu)
Reorganize folio LRU and swap code by relocating page-cluster state
to mm/swap_state.c, renaming mm/swap.c to mm/folio.c, and moving
MM-internal reclaim declarations into mm/internal.h.
- "userfaultfd: working set tracking for VM guest memory" (Kiryl
Shutsemau)
Add userfaultfd support for tracking the working set of VM guest
memory, so a VMM can identify hot pages and reclaim cold ones to
tiered or remote storage
- "mm: remove CONFIG_HAVE_BOOTMEM_INFO_NODE (Part 2)" (David
Hildenbrand)
Remove the remaining pieces of CONFIG_HAVE_BOOTMEM_INFO_NODE,
performing some smaller cleanups around freeing of reserved vmemmap
pages on the way.
- "mm/damon: update probe hits for runtime parameter commits" (SJ Park)
Ensure that DAMON's probe_hits attribute counter is properly updated
when monitoring intervals are changed at runtime, matching the
behavior of nr_accesses. To achieve this, it refactors and renames
existing helper functions for shared use, applies the updates to
probe_hits, and handles edge cases in damon_probe_hits_mvsum() to
maintain measurement accuracy.
- "KSM: performance optimizations for rmap_walk_ksm" (xu xin)
Resolve a severe KSM reverse-mapping performance bottleneck where
thousands of split VMAs sharing a single anon_vma cause extended lock
contention.
By adding an interval-filtering check during the rmap walk, it
reduces worst-case anon_vma lock hold times from over 500ms down to
under 2ms, preventing application freezes and latency spikes under
memory pressure.
- "mm: split a couple of headers from internal.h" (Mike Rapoport)
Split declarations related to mm_init, memblock, vmalloc and sparse
into new headers
- "KSM: use linear_page_index in collect_procs_ksm()" (xu xin)
Apply the interval tree optimization from rmap_walk_ksm() to
collect_procs_ksm() to avoid iterating over non-matching VMAs during
KSM memory error handling.
It hoists loop-invariant address initialization and restricts the
anon_vma_interval_tree_foreach walk to a targeted page offset range,
reducing redundant checks and improving lookup efficiency.
- "selftests/mm: avoid false failures in hugetlb and KSM tests" (Sayali
Patil)
Fix issues in the hugetlb and KSM MM selftest categories that can
report failures when the prerequisites for the tests are not
satisfied
- "mm/damon: introduce data attributes only monitoring" (SJ Park)
Introduce attribute-weighted region management in DAMON, allowing
users to prioritize specific data attributes (such as page sizes or
cgroups) over or instead of access monitoring.
By assigning weights to attribute probes, DAMON can completely
disable access tracking and adjust monitoring regions based on
weighted probe-hit counters to optimize monitoring quality for
attribute-focused workloads.
- "mm/hmm: Add mmap lock-drop support for userfaultfd-backed mappings"
(Stanislav Kinsburskii)
Extend hmm_range_fault() to support userfaultfd-backed regions by
allowing the mmap lock to be dropped during fault handling via a new
hmm_range_fault_locked() helper.
By accepting a locked pointer and signaling retry status when lock
release occurs, it enables page fault resolution in userfaultfd
regions while preserving backward compatibility for existing callers.
- "mm: make VMA page offset handling more consistent" (Lorenzo Stoakes)
Clean up and standardize how vma->vm_pgoff is accessed and
manipulated across file-backed and anonymous mappings in the kernel
It introduces dedicated helper functions such as vma_start_pgoff(),
vma_end_pgoff(), vma_set_pgoff() and linear_page_delta() while
renaming rmap interval tree helpers to better reflect their
functionality.
These changes establish a cleaner foundation for future work that
will unify virtual page offset indexing for all anonymous and CoW'd
folios.
- "mm: handle device-private PMDs in walk callbacks" (Usama Arif)
Address kernel panics and state corruption caused by MM walk
callbacks reaching non-present device-private PMD swap entries
created during HMM migrations
It ensures that functions which acquire pmd_trans_huge_lock()
properly recognize device-private PMDs instead of assuming a present
THP or a standard migration entry.
- "mm/rmap: Refactor try_to_unmap_one" (Dev Jain)
Refactor try_to_unmap_one by modularizing Hugetlb,
anonymous-lazyfree, and anonymous-swapbacked logic into dedicated
functions, laying the structural groundwork for batched anonymous
large folio unmapping.
- "Docs/ABI/damon: sysfs ABI document fixes and additions" (Song Hu)
Fix typos and fills in missing entries in the DAMON sysfs ABI
document
- "dax/kmem: atomic whole-device hotplug via sysfs" (Gregory Price)
Introduce an atomic sysfs state attribute and supporting DAX/MM
infrastructure to prevent userland races when offlining and removing
entire memory regions
By adding an unplugged state alongside standard online modes, it
enables whole-device atomic hotplug control while preserving backward
compatibility.
- "mm: convert more vm_flags_t users to vma_flags_t" (Lorenzo Stoakes)
Continue transitioning the kernel from the deprecated vm_flags_t type
to vma_flags_t across core memory management infrastructure.
It replaces legacy type usage in core functions such as do_mmap(),
unmapped area allocation, mm->def_vma_flags, and VMA operations like
mlock, mprotect, and mremap.
- "Two small patches to clean up mm/mm_slot.h" (xu xin)
Refactor mm_slot.h by introducing mm_slot_remove() to unify duplicate
slot deletion sequences in khugepaged and KSM. It also adds code
documentation explaining why mm_slot_lookup and mm_slot_insert must
remain as preprocessor macros rather than static inline functions.
- "mm/damon/core: hide core-private struct fields" (SJ Park)
Clean up DAMON core structures by consistently marking internal-only
fields with private: comment tags to prevent improper direct access
from outer layers.
It enforces encapsulation across core structures including
damon_region, damon_target, and damon_ctx and updates DAMON_SYSFS to
interact through approved access APIs instead of exposing raw struct
members.
- "mm/damon: unurgent fixes for infinite loop, NULL de-ref and races"
(SJ Park)
Address potential infinite loops, NULL dereferences, and race
conditions identified in DAMON
It fixes an infinite loop triggered by extreme user configurations, a
NULL pointer dereference within unit tests and minor monitoring
accuracy degradation caused by subtle runtime races.
- "mm/page_alloc: fixes for free_pages_nolock() on RT/UP" (Brendan
Jackman)
Fix an NMI safety flaw in __free_frozen_pages() where freeing pages
on non-SMP or PREEMPT_RT kernels can bypass can_spin_trylock() checks
via non-PCP or isolated migration paths.
It also resolves potential kernel crashes and privilege escalation
risks triggered when BPF tracing runs in NMI context alongside memory
hotplug or large allocation frees.
- "mm/page_alloc: couple of followups for recent cleanups" (Brendan
Jackman)
Clean up and update page allocator nomenclature, documentation, and
debug assertions.
It aligns internal FPI_ flags with the public "nolock" naming
convention, removes outdated internal implementation details from
high-level page allocator comments, and eliminates obsolete
VM_BUG_ON() assertions in allocation paths.
- "mm/mseal: further cleanups" (Lorenzo Stoakes)
Refactor and simplify the mseal implementation by clarifying API
boundaries and removing unnecessary code complexity.
It replaces generic do_mseal() usage outside the syscall with a
dedicated mseal_mmap_page_zero() helper for MMAP_PAGE_ZERO,
eliminates mm_struct parameters to enforce that sealing applies only
to current->mm, and streamlines overall logic and comments with no
functional changes intended.
- "mm/vmscan: fix swappiness=max and clean up per-node proactive
reclaim" (Ridong Chen)
Resolve reclaim behavior bugs and clean up function parameters across
memory reclaim paths
It fixes swappiness=max in both standard reclaim and MGLRU so
unswappable anonymous memory no longer falls back to evicting page
cache, ensures reclaim_store() returns accurate error codes instead
of collapsing all failures into -EAGAIN, and removes the obsolete
gfp_mask parameter from __node_reclaim().
- "mm: mincore: misc cleanups" (Kefeng Wang)
Clean up and simplifies the mincore code. Most importantly, it
removes the historical special behavior that always reports VM_PFNMAP
pages as non-resident.
- "mm/huge_memory: drop dead split helper variants" (Kiryl Shutsemau)
Two trivial cleanups in the folio split API
- "mm/damon: fix uninitialized DAMOS field and kunit exec expectation
bugs" (SJ Park)
Resolve minor operational and testing bugs in DAMON identified by
Sashiko. It initializes the damos->last_applied field to prevent
occasional efficiency degradation and fixes invalid memory accesses
in DAMON KUnit tests during test failure handling.
- "cleanup for stable_page_flags()" (Jinjiang Tu)
Clean up and refactor stable_page_flags() used by /proc/kpageflags
without altering functionality.
It uses BIT_ULL() to prevent shift-overflow warnings on 64-bit flag
bits, converts folio-specific flag checks to standard folio_test_*()
helpers, and removes redundant CONFIG_PAGE_IDLE_FLAG handling.
- "Batch unmap of uffd-wp file folios" (Dev Jain)
Extend batched folio unmapping support to file folios within
userfaultfd write-protect (uffd-wp) VMAs by adding batching
capabilities to pte_install_uffd_wp_if_needed().
This removes special-case restrictions on uffd-wp VMAs in
try_to_unmap_one(), significantly simplifying the function's control
flow and complexity.
- "mm/early_ioremap: clarify and clean up early_ioremap_reset()"
(Sang-Heon Jeon)
Clarify and clean up the architecture-specific usage of
__late_set_fixmap() and __late_clear_fixmap() after
early_ioremap_reset()
It adds explicit documentation regarding when early_ioremap_reset()
must be called and removes redundant macro definitions and reset
calls in the RISC-V and ARM64 architectures.
- "mm: fix reclaim storms in defrag_mode" (Johannes Weiner)
Address severe performance regressions, swap storms, and spurious
OOMs caused by vm.defrag_mode=1 under high memory pressure in Meta
production
It updates the page allocator slowpath so non-movable allocation
requests actively trigger direct reclaim and direct compaction at
pageblock_order scale, allowing them to claim whole pageblocks rather
than spinning unproductively.
- "zram: lockmap tweaks" (Sebastian Siewior)
Optimize and fix lockdep tracking for zram devices by consolidating
per-entry lockmaps and isolate lock classes across multiple instances
This reduces memory overhead by replacing per-entry lockdep_map
instances with a single map per struct zram, and assigns a dynamic
lock_class_key to each instance to prevent false deadlock reports
when different zram devices are backed by distinct filesystems.
* tag 'mm-stable-2026-08-18-18-39' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (501 commits)
selftests/mm: thuge-gen: fix test_shmget() for PAGE_SIZE check
selftests/mm: unpoison pages in memory-failure teardown
mm/shmem: downgrade final i_blocks check in shmem_evict_inode() to pr_warn()
mm/khugepaged: replace mutex_lock/mutex_unlock usage with guard macro
mm/zsmalloc: fix release order of locks in zs_page_migrate()
Documentation: zram: remove sections numbering
ksm: stop iterating VMAs when ksm_test_exit returns true
mm: fold userfaultfd_rwp() to false without CONFIG_ARCH_HAS_PTE_PROTNONE
mm/migrate: report RCU-tasks quiescent states in migrate_pages_batch()
zram: use a custom key for each zram object
zram: move lockmap to be per-zram instead per table
selftests/mm: fix gup_longterm EINVAL error message
mm: page_alloc: fix non-movable reclaim storm in defrag_mode
mm: page_alloc: move capture_control to the page allocator
mm: compaction: support non-movable compaction for pageblock requests
mm: page_alloc: __GFP_FS lockdep annotation for direct compaction
hugetlb: evaluate subpool free state while locked
mm/damon: remove trailing semicolons after function definitions
mm/damon/ops-common: prevent migration fallback to non-target nodes
mm/damon: update outdated comment about DAMOS filter handling
...
|
||
|
Linus Torvalds
|
6439079365 |
Probes updates for v7.3:
- probes: Advanced BTF typecasting and variable fetch enhancements
. Typecast support across probe events: Extended BTF typecasting syntax
(e.g., (STRUCT)PARAM->MEMBER) to kprobes, uprobes, and fprobes on
function entry and return.
. Nested typecasts: Added support for chaining and nesting typecasts up
to 3 levels, including casting registers and stack variables.
. Field specifier option: Added (STRUCT,FIELD) syntax to emulate
container_of(), allowing retrieval of parent structures from member
pointers.
. $current variable support: Introduced $current special variable to
access the running task_struct via BTF dereferencing.
. Per-CPU variable access: Added this_cpu_read() and this_cpu_ptr()
fetcharg methods to trace CPU-local data safely.
. Fetcharg bytecode dumper: Added CONFIG_PROBE_EVENTS_DUMP_FETCHARG to
dump the compiled fetcharg bytecode instructions as comments in
dynamic_events.
. Extended symbol name handling: Removed the MAX_COMMON_HEAD_LEN limit
and extended MAX_ARGSTR_LEN to 256 bytes, enabling probing of long
symbols, mangled Rust symbols and complex BTF expressions.
. eprobe variable syntax: Allowed eprobes to reference event fields
directly without requiring a '$' prefix.
. Cleanup unused parameters, redundant codes, duplicate macros and
pointer arithmetic.
. Use a ternary operator for simplifying fetch_type_from_btf_type().
- bootconfig / boottime-trace: Expanded dynamic probe support
. Added boot-time tracing configuration support for event probes
(eprobes), function probes (fprobes), and tracepoint probes
(tprobes).
. ftrace2bootconfig: Allowed comment lines ('#') in dynamic_events file.
- fprobe / kprobe: Optimization, robustness, and cleanups
. fprobe: Simplified fprobe_remove_ips() by reusing graph and ftrace
helpers.
. fprobe: Removed __packed attribute from struct __fprobe_header to avoid
unaligned memory access penalties on RISC architectures.
. kprobe & fprobe: Removed redundant memset() calls in perf event probe
handlers.
. kprobes: Replaced legacy __ASSEMBLY__ with __ASSEMBLER__ in header
files.
- selftests & refactoring:
. Refactored parse_probe_arg() and parse_probe_vars(), and eliminated
recursion in probe argument parsing to protect kernel stack depth.
. Added selftests for BTF typecasts and module probing without module
prefixes.
. Forced LC_ALL=C in ftracetest to prevent test failures on localized
systems.
. Refactored btf_type_skip_modifiers() to remove ignored id parameter.
. Sorted ERRORS list in trace_probe.h alphabetically.
. Fixed typo in fprobe docs, and trace_fprobe function name.
. Renamed FETCH_OP_DATA to FETCH_OP_IMMSTR.
. Made file offset error message probe-agnostic.
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Merge tag 'probes-v7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull probes updates from Masami Hiramatsu:
"BTF typecasting and variable fetch enhancements:
- Typecast support across probe events: Extended BTF typecasting
syntax (e.g., (STRUCT)PARAM->MEMBER) to kprobes, uprobes, and
fprobes on function entry and return
- Nested typecasts: Added support for chaining and nesting typecasts
up to 3 levels, including casting registers and stack variables
- Field specifier option: Added (STRUCT,FIELD) syntax to emulate
container_of(), allowing retrieval of parent structures from member
pointers
- $current variable support: Introduced $current special variable to
access the running task_struct via BTF dereferencing
- Per-CPU variable access: Added this_cpu_read() and this_cpu_ptr()
fetcharg methods to trace CPU-local data safely
- Fetcharg bytecode dumper: Added CONFIG_PROBE_EVENTS_DUMP_FETCHARG
to dump the compiled fetcharg bytecode instructions as comments in
dynamic_events
- Extended symbol name handling: Removed the MAX_COMMON_HEAD_LEN
limit and extended MAX_ARGSTR_LEN to 256 bytes, enabling probing of
long symbols, mangled Rust symbols and complex BTF expressions
- eprobe variable syntax: Allowed eprobes to reference event fields
directly without requiring a '$' prefix
- Cleanup unused parameters, redundant codes, duplicate macros and
pointer arithmetic
- Use a ternary operator for simplifying fetch_type_from_btf_type()
Expanded boot time dynamic probe support:
- Add boot-time tracing configuration support for event probes
(eprobes), function probes (fprobes), and tracepoint probes
(tprobes)
- Allow comment lines ('#') in dynamic_events file
Optimization, robustness, and cleanups:
- Simplify fprobe_remove_ips() by reusing graph and ftrace helpers
- Remove __packed attribute from struct __fprobe_header to avoid
unaligned memory access penalties on RISC architectures
- Remove redundant memset() calls in perf event probe handlers
- Replace legacy __ASSEMBLY__ with __ASSEMBLER__ in header files
Selftests & refactoring:
- Refactor parse_probe_arg() and parse_probe_vars(), and eliminate
recursion in probe argument parsing to protect kernel stack depth
- Add selftests for BTF typecasts and module probing without module
prefixes
- Force LC_ALL=C in ftracetest to prevent test failures on localized
systems
- Refactor btf_type_skip_modifiers() to remove ignored id parameter
- Sort ERRORS list in trace_probe.h alphabetically
- Fix typo in fprobe docs, and trace_fprobe function name
- Rename FETCH_OP_DATA to FETCH_OP_IMMSTR
- Make file offset error message probe-agnostic"
* tag 'probes-v7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (37 commits)
fprobe: Simplify fprobe_remove_ips() by reusing existing helpers
tracing/boot: Add support for eprobe, fprobe, and tprobe events
selftests/ftrace: Force C locale in ftracetest
tracing/probes: Treating longer symbol name on event comparation
docs: trace: fprobe: fix 'thos' spelling
tracing/probes: Fix extra whitespace in trace_probe_kernel.h
tracing/kprobe: Remove redundant memset in kprobe_perf_func()
tracing/fprobe: Remove redundant memset in fentry_perf_func()
tracing/fprobe: Remove redundant snprintf in trace_fprobe_match_command_head()
tracing/probes: Simplify BTF_KIND_PTR case in fetch_type_from_btf_type()
tracing/probes: Cleanup pointer arithmetic in store_trace_entry_data()
tracing/probes: Remove unused parameter from parse_probe_var_retval()
tracing/probes: Remove redundant bounds check in trace_probe_compare_arg_type()
tracing/probes: Remove redundant boolean conversion in trace_probe_has_single_file()
tracing/probes: Remove duplicate MAX_ARRAY_LEN macro definition
selftests/ftrace: Add test case for a symbol in a module without module name
tracing/probes: Eliminate recursion in parse_probe_arg()
tracing/probes: Extend max length of argument string
tracing/probes: Sort ERRORS list in trace_probe.h alphabetically
tracing/probes: Refactor parse_probe_arg()
...
|
||
|
Linus Torvalds
|
ae814200e8 |
bitmap updates for v7.3
- bitmap_find_next_zero_area_off() optimization (Sunyi);
- bitmap_find_next_zero_area_off(): return size when no zero area is
found (Yury);
- bitmap vs IDA vs Maple Tree performance test (Yury);
- get rid of cpumap_print_to_pagebuf() (Yury);
- use nr_node_ids in __nodemask_pr_numnodes() (Li RongQing);
- bitops: make the *_bit_le functions use unsigned long (Benjamin);
- bitmap scatter & gather test fix (Christophe);
- use __ASSEMBLER__ in bitmap header files (Thomas);
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Merge tag 'bitmap-for-7.3' of https://github.com/norov/linux
Pull bitmap updates from Yury Norov:
"The usual set of fixes, cleanups and performance improvements together
with a couple of new tests:
- bitmap_find_next_zero_area_off() optimization (Sunyi)
- bitmap_find_next_zero_area_off(): return size when no zero area is
found (Yury)
- bitmap vs IDA vs Maple Tree performance test (Yury)
- get rid of cpumap_print_to_pagebuf() (Yury)
- use nr_node_ids in __nodemask_pr_numnodes() (Li RongQing)
- bitops: make the *_bit_le functions use unsigned long (Benjamin)
- bitmap scatter & gather test fix (Christophe)
- use __ASSEMBLER__ in bitmap header files (Thomas)"
* tag 'bitmap-for-7.3' of https://github.com/norov/linux: (25 commits)
lib: test bitmap vs IDA vs Maple Tree performance for region allocations
bitmap: Return size when no zero area is found
media: s5p-mfc: Treat bitmap size as allocation failure
crypto: ccp: Treat bitmap size as allocation failure
powerpc/msi: Treat bitmap size as allocation failure
ARM: dma-mapping: Treat bitmap size as allocation failure
bitmap: drop bitmap_next_set_region()
nodemask: reduce bitmap width to nr_node_ids in __nodemask_pr_numnodes()
bitmap: Properly initialise destination bitmap for scatter & gather test
lib/bitmap-str: get rid of cpumap_print_to_pagebuf()
perf: Use sysfs_emit() for cpumask show callbacks
PCI/sysfs: Use sysfs_emit() for cpumask show callbacks
RDMA/hfi1: Use sysfs_emit() for cpumask show helper
hwtracing: hisi_ptt: Use sysfs_emit() for cpumask show
fpga: dfl-fme-perf: Use sysfs_emit() for cpumask show
devfreq: Use sysfs_emit() for cpumask show callbacks
cpu: Use sysfs_emit() for cpumask show callback
x86/events: Use sysfs_emit() for cpumask show callbacks
powerpc: Use sysfs_emit() for cpumask show callbacks
arm: Use sysfs_emit() for cpumask show callbacks
...
|
||
|
Linus Torvalds
|
83453b6f51 |
audit/stable-7.3 PR 20260814
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||
|
Linus Torvalds
|
104a813376 |
VDSO updates:
- Consolidate the VDSO datastore further and provide support for
mlock_all() and prefaulting.
- Provide 32-bit legacy time related functionality only if
CONFIG_COMPAT_32BIT_TIME is enabled. The config switch exists, but
architecture code still exposes the legacy functionality even disabled.
Clean this up by adding the missing guards and validating at build time
that the VDSO is legacy free if disabled.
- Consolidate the VDSO related config options in core and drivers, which
removes some non-sensical dependencies and quite an amount of #ifdeffery.
- Clean up the PAGE_SIZE definition maze
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Merge tag 'timers-vdso-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull VDSO updates from Thomas Gleixner:
- Consolidate the VDSO datastore further and provide support for
mlock_all() and prefaulting.
- Provide 32-bit legacy time related functionality only if
CONFIG_COMPAT_32BIT_TIME is enabled. The config switch exists,
but architecture code still exposes the legacy functionality even
disabled.
Clean this up by adding the missing guards and validating at build
time that the VDSO is legacy free if disabled.
- Consolidate the VDSO related config options in core and drivers,
which removes some non-sensical dependencies and quite an amount of
#ifdeffery.
- Clean up the PAGE_SIZE definition maze
* tag 'timers-vdso-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
random: vDSO: Drop custom PAGE_SIZE definitions
LoongArch: Remove CONFIG_GENERIC_GETTIMEOFDAY ifdeffery
clocksource/drivers/timer-riscv: Remove CONFIG_GENERIC_GETTIMEOFDAY ifdeffery
clocksource/drivers/arm_arch_timer: Remove CONFIG_GENERIC_GETTIMEOFDAY ifdeffery
clocksource/drivers/mips-gic-timer: Remove CONFIG_GENERIC_GETTIMEOFDAY ifdeffery
MIPS: csrc-r4k: Remove CONFIG_GENERIC_GETTIMEOFDAY ifdeffery
vDSO: Make clockmode constants available without CONFIG_GENERIC_GETTIMEOFDAY
kbuild: Support generated asm-headers in subdirectories
vdso: Rename HAVE_GENERIC_VDSO to VDSO_DATASTORE
vdso: Drop HAVE_GENERIC_VDSO from architecture kconfig files
vdso: Automatically select HAVE_GENERIC_VDSO if necessary
MIPS: vdso: Stop using CONFIG_HAVE_GENERIC_VDSO
vdso: Remove the dependency on HAVE_GENERIC_VDSO from ARCH_HAS_VDSO_ARCH_DATA
futex: Remove dependency on HAVE_GENERIC_VDSO from FUTEX_ROBUST_UNLOCK
vdso/gettimeofday: Verify COMPAT_32BIT_TIME interactions
sparc: vdso: Respect COMPAT_32BIT_TIME
MIPS: VDSO: Respect COMPAT_32BIT_TIME
powerpc/vdso: Respect COMPAT_32BIT_TIME
ARM: VDSO: Respect COMPAT_32BIT_TIME
arm64: vdso32: Respect COMPAT_32BIT_TIME
...
|
||
|
Linus Torvalds
|
030c9f813b |
Treewide timer related cleanups:
- Remove the leftover CLOCK_TICK_RATE which has been scheduled for
removal more than a decade ago along with some now empty asm/timex.h
files.
- Consolidate delay timer calibration
The construct of having a define in a header requires that
architectures provided asm/timex.h for no reason. Also the function
name for reading the delay timer is confusing at best.
Use a config switch to enable that functionality and rename the
function to delay_read_timer() to make the purpose clear.
This removes some more now empty asm/timex.h files as well.
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Merge tag 'timers-cleanups-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull treewide timer related cleanups from Thomas Gleixner:
- Remove the leftover CLOCK_TICK_RATE which has been scheduled for
removal more than a decade ago along with some now empty asm/timex.h
files.
- Consolidate delay timer calibration
The construct of having a define in a header requires that
architectures provided asm/timex.h for no reason. Also the function
name for reading the delay timer is confusing at best.
Use a config switch to enable that functionality and rename the
function to delay_read_timer() to make the purpose clear.
This removes some more now empty asm/timex.h files as well.
* tag 'timers-cleanups-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
calibrate: Rework delay timer calibration
treewide: Remove CLOCK_TICK_RATE
x86: Use PIT_TICK_RATE instead of CLOCK_TICK_RATE
|
||
|
Linus Torvalds
|
3424d8c18a |
Generic entry code updates:
- Make syscall user dispatching configurable
Not all architectures can makes use of syscall user dispatching. Allow
them to disable the feature completely.
- Consolidate stack randomization for the generic entry code and the
architectures using it.
Stack randomization on syscall entry was sprinkled throughout the
architecture specific low level entry code and in some cases at the
wrong points, e.g. before establishing state, which violates the
non-instrumentable constraints of that code.
Clean this up by integrating stack randomization into the generic entry
code helpers so that it is invoked at the earliest possible point right
after establishing state and converting all generic entry code using
architecture over.
- Clean up the syscall number handling in the generic entry code. It
works correctly for architectures which have a separate return value
storage in pt_regs, but fails to distinguish the case where user space
handed in -1 as syscall number from the case where the entry code
rejects it by returning -1 to the callers. Aside of that the return
value functionality of those interfaces is not really intuitive.
Fix this by separating the decision to reject a syscall (user dispatch,
ptrace, seccomp ...) from the potential modification of the syscall
number through these mechanisms.
This solves most of the problems for architectures which do not have a
separate return value storage in pt_regs except for the case where a
tracepoint has a BPF script or a probe attached which overwrite both
the syscall number and the return value. But that's a problem which
cannot be solved in the generic code, that only can be addressed by
separating the storage model in the affected architectures.
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Merge tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull generic entry code updates from Thomas Gleixner:
- Make syscall user dispatching configurable
Not all architectures can makes use of syscall user dispatching.
Allow them to disable the feature completely.
- Consolidate stack randomization for the generic entry code and the
architectures using it.
Stack randomization on syscall entry was sprinkled throughout the
architecture specific low level entry code and in some cases at the
wrong points, e.g. before establishing state, which violates the
non-instrumentable constraints of that code.
Clean this up by integrating stack randomization into the generic
entry code helpers so that it is invoked at the earliest possible
point right after establishing state and converting all generic entry
code using architecture over.
- Clean up the syscall number handling in the generic entry code. It
works correctly for architectures which have a separate return value
storage in pt_regs, but fails to distinguish the case where user
space handed in -1 as syscall number from the case where the entry
code rejects it by returning -1 to the callers. Aside of that the
return value functionality of those interfaces is not really
intuitive.
Fix this by separating the decision to reject a syscall (user
dispatch, ptrace, seccomp ...) from the potential modification of the
syscall number through these mechanisms.
This solves most of the problems for architectures which do not have
a separate return value storage in pt_regs except for the case where
a tracepoint has a BPF script or a probe attached which overwrite
both the syscall number and the return value. But that's a problem
which cannot be solved in the generic code, that only can be
addressed by separating the storage model in the affected
architectures.
* tag 'core-entry-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
entry, treewide: Make syscall_enter_from_user_mode[_work]() indicate syscall execution
entry: Make return type of syscall_trace_enter() bool
entry: Rework trace_syscall_enter()
entry: Rework syscall_audit_enter()
syscall_user_dispatch: Introduce ARCH_SUPPORTS_SYSCALL_USER_DISPATCH
entry: Fix seccomp bypass after ptrace with TSYNC
x86/entry: Simplify the syscall number logic
x86/entry: Get rid of the sys_ni_syscall() indirection
x86/entry: Make syscall functions static
ptrace, treewide: Rename ptrace_report_syscall_entry() to ptrace_report_syscall_permit_entry()
seccomp, treewide: Rename and convert __secure_computing() to return boolean
entry: Use syscall number instead of rereading it
entry: Remove syscall_enter_from_user_mode()
x86/syscall: Use [syscall_]enter_from_user_mode_randomize_stack()
s390/syscall: Use enter_from_user_mode_randomize_stack()
riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack()
powerpc/syscall: Use syscall_enter_from_user_mode_randomize_stack()
loongarch/syscall: Use syscall_enter_from_user_mode_randomize_stack()
entry: Provide [syscall_]enter_from_user_mode_randomize_stack()
randomize_kstack: Provide add_random_kstack_offset_irqsoff()
...
|
||
|
Linus Torvalds
|
dfa35434d7 |
Locking updates for v7.3:
Futexes:
- Use runtime constants for futex_hash computation
(K Prateek Nayak, Peter Zijlstra)
- Optimise the size check get_futex_key() (Sebastian Andrzej Siewior)
- Avoid private hash use-after-free on final put (Felix Hoffmann)
- Tell kmemleak we're not leaking __futex_queues (Peter Zijlstra)
Rust integration updates:
- Implement refcounted interrupt disable and SpinLockIrq for Rust
(Boqun Feng, Heiko Carstens, Joel Fernandes, Lyude Paul)
- Rust sync: add helpers for mb, dma_mb and friends;
add generic memory barriers and use LKMM atomics
instead of Rust atomics in the revocable code (Gary Guo)
- Add abstraction and integrate synchronize_rcu() (Philipp Stanner)
Lock debugging:
- Add qspinlock contended_release tracepoint
(Dmitry Ilvokhin, Peter Zijlstra)
- Enable the printing of held locks of remote running tasks and print
task CPU (Ingo Molnar)
- percpu-rwsem: Annotate intentional data race in readers_active_check()
(Sun Shaojie)
Misc fixes and updates by Boqun Feng, Peter Zijlstra, Fangrui Song,
Naveen Kumar Chaudhary and Thomas Huth.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"Futexes:
- Use runtime constants for futex_hash computation (K Prateek Nayak,
Peter Zijlstra)
- Optimise the size check get_futex_key() (Sebastian Andrzej Siewior)
- Avoid private hash use-after-free on final put (Felix Hoffmann)
- Tell kmemleak we're not leaking __futex_queues (Peter Zijlstra)
Rust integration updates:
- Implement refcounted interrupt disable and SpinLockIrq for Rust
(Boqun Feng, Heiko Carstens, Joel Fernandes, Lyude Paul)
- Rust sync: add helpers for mb, dma_mb and friends; add generic
memory barriers and use LKMM atomics instead of Rust atomics in the
revocable code (Gary Guo)
- Add abstraction and integrate synchronize_rcu() (Philipp Stanner)
Lock debugging:
- Add qspinlock contended_release tracepoint (Dmitry Ilvokhin, Peter
Zijlstra)
- Enable the printing of held locks of remote running tasks and print
task CPU (Ingo Molnar)
- percpu-rwsem: Annotate intentional data race in readers_active_check()
(Sun Shaojie)
Misc fixes and updates by Boqun Feng, Peter Zijlstra, Fangrui Song,
Naveen Kumar Chaudhary and Thomas Huth"
* tag 'locking-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits)
rust: sync: Introduce SpinLockIrq::lock_with() and friends
rust: sync: Add SpinLockIrq
rust: sync: Use super::* in spinlock.rs
rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers
rust: Introduce interrupt module
s390/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS
arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS
preempt: Introduce HAS_SEPARATE_PREEMPT_RESCHED_BITS
sched: Avoid signed comparison of preempt_count() in __cant_migrate()
sched: Remove the unused preempt_offset parameter of __cant_sleep()
locking: Switch to _irq_{disable,enable}() variants in cleanup guards
irq: Add KUnit test for refcounted interrupt enable/disable
irq,spin_lock: Add counted interrupt disabling/enabling
openrisc: Include <linux/cpumask.h> in smp.h
preempt: Introduce __preempt_count_{sub,add}_return()
preempt: Introduce HARDIRQ_DISABLE_BITS
preempt: Track NMI nesting to separate per-CPU counter
futex: Tell kmemleak we're not leaking __futex_queues
x86/paravirt: Trace contended_release on unlock
tracing/lock: Use TRACE_EVENT_FN() for contended_release
...
|
||
|
Thomas Weißschuh
|
1bafc1f659 |
vDSO: Make clockmode constants available without CONFIG_GENERIC_GETTIMEOFDAY
Some code, for example clocksource drivers, may want to use the vDSO clockmode constants even when CONFIG_GENERIC_GETTIMEOFDAY=n. But the symbols are completely hidden in that case, making ugly ifdeffery necessary. Always provide the enum definitions. As not all architectures provide asm/vdso/clocksource.h, provide an empty stub in asm-generic for it. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://patch.msgid.link/20260724-vdso-arch-clockmodes-v4-2-ddbe447be860@linutronix.de |
||
|
Boqun Feng
|
4ad87eee54 |
preempt: Introduce __preempt_count_{sub,add}_return()
In order to use preempt_count() to track the interrupt disable nesting
level, __preempt_count_{add,sub}_return() are introduced, as their names
suggest, these primitives return the new value of the preempt_count()
after changing it. The following example shows the usage of it in
local_interrupt_disable():
// increase the HARDIRQ_DISABLE bit
new_count = __preempt_count_add_return(HARDIRQ_DISABLE_OFFSET);
// if it's the first-time increment, then disable the interrupt
// at hardware level.
if ((new_count & HARDIRQ_DISABLE_MASK) == HARDIRQ_DISABLE_OFFSET) {
local_irq_save(flags);
raw_cpu_write(local_interrupt_disable_state, flags);
}
Having these primitives will avoid a read of preempt_count() after
changing preempt_count() on certain architectures.
Signed-off-by: Boqun Feng <boqun@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com> # s390
Link: https://patch.msgid.link/20260804161447.84806-4-boqun@kernel.org
|
||
|
Dmitry Ilvokhin
|
f7e2cb6d49 |
locking/qspinlock: Add contended_release tracepoint
Unlike mutex and rw_semaphore, qspinlock has no owner field, so "perf
lock contention --lock-owner" cannot attribute a contended spinlock to
its holder. The waiter-side contention_begin event records that a
spinlock is contended, but not by whom. Firing contended_release in the
holder's context at unlock is the only way to capture the holder of a
contended spinlock.
Combine the contention check, trace call and release in an out-of-line
queued_spin_release_traced() so the compiler need not preserve the lock
pointer in a callee-saved register across the call.
The check in queued_spin_unlock() is paid on every unlock, even while
the tracepoint is disabled: a static-branch NOP on x86_64, and a few
more instructions to manage a stack frame elsewhere. Gate it behind
CONFIG_QUEUED_SPINLOCKS_TRACE_CONTENDED_RELEASE (default n) so nobody
pays for a tracepoint they do not use. Sleeping locks fire
contended_release regardless.
On x86 this generic path is used only with PARAVIRT_SPINLOCKS=n (e.g.
defconfig). PARAVIRT_SPINLOCKS=y kernels keep the paravirt static_call
unlock and are wired up separately.
All below are with the QUEUED_SPINLOCKS_TRACE_CONTENDED_RELEASE option
enabled.
_raw_spin_unlock(), x86_64 defconfig, GCC 11, tracepoint compiled in but
disabled. The unlock is the single 'movb'. The only instruction added to
the executed path is the 2-byte static-branch NOP. The CALL to the
traced helper and the JMP back are emitted out of line and are reached
only once the static branch is patched on:
endbr64 ; 4 bytes
xchg %ax,%ax ; 2 static-branch NOP
; (added)
movb $0x0,(%rdi) ; 3 unlock (single store)
A: decl %gs:__preempt_count ; 7
je B ; 2
jmp __x86_return_thunk ; 5
call queued_spin_release_traced ; 5 out of line, reached
; only when the
; tracepoint is on
jmp A ; 2 (added)
B: call __SCT__preempt_schedule ; 5
jmp __x86_return_thunk ; 5
Baseline is the same stream without the NOP and the out-of-line
CALL/JMP: 31 bytes vs 40 (+9 bytes).
Binary size impact on x86_64, defconfig: +680 bytes (+0.00%), since all
standard configs out-of-line unlock. Architectures with inlined unlock
(s390 (always), csky and loongarch (both when !PREEMPTION)) will see a
bigger increase in binary size.
On the same path (x86_64, PARAVIRT_SPINLOCKS=n) with the tracepoint
disabled, a _raw_spin_unlock()-heavy nginx workload [1] shows no
measurable difference between baseline and patched kernels in
throughput, latency, cycles, instructions, IPC, or L1 instruction-cache
misses (kernel and total): all deltas stay within run-to-run noise.
Unlike x86, on arm64 the frame setup code (STP, MOV and LDP) lands on
the executed path in addition to static-branch NOP. Binary size impact
on arm64, defconfig: +932 bytes (+0.00%).
The _raw_spin_unlock()-heavy nginx workload reflects the larger hot
path: L1 instruction-cache misses rise ~1.4% (kernel and total) and
instruction count ~0.4%, consistent with the per-unlock frame.
cpu_cycles, throughput and latency show no measurable change and are
within run-to-run noise.
Architectures with fully custom qspinlock implementations (e.g.
PowerPC) are not covered by this change.
[1]: https://lore.kernel.org/all/aiphFXe_TPNPxZ_n@shell.ilvokhin.com/
Signed-off-by: Dmitry Ilvokhin <d@ilvokhin.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://patch.msgid.link/0d998e22a0c595f670cfc6725bb683323aced5cb.1785778551.git.d@ilvokhin.com
|
||
|
Dmitry Ilvokhin
|
216c6c67f7 |
locking: Factor out queued_spin_release()
The contended_release tracepoint needs to hook queued_spin_unlock(), but architectures with a custom unlock define queued_spin_unlock() directly, leaving no single generic place to add the tracing. Introduce queued_spin_release() as the arch-overridable release primitive and make queued_spin_unlock() a generic wrapper around it. An architecture that only customizes the release can then override queued_spin_release() and inherit the generic wrapper. Rename the MIPS override to queued_spin_release() accordingly. x86 paravirt overrides queued_spin_unlock() directly and is left unchanged. No functional change intended. Signed-off-by: Dmitry Ilvokhin <d@ilvokhin.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Juergen Gross <jgross@suse.com> Link: https://patch.msgid.link/b8daabae6469ad72cc784a911f6cc43a6d45df3a.1785778551.git.d@ilvokhin.com |
||
|
Kiryl Shutsemau (Meta)
|
c0ffe79eed |
mm: rename uffd-wp PTE accessors to uffd
Userfaultfd RWP will reuse the uffd-wp PTE bit to mark access-tracking PTEs, alongside the write-protected ones it already marks. The bit's meaning now depends on the VMA flag (WP or RWP), not on its name. Rename the kernel-internal names that describe the bit: - pte/pmd/huge_pte accessors (and swap variants) - pgtable_supports_uffd() capability query - SCAN_PTE_UFFD khugepaged enum The ftrace string emitted by mm_khugepaged_scan_pmd for this enum is kept as "pte_uffd_wp" so existing trace-based tooling keeps matching. Pure mechanical rename -- no behavior change. Link: https://lore.kernel.org/20260708111417.173443-4-kirill@shutemov.name Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Assisted-by: Claude:claude-opus-4-6 Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: SeongJae Park <sj@kernel.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Hildenbrand <david@kernel.org> Cc: James Houghton <jthoughton@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Xu <peterx@redhat.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Josh Poimboeuf
|
029223d301 |
objtool/klp: Add .klp.symid for sympos disambiguation
Livepatch identifies a duplicate-named symbol by its position (sympos) among same-named kallsyms entries, which for vmlinux are counted in ascending address order in the final linked kernel. That order can't be reliably derived from vmlinux.o: the final link reorders sub-sections (.text.unlikely*, .data..*, etc). Bridge the gap with a new .klp.symid section which can be used to correlate symbols between vmlinux.o and vmlinux so that klp-diff can reliably determine the sympos. The table can't survive --gc-sections: keeping it alive would keep every duplicate-named symbol's section alive, so the reference kernel would stop matching the one which ships. klp-build rejects CONFIG_LD_DEAD_CODE_DATA_ELIMINATION instead. Nothing is lost today: x86_64 is the only HAVE_KLP_BUILD arch and doesn't select HAVE_LD_DEAD_CODE_DATA_ELIMINATION, arm64 and s390 have never selected it either, and on powerpc, it's still EXPERIMENTAL and disabled by every distro kernel. This is the build-time half of reliable vmlinux sympos computation; "objtool klp diff" will consume the table in a subsequent commit. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: live-patching@vger.kernel.org Link: https://patch.msgid.link/64d50f077b569f47883c015cdb7079edb068efe8.1785727106.git.jpoimboe@kernel.org |
||
|
Hui Zhu
|
67a06fdfbf |
mm: fix ASSERT_EXCLUSIVE_BITS by passing memdesc_flags_t by pointer
KCSAN reports a data race between page_to_nid()/folio_pgdat() reading page->flags and folio_trylock()/folio_lock() concurrently doing test_and_set_bit_lock(PG_locked, ...) on the same word, e.g.: BUG: KCSAN: data-race in __lruvec_stat_mod_folio / shmem_get_folio_gfp The race is benign: nid/zone bits are set once at page init and never overlap with PG_locked. However, ASSERT_EXCLUSIVE_BITS() inside memdesc_nid/zonenum() was checking a by-value copy of the flags word, not the live page->flags, so it failed to annotate the real access. Change memdesc_nid(), memdesc_zonenum(), memdesc_section(), and memdesc_is_zone_device() to take a const memdesc_flags_t * and update all callers to pass &page->flags / &folio->flags, so ASSERT_EXCLUSIVE_BITS() operates on the actual shared word. Guard the ASSERT_EXCLUSIVE_BITS() call in memdesc_zonenum() under ZONES_WIDTH != 0 to avoid a zero-mask check on configs where the zone field is absent. memdesc_section() needs no such guard, since SECTIONS_WIDTH is never 0 wherever SECTION_IN_PAGE_FLAGS is defined. Under CONFIG_NUMA=n, memdesc_nid() itself is stubbed to "return 0" instead of reading page->flags, since NODES_MASK is 0 and the check can never fire; page_to_nid()/folio_nid() now just call memdesc_nid() unconditionally and rely on that stub, instead of duplicating the CONFIG_NUMA split at each call site. [zhuhui@kylinos.cn: v11] Link: https://lore.kernel.org/20260708083308.747930-1-hui.zhu@linux.dev [ziy@nvidia.com: build fix] Link: https://lore.kernel.org/DJSGLP9VFLRI.355AAWR2VHIEL@nvidia.com Link: https://lore.kernel.org/20260630070810.470763-1-hui.zhu@linux.dev Signed-off-by: Hui Zhu <zhuhui@kylinos.cn> Co-developed-by: David Hildenbrand (Arm) <david@kernel.org> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Barry Song <baohua@kernel.org> Cc: Kairui Song <kasong@tencent.com> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Wei Xu <weixugc@google.com> Cc: Yuanchu Xie <yuanchu@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Mike Rapoport (Microsoft)
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4b9c548d9b | Merge branch 'mm-stable-6d098029de09' of https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm into kho-scratch | ||
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Peter Zijlstra
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b78b0b6582 |
futex: Use runtime constants for __futex_hash() hot path
Runtime constify the read-only after init data __futex_shift(shift_32),
__futex_mask(mask_32), and __futex_queues(ptr) used in __futex_hash()
hot path to avoid referencing global variable.
This also allows __futex_queues to be allocated dynamically to
"nr_node_ids" slots instead of reserving config dependent MAX_NUMNODES
(1 << CONFIG_NODES_SHIFT) worth of slots upfront.
Runtime constants are initialized before their first access and
runtime_const_init() provides necessary barrier to ensure subsequent
accesses are not reordered against their initialization.
No functional changes intended.
perf bench futex on a 3rd Gen EPYC (2 x 64C/128T):
+----------------+-----------+-----------+-----------+--------------+
| Benchmark | Kernel 1 | Kernel 2 | Unit | % Improvement|
| | (avg/5) | (avg/5) | | (K2 vs K1) |
+----------------+-----------+-----------+-----------+--------------+
| Wake-parallel | 0.01614 | 0.00456 | ms | +71.75% |
| Requeue | 0.26394 | 0.24644 | ms | +6.63% |
| Lock-pi | 34.0 | 57.2 | ops/sec | +68.24% |
+----------------+-----------+-----------+-----------+--------------+
Performance testing on a 144-thread Intel(R) Xeon(R) CPU E7-8890 v3 (4 NUMA nodes):
+-------------------------------------------------------------+
| perf bench futex hash -b 0 |
+----------------------+------------+------------+------------+
| Configuration | As-is | Patched | Delta |
+----------------------+------------+------------+------------+
| 1 thread, 1 futex | 6,449,632 | 6,532,004 | +1.28% |
| 144 threads, 1024 fx | 2,111,486 | 2,139,685 | +1.34% |
+----------------------+------------+------------+------------+i
[ prateek: Dynamically allocate __futex_queues, mark the global data
__ro_after_init since they are constified after futex_init(). ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> # MAX_NUMNODES bloat
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Link: https://patch.msgid.link/20260227161841.GH606826@noisy.programming.kicks-ass.net
Link: https://patch.msgid.link/20260728052540.4728-9-kprateek.nayak@amd.com
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Peter Zijlstra
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cb9362dddc |
asm-generic/runtime-const: Add dummy runtime_const_mask_32()
Add a dummy runtime_const_mask_32() for all the architectures that do not support runtime-const. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com> Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com> Link: https://patch.msgid.link/20260227161841.GH606826@noisy.programming.kicks-ass.net Link: https://patch.msgid.link/20260728052540.4728-8-kprateek.nayak@amd.com |
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Thomas Huth
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5339ec29f9 |
mm: replace __ASSEMBLY__ with __ASSEMBLER__ in memory management header files
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is a completely mechanical patch (done with a simple "sed -i" statement). Link: https://lore.kernel.org/20260619131830.229804-1-thuth@redhat.com Signed-off-by: Thomas Huth <thuth@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Barry Song <baohua@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Kairui Song <kasong@tencent.com> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Wei Xu <weixugc@google.com> Cc: Yuanchu Xie <yuanchu@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Benjamin Marzinski
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1c61b0a6e5 |
bitops: make the *_bit_le functions use unsigned long
The *_bit_le functions use a signed integer for the bit number. However, the *_bit functions can use an unsigned long. This causes problems if there is a large bitmap and a bit number > 0x80000000 is passed in. Since that is a negative int, it will get sign extended to a long when getting passed to the *_bit function, turning it into a huge bit number. This usually ends up with the memory address wrapping around and the function accessing memory before the start of the bitmap. Avoid this by making the *_bit_le functions take an unsigned long. This can be triggered by faking an almost 4TB dm-mirror device, which uses bitmaps to track the mirror regions: $ dmsetup create bigzero --table '0 8589934590 zero' $ dmsetup create mymirror --table '0 8589934590 mirror core 2 2 nosync 2 /dev/mapper/bigzero 0 /dev/mapper/bigzero 0' This will access memory before the start of the sync_bits bitmap, and likely hit the guard page of the previously allocated clean_bits bitmap, causing a kernel panic with the old code. I looked and didn't see any crazy code using the signed int to intentionally try and access bits before some address within the bitmap. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Yury Norov <ynorov@nvidia.com> |
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Thomas Gleixner
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dfc256dac5 |
calibrate: Rework delay timer calibration
The header define in asm/timex,h and the naming of the function to read the delay timer are confusing at best. Convert it to a config switch selected by the archictures which provide the functionality and rename the function to delay_read_timer(), which makes the purpose clear. Move the declaration to linux/delay.h where it belongs. Remove the resulting empty asm/timex.h files as well. No functional change. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260410120317.978403520@kernel.org |
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Thomas Gleixner
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622f04e974 |
ptrace, treewide: Rename ptrace_report_syscall_entry() to ptrace_report_syscall_permit_entry()
The return value of that function is boolean and tells the caller whether to permit the syscall processing or not. Rename the function so the purpose is clear and make the return type bool. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com> Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com> Reviewed-by: Radu Rendec <radu@rendec.net> Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Magnus Lindholm <linmag7@gmail.com> Link: https://patch.msgid.link/20260707190254.280015701@kernel.org |
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Pratyush Yadav (Google)
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08412b8c70 |
x86/setup: do not include kexec_handover.h from asm/setup.h
x86 asm/setup.h includes linux/kexec_handover.h. This is because it is used by setup.c and kaslr.c. But this inclusion is problematic. The header is included in many places, so it results in the KHO header being propagated there. Also, the setup header is used by realmode code. If KHO header includes things like mm.h, it causes a big dump of compilation failures. Nothing in setup.h uses anything from KHO. Remove the header from setup.h, and directly include it in setup.c. which does use things from KHO. Since kaslr.c is a part of the decompressor, avoid including linux headers there directly. Instead, split out struct kho_scratch, which is the only thing the kaslr.c uses, and move it to include/asm-generic/kexec_handover.h. This should also help reduce files recompiled when kexec_handover.h changes. Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org> Acked-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://patch.msgid.link/20260706153751.1166003-1-pratyush@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> |