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linux/mm
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Vivian Wang 4edd70ee6a mm/sparse-vmemmap: flush_cache_vmap() after hotplugging vmemmap 
section_activate() does not flush TLB after populating new vmemmap
pages. On most architectures, this is okay. However it is a problem on
RISC-V since there the TLB caching non-present entries is permitted,
which causes spurious faults on some hardwares.

This seems to be most easily reproduced with DEBUG_VM=y and
PAGE_POISONING=y, which causes these newly mapped struct pages to be
poisoned i.e. written to immediately after mapping.

Extend the RISC-V flush_cache_vmap() to also handle the vmemmap range,
and call it after hotplugging vmemmap, which gets the possible spurious
fault handled in the exception handler.

At least for now, the only other architecture with both
SPARSEMEM_VMEMMAP and flush_cache_vmap() is PowerPC, which has a similar
problem with newly valid PTEs. But there flush_cache_vmap() is just a
ptesync. So it should be safe to do this for generic code while having
minimal performance impact.

Suggested-by: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Link: https://patch.msgid.link/20260713-mark-after-vmemmap-populate-v6-2-b945ceba29d4@iscas.ac.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
2026-07-13 11:29:52 -06:00
..
damon mm/damon/ops-common: handle extreme intervals in damon_hot_score() 2026-07-01 19:02:53 -07:00
kasan mm.git review status for mm-hotfixes-stable..mm-stable 2026-06-19 10:14:34 -07:00
kfence slab changes for 7.2 - part 2 2026-06-22 08:28:48 -07:00
kmsan Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tests sparc/mm: export symbols for lazy_mmu_mode KUnit tests 2026-01-31 14:22:40 -08:00
backing-dev.c mm: blk-cgroup: fix use-after-free in cgwb_release_workfn() 2026-04-18 23:24:27 -07:00
balloon.c mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION 2026-01-31 14:22:36 -08:00
bootmem_info.c mm/bootmem_info: stop marking mem_section_usage as MIX_SECTION_INFO 2026-06-02 15:22:11 -07:00
bpf_memcontrol.c bpf: Revert "bpf: drop KF_ACQUIRE flag on BPF kfunc bpf_get_root_mem_cgroup()" 2026-01-21 09:38:16 -08:00
cma_debug.c mm/cma_debug: fix invalid accesses for inactive CMA areas 2026-05-28 20:50:33 -07:00
cma_sysfs.c mm/cma_sysfs: skip inactive CMA areas in sysfs 2026-06-03 16:25:49 -07:00
cma.c mm/cma: fix reserved page leak on activation failure 2026-05-28 20:50:34 -07:00
cma.h
compaction.c mm/compaction: handle free_pages_prepare() properly in compaction_free() 2026-07-01 19:02:53 -07:00
debug_page_alloc.c
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: replace WRITE_ONCE() with pxd_clear() 2026-04-05 13:53:11 -07:00
debug.c mm: constify __dump_folio() arguments 2025-11-20 13:43:57 -08:00
dmapool_test.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
dmapool.c
early_ioremap.c mm/early_ioremap: clean up the use of WARN() for debugging 2026-01-26 20:02:26 -08:00
execmem.c mm/execmem: make the populate and alloc atomic 2026-04-05 13:53:34 -07:00
fadvise.c mm/fadvise: validate offset in generic_fadvise 2026-04-05 13:52:53 -07:00
fail_page_alloc.c
failslab.c
filemap.c mm: do file ownership checks with the proper mount idmap 2026-07-01 19:02:56 -07:00
folio-compat.c mm: add SPDX id lines to some mm source files 2026-02-06 15:47:16 -08:00
gup_test.c mm/gup_test: reject wrapped user ranges 2026-06-21 11:37:37 -07:00
gup_test.h
gup.c mm/gup: cleanup pgtable entry accessors 2026-05-28 21:04:41 -07:00
highmem.c mm/highmem: fix __kmap_to_page() build error 2026-01-31 14:22:38 -08:00
hmm.c driver core: Replace dev->dma_skip_sync with dev_dma_skip_sync() 2026-04-26 23:38:57 +02:00
huge_memory.c mm.git review status for linus..mm-stable 2026-06-23 12:03:44 -07:00
hugetlb_cgroup.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hugetlb_cma.c mm/hugetlb_cma: restrict hugetlb_cma parameter to gigantic-page alignment 2026-06-02 15:22:16 -07:00
hugetlb_cma.h mm: hugetlb: allocate frozen pages for gigantic allocation 2026-01-26 20:02:28 -08:00
hugetlb_internal.h mm/hugetlb: extract sysctl into hugetlb_sysctl.c 2025-11-20 13:43:57 -08:00
hugetlb_sysctl.c mm, hugetlb: implement movable_gigantic_pages sysctl 2026-01-20 19:24:50 -08:00
hugetlb_sysfs.c mm/hugetlb: extract sysfs into hugetlb_sysfs.c 2025-11-20 13:43:57 -08:00
hugetlb_vmemmap.c mm/hugetlb_vmemmap: fix incorrect vmemmap restore in rollback 2026-05-31 21:50:24 -07:00
hugetlb_vmemmap.h
hugetlb.c Merge branch 'mm-hotfixes-stable' into mm-stable to pick up the series 2026-06-02 15:06:49 -07:00
hwpoison-inject.c mm/hwpoison: decouple hwpoison_filter from mm/memory-failure.c 2025-09-21 14:22:21 -07:00
init-mm.c exec_state: relocate dumpable information 2026-05-26 11:02:01 +02:00
internal.h mm: switch deferred split shrinker to list_lru 2026-06-08 18:21:25 -07:00
interval_tree.c mm/memory: simplify calculation in unmap_mapping_range_tree() 2026-04-05 13:53:13 -07:00
ioremap.c
Kconfig mm.git review status for linus..mm-stable 2026-06-23 12:03:44 -07:00
Kconfig.debug mm: kmemleak: add CONFIG_DEBUG_KMEMLEAK_VERBOSE build option 2026-04-18 00:10:48 -07:00
khugepaged.c mm/khugepaged: avoid underflow in madvise_collapse for sub-PMD MADV_COLLAPSE 2026-06-21 11:37:31 -07:00
kmemleak.c mm/kmemleak: dedupe verbose scan output by allocation backtrace 2026-05-28 21:05:09 -07:00
ksm.c mm: convert do_brk_flags() to use vma_flags_t 2026-04-05 13:53:40 -07:00
list_lru.c mm.git review status for mm-hotfixes-stable..mm-stable 2026-06-19 10:14:34 -07:00
maccess.c
madvise.c mm: do file ownership checks with the proper mount idmap 2026-07-01 19:02:56 -07:00
Makefile mm/memcg: remove no longer used swap cgroup array 2026-06-02 15:22:23 -07:00
mapping_dirty_helpers.c mm/dirty: replace READ_ONCE() with pudp_get() 2025-11-16 17:27:58 -08:00
memblock.c kho: fix deferred initialization of scratch areas 2026-06-01 02:31:37 +03:00
memcontrol-v1.c mm/memcg: remove no longer used swap cgroup array 2026-06-02 15:22:23 -07:00
memcontrol-v1.h mm: memcontrol: prepare for reparenting non-hierarchical stats 2026-04-18 00:10:47 -07:00
memcontrol.c slab changes for 7.2 - part 2 2026-06-22 08:28:48 -07:00
memfd_luo.c mm/memfd_luo: document preservation of file seals 2026-05-04 14:03:16 +00:00
memfd.c memfd: deny writeable mappings when implying SEAL_WRITE 2026-05-21 19:06:11 -07:00
memory_hotplug.c drivers/base/memory: make memory block get/put explicit 2026-06-02 15:22:12 -07:00
memory-failure.c mm/memory-failure: use zone_pcp_disable() for poison handling 2026-06-02 15:22:33 -07:00
memory-tiers.c mm: introduce CONFIG_NUMA_MIGRATION and simplify CONFIG_MIGRATION 2026-04-05 13:53:33 -07:00
memory.c mm: use mapping_mapped to simplify the code 2026-06-21 11:37:38 -07:00
mempolicy.c mm/nodemask: correctly describe nodemask operation return types 2026-06-08 18:21:23 -07:00
mempool.c mm: simplify the mempool_alloc_bulk API 2026-06-03 18:20:47 +02:00
memremap.c mm/sparse-vmemmap: pass @pgmap argument to memory deactivation paths 2026-05-28 21:04:54 -07:00
memtest.c mm/memtest: add underflow detection for size calculation 2026-01-09 11:53:51 +02:00
migrate_device.c mm/migrate_device: cleanup up PMD Checks and warnings 2026-05-28 21:04:47 -07:00
migrate.c mm/migrate: find_mm_struct: fix race between security checks and suid exec 2026-06-04 14:45:08 -07:00
mincore.c mm: do file ownership checks with the proper mount idmap 2026-07-01 19:02:56 -07:00
mlock.c mm: rename unlock_page_lruvec_irq and its variants 2026-04-18 00:10:44 -07:00
mm_init.c liveupdate: updates for 7.2-rc1 2026-06-21 09:46:14 -07:00
mm_slot.h
mmap_lock.c mm/vma: improve and document __is_vma_write_locked() 2026-01-31 14:22:51 -08:00
mmap.c mm: fix mmap errno value when MAP_DROPPABLE is not supported 2026-05-28 21:04:48 -07:00
mmu_gather.c mm/mmu_gather: replace IPI with synchronize_rcu() when batch allocation fails 2026-04-05 13:53:05 -07:00
mmu_notifier.c mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
mmzone.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
mprotect.c mm/mprotect: special-case small folios when applying permissions 2026-04-18 00:10:55 -07:00
mremap.c mm: convert do_brk_flags() to use vma_flags_t 2026-04-05 13:53:40 -07:00
mseal.c mm/mseal: use min/max in mseal_apply 2026-06-02 15:22:15 -07:00
msync.c
nommu.c mm: abstract reading sysctl_max_map_count, and READ_ONCE() 2026-04-05 13:53:28 -07:00
numa_emulation.c mm/fake-numa: fix under-allocation detection in uniform split 2026-06-02 08:34:03 +03:00
numa_memblks.c memblock: numa_memblks: fix detection of NUMA node for CXL windows 2026-02-21 09:58:22 -08:00
numa.c
oom_kill.c mm/oom_kill.c: simpilfy rcu call with guard(rcu) 2026-04-05 13:53:17 -07:00
page_alloc.c mm/page_alloc: only update NUMA min ratios on sysctl write 2026-06-21 11:31:29 -07:00
page_counter.c
page_ext.c mm/page_ext: Add page_ext_get_from_phys() 2026-01-21 12:51:48 +01:00
page_frag_cache.c
page_idle.c mm/page_idle.c: remove redundant mmu notifier in aging code 2026-04-05 13:53:02 -07:00
page_io.c block-7.2-20260625 2026-06-25 09:56:47 -07:00
page_isolation.c mm: page_isolation: avoid unsafe folio reads while scanning compound pages 2026-06-21 11:37:36 -07:00
page_owner.c mm/page_owner: fix %pGp format specifier argument type 2026-05-28 21:04:48 -07:00
page_poison.c
page_reporting.c mm/page_reporting: change page_reporting_order to PAGE_REPORTING_ORDER_UNSPECIFIED 2026-04-05 13:53:17 -07:00
page_reporting.h
page_table_check.c mm/page_table_check: Pass mm_struct to pxx_user_accessible_page() 2026-03-13 00:07:47 +01:00
page_vma_mapped.c mm/page_vma_mapped_walk: use ptep_get_lockless() for lockless access 2026-06-08 18:21:26 -07:00
page-writeback.c vfs-7.2-rc1.writeback 2026-06-15 03:30:45 +05:30
pagewalk.c mm/pagewalk: fix race between concurrent split and refault 2026-04-05 13:53:37 -07:00
percpu-internal.h mm/percpu-internal.h: optimise pcpu_chunk struct to save memory 2026-06-02 15:22:13 -07:00
percpu-km.c mm/mm/percpu-km: drop nth_page() usage within single allocation 2025-09-21 14:22:04 -07:00
percpu-stats.c
percpu-vm.c kmsan: remove hard-coded GFP_KERNEL flags 2025-11-16 17:27:54 -08:00
percpu.c mm: memcontrol: return root object cgroup for root memory cgroup 2026-04-18 00:10:44 -07:00
pgalloc-track.h
pgtable-generic.c mm: change to return bool for pmdp_clear_flush_young() 2026-04-05 13:53:35 -07:00
process_vm_access.c
ptdump.c mm/ptdump: replace READ_ONCE() with standard page table accessors 2025-11-16 17:27:52 -08:00
readahead.c Revert "mm: limit filemap_fault readahead to VMA boundaries" 2026-06-21 11:37:38 -07:00
rmap.c mm: remove page_mapped() 2026-05-28 21:04:57 -07:00
rodata_test.c
secretmem.c libfs: drop redundant SB_I_NOEXEC/SB_I_NODEV in init_pseudo() callers 2026-06-04 10:10:49 +02:00
shmem_quota.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
shmem.c mm.git review status for mm-hotfixes-stable..mm-stable 2026-06-19 10:14:34 -07:00
show_mem.c mm: add gpu active/reclaim per-node stat counters (v2) 2026-04-08 06:52:47 +10:00
shrinker_debug.c mm: shrinker: fix NULL pointer dereference in debugfs 2026-07-01 19:02:52 -07:00
shrinker.c mm: shrinker: fix shrinker_info teardown race with expansion 2026-07-01 19:02:52 -07:00
shuffle.c
shuffle.h
slab_common.c slab changes for 7.2 2026-06-16 08:44:43 +05:30
slab.h mm/slab: remove __GFP_NO_OBJ_EXT usage from alloc_slab_obj_exts() 2026-06-18 10:40:32 +02:00
slub.c slab changes for 7.2 - part 2 2026-06-22 08:28:48 -07:00
sparse-vmemmap.c mm/sparse-vmemmap: flush_cache_vmap() after hotplugging vmemmap 2026-07-13 11:29:52 -06:00
sparse.c mm/sparse: remove sparse buffer pre-allocation mechanism 2026-05-28 21:04:49 -07:00
swap_state.c mm: switch deferred split shrinker to list_lru 2026-06-08 18:21:25 -07:00
swap_table.h mm, swap: merge zeromap into swap table 2026-06-02 15:22:23 -07:00
swap.c mm/mglru: use folio_mark_accessed to replace folio_set_active 2026-06-04 14:45:02 -07:00
swap.h mm, swap: merge zeromap into swap table 2026-06-02 15:22:23 -07:00
swapfile.c mm/swap: remove redundant swap device reference in alloc/free 2026-06-08 18:21:32 -07:00
truncate.c mm/truncate: use folio_split() in truncate_inode_partial_folio() 2026-06-21 11:37:16 -07:00
usercopy.c usercopy: Remove folio references from check_heap_object() 2025-11-13 11:01:08 +01:00
userfaultfd.c userfaultfd: gate must_wait writability check on pte_present() 2026-06-08 18:21:29 -07:00
util.c mm/vma: eliminate mmap_action->error_hook, introduce error_override 2026-06-04 14:45:00 -07:00
vma_exec.c mm: convert do_brk_flags() to use vma_flags_t 2026-04-05 13:53:40 -07:00
vma_init.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
vma_internal.h mm: relocate the page table ceiling and floor definitions 2026-02-12 15:42:53 -08:00
vma.c drivers/char/mem: eliminate unnecessary use of success_hook 2026-06-04 14:44:59 -07:00
vma.h mm: allow handling of stacked mmap_prepare hooks in more drivers 2026-04-05 13:53:44 -07:00
vmalloc.c mm/vmalloc: free unused pages on vrealloc() shrink 2026-06-02 15:22:32 -07:00
vmpressure.c mm/vmpressure: skip socket pressure for costly order reclaim 2026-05-28 21:04:50 -07:00
vmscan.c mm.git review status for linus..mm-stable 2026-06-23 12:03:44 -07:00
vmstat.c mm.git review status for linus..mm-stable 2026-04-19 08:01:17 -07:00
workingset.c mm/mglru: use folio_mark_accessed to replace folio_set_active 2026-06-04 14:45:02 -07:00
zpdesc.h mm: zpdesc: minor naming and comment corrections 2025-09-21 14:21:59 -07:00
zsmalloc.c zsmalloc: simplify data output in zs_stats_size_show() 2026-06-21 11:31:28 -07:00
zswap.c mm, swap: add support for stable large allocation in swap cache directly 2026-06-02 15:22:21 -07:00