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dac89b150b
linux/mm
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David Hildenbrand (Arm) dac89b150b mm/sparse: remove CONFIG_MEMORY_HOTPLUG-specific usemap allocation handling 
In 2008, we added through commit 48c906823f ("memory hotplug: allocate
usemap on the section with pgdat") quite some complexity to try allocating
memory for the "usemap" (storing pageblock information per memory section)
for a memory section close to the memory of the "pgdat" of the node.

The goal was to make memory hotunplug of boot memory more likely to
succeed.  That commit also added some checks for circular dependencies
between two memory sections, whereby two memory sections would contain
each others usemap, turning both boot memory sections un-removable.

However, in 2010, commit a4322e1bad ("sparsemem: Put usemap for one node
together") started allocating the usemap for multiple memory sections on
the same node in one chunk, effectively grouping all usemap allocations of
the same node in a single memblock allocation.

We don't really give guarantees about memory hotunplug of boot memory, and
with the change in 2010, it is impossible in practice to get any circular
dependencies.

So let's simply remove this complexity.

Link: https://lkml.kernel.org/r/20260320-sparsemem_cleanups-v2-10-096addc8800d@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
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>
2026-04-05 13:53:32 -07:00
..
damon mm/damon/lru_sort: respect addr_unit on default monitoring region setup 2026-04-05 13:53:29 -07:00
kasan kasan: fix bug type classification for SW_TAGS mode 2026-04-05 13:53:18 -07:00
kfence kfence: add kfence.fault parameter 2026-04-05 13:53:06 -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 treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
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: avoid using sparse_decode_mem_map() 2026-04-05 13:53:32 -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 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cma_sysfs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cma.c mm/cma: move put_page_testzero() out of VM_WARN_ON in cma_release() 2026-03-04 09:44:22 -08:00
cma.h
compaction.c mm/compaction: fix low_pfn advance on isolating hugetlb 2025-09-28 11:51:29 -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: remove PMD alignment constraint in execmem_vmalloc() 2025-09-28 11:51:31 -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 folio_batch: rename pagevec.h to folio_batch.h 2026-04-05 13:53:07 -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: add SPDX id lines to some mm source files 2026-02-06 15:47:16 -08:00
gup_test.h
gup.c folio_batch: rename pagevec.h to folio_batch.h 2026-04-05 13:53:07 -07:00
highmem.c mm/highmem: fix __kmap_to_page() build error 2026-01-31 14:22:38 -08:00
hmm.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
huge_memory.c mm: introduce is_pmd_order helper 2026-04-05 13:53:29 -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: mark hugetlb_cma{_only} as __ro_after_init 2026-01-31 14:22:43 -08:00
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: remove hugetlb_optimize_vmemmap_key static key 2026-04-05 13:53:09 -07:00
hugetlb_vmemmap.h
hugetlb.c mm: move vma_mmu_pagesize() from hugetlb to vma.c 2026-04-05 13:53:23 -07:00
hwpoison-inject.c
init-mm.c mm: rename cpu_bitmap field to flexible_array 2026-01-19 12:30:00 -08:00
internal.h mm: abstract reading sysctl_max_map_count, and READ_ONCE() 2026-04-05 13:53:28 -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/Kconfig: make CONFIG_MEMORY_HOTPLUG depend on CONFIG_SPARSEMEM_VMEMMAP 2026-04-05 13:53:31 -07:00
Kconfig.debug mm: fix DEBUG_RODATA_TEST indentation in Kconfig 2025-11-29 10:41:09 -08:00
khugepaged.c mm/khugepaged: unify khugepaged and madv_collapse with collapse_single_pmd() 2026-04-05 13:53:30 -07:00
kmemleak.c mm/kmemleak: use PF_KTHREAD flag to detect kernel threads 2026-04-05 13:53:02 -07:00
ksm.c ksm: initialize the addr only once in rmap_walk_ksm 2026-04-05 13:52:35 -07:00
list_lru.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
maccess.c
madvise.c mm: rename zap_page_range_single() to zap_vma_range() 2026-04-05 13:53:15 -07:00
Makefile mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
mapping_dirty_helpers.c mm/dirty: replace READ_ONCE() with pudp_get() 2025-11-16 17:27:58 -08:00
memblock.c memblock: updates for 7.0-rc1 2026-02-14 12:39:34 -08:00
memcontrol-v1.c memcg: consolidate private id refcount get/put helpers 2026-04-05 13:53:00 -07:00
memcontrol-v1.h memcg: consolidate private id refcount get/put helpers 2026-04-05 13:53:00 -07:00
memcontrol.c mm: memcg: separate slab stat accounting from objcg charge cache 2026-04-05 13:53:17 -07:00
memfd_luo.c mm: memfd_luo: preserve file seals 2026-04-05 13:53:00 -07:00
memfd.c memfd: export memfd_{add,get}_seals() 2026-04-05 13:53:00 -07:00
memory_hotplug.c mm/memory_hotplug: simplify check_pfn_span() 2026-04-05 13:53:31 -07:00
memory-failure.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
memory-tiers.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
memory.c mm: introduce is_pmd_order helper 2026-04-05 13:53:29 -07:00
mempolicy.c mm: introduce is_pmd_order helper 2026-04-05 13:53:29 -07:00
mempool.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
memremap.c mm/zone_device: reinitialize large zone device private folios 2026-01-26 19:03:48 -08:00
memtest.c mm/memtest: add underflow detection for size calculation 2026-01-09 11:53:51 +02:00
migrate_device.c mm/migrate_device: document folio_get requirement before frozen PMD split 2026-04-05 13:53:19 -07:00
migrate.c mm: migrate: requeue destination folio on deferred split queue 2026-04-05 13:53:27 -07:00
mincore.c mm: replace remaining pte_to_swp_entry() with softleaf_from_pte() 2025-11-24 15:08:52 -08:00
mlock.c mm: prevent droppable mappings from being locked 2026-04-05 13:53:25 -07:00
mm_init.c mm: change the interface of prep_compound_tail() 2026-04-05 13:53:07 -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: abstract reading sysctl_max_map_count, and READ_ONCE() 2026-04-05 13:53:28 -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/mmu_notifiers: use hlist_for_each_entry_srcu() for SRCU list traversal 2026-04-05 13:53:02 -07:00
mmzone.c
mprotect.c mm/pkeys: remove unused tsk parameter from arch_set_user_pkey_access() 2026-04-05 13:52:57 -07:00
mremap.c mm/khugepaged: rename hpage_collapse_* to collapse_* 2026-04-05 13:53:30 -07:00
mseal.c mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
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
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: introduce is_pmd_order helper 2026-04-05 13:53:29 -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 mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
page_isolation.c mm: page_isolation: introduce page_is_unmovable() 2026-01-31 14:22:42 -08:00
page_owner.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
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: provide address parameter to p{te,md,ud}_user_accessible_page() 2026-01-26 20:02:35 -08:00
page_vma_mapped.c mm: centralize+fix comments about compound_mapcount() in new sync_with_folio_pmd_zap() 2026-04-05 13:53:03 -07:00
page-writeback.c mm: rename zap_vma_pages() to zap_vma() 2026-04-05 13:53:14 -07:00
pagewalk.c mm/pagewalk: drop FW_MIGRATION 2026-04-05 13:53:10 -07:00
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c kmsan: remove hard-coded GFP_KERNEL flags 2025-11-16 17:27:54 -08:00
percpu.c percpu: add double free check to pcpu_free_area() 2026-01-31 14:22:52 -08:00
pgalloc-track.h
pgtable-generic.c compiler-context-analysis: Remove __cond_lock() function-like helper 2026-01-05 16:43:33 +01:00
process_vm_access.c mm: refactor mm_access() to not return NULL 2024-11-05 16:56:23 -08:00
ptdump.c mm/ptdump: replace READ_ONCE() with standard page table accessors 2025-11-16 17:27:52 -08:00
readahead.c mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
rmap.c mm: support batched checking of the young flag for MGLRU 2026-04-05 13:53:16 -07:00
rodata_test.c
secretmem.c mm: rename VMA flag helpers to be more readable 2026-04-05 13:53:18 -07:00
shmem_quota.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
shmem.c mm: introduce is_pmd_order helper 2026-04-05 13:53:29 -07:00
show_mem.c mm/vmscan: add tracepoint and reason for kswapd_failures reset 2026-01-31 14:22:38 -08:00
shrinker_debug.c memcg: rename mem_cgroup_ino() to mem_cgroup_id() 2026-01-26 20:02:25 -08:00
shrinker.c mm: do not allocate shrinker info with cgroup.memory=nokmem 2026-04-05 13:53:05 -07:00
shuffle.c
shuffle.h
slab_common.c Merge branch 'slab/for-7.0/sheaves' into slab/for-next 2026-02-10 09:10:00 +01:00
slab.h mm/slab: use compound_head() in page_slab() 2026-04-05 13:53:10 -07:00
slub.c slab: fix memory leak when refill_sheaf() fails 2026-03-11 17:55:26 +01:00
sparse-vmemmap.c mm/hugetlb: remove fake head pages 2026-04-05 13:53:09 -07:00
sparse.c mm/sparse: remove CONFIG_MEMORY_HOTPLUG-specific usemap allocation handling 2026-04-05 13:53:32 -07:00
swap_cgroup.c
swap_state.c folio_batch: rename PAGEVEC_SIZE to FOLIO_BATCH_SIZE 2026-04-05 13:53:07 -07:00
swap_table.h mm, swap: use the swap table to track the swap count 2026-04-05 13:52:59 -07:00
swap.c folio_batch: rename PAGEVEC_SIZE to FOLIO_BATCH_SIZE 2026-04-05 13:53:07 -07:00
swap.h mm, swap: no need to clear the shadow explicitly 2026-04-05 13:52:59 -07:00
swapfile.c mm/swapfile: remove duplicate include of swap_table.h 2026-04-05 13:53:31 -07:00
truncate.c folio_batch: rename PAGEVEC_SIZE to FOLIO_BATCH_SIZE 2026-04-05 13:53:07 -07:00
usercopy.c usercopy: Remove folio references from check_heap_object() 2025-11-13 11:01:08 +01:00
userfaultfd.c mm/userfaultfd: fix hugetlb fault mutex hash calculation 2026-04-05 13:53:29 -07:00
util.c mm: rework compound_head() for power-of-2 sizeof(struct page) 2026-04-05 13:53:08 -07:00
vma_exec.c mm: softdirty: add pgtable_supports_soft_dirty() 2025-11-24 15:08:54 -08:00
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 mm: abstract reading sysctl_max_map_count, and READ_ONCE() 2026-04-05 13:53:28 -07:00
vma.h mm: make vm_area_desc utilise vma_flags_t only 2026-02-12 15:42:59 -08:00
vmalloc.c vmalloc: support __GFP_RETRY_MAYFAIL and __GFP_NORETRY 2026-04-05 13:53:12 -07:00
vmpressure.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vmscan.c mm/vmscan: fix unintended mtc->nmask mutation in alloc_demote_folio() 2026-04-05 13:53:18 -07:00
vmstat.c mm: vmalloc: streamline vmalloc memory accounting 2026-04-05 13:53:04 -07:00
workingset.c mm/workingset: leave highest bits empty for anon shadow 2026-04-05 13:52:58 -07:00
zpdesc.h
zsmalloc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
zswap.c mm/zswap: remove SWP_SYNCHRONOUS_IO swapcache bypass workaround 2026-04-05 13:53:02 -07:00