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ed2a29dc6dcf4630ef19d588704c2ca7b46607bb
linux/mm
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Chenghao Duan ed2a29dc6d mm/memfd: use folio_nr_pages() for shmem inode accounting 
I found several modifiable points while reading the code.


This patch (of 6):

Patch series "Modify memfd_luo code", v3.

memfd_luo_retrieve_folios() called shmem_inode_acct_blocks() and
shmem_recalc_inode() with hardcoded 1 instead of the actual folio page
count.  memfd may use large folios (THP/hugepages), causing quota/limit
under-accounting and incorrect stat output.

Fix by using folio_nr_pages(folio) for both functions.

Issue found by AI review and suggested by Pratyush Yadav <pratyush@kernel.org>.
https://sashiko.dev/#/patchset/20260319012845.29570-1-duanchenghao%40kylinos.cn

Link: https://lore.kernel.org/20260326084727.118437-1-duanchenghao@kylinos.cn
Link: https://lore.kernel.org/20260326084727.118437-2-duanchenghao@kylinos.cn
Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
Suggested-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Haoran Jiang <jianghaoran@kylinos.cn>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-04-18 00:10:52 -07:00
..
damon
mm/damon/core: use time_in_range_open() for damos quota window start
2026-04-18 00:10:51 -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
mm: cma: set early_pfn and bitmap as a union in cma_memrange
2025-05-22 14:55:36 -07:00
compaction.c
mm: memcontrol: prepare for reparenting LRU pages for lruvec lock
2026-04-18 00:10:46 -07:00
debug_page_alloc.c
mm/debug_page_alloc: improve error message for invalid guardpage minorder
2025-05-12 23:50:38 -07:00
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
docs: dma-api: replace consistent with coherent
2025-07-01 13:25:36 -06:00
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
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: thp: prevent memory cgroup release in folio_split_queue_lock{_irqsave}()
2026-04-18 00:10:46 -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
mm/hugetlb: do pre-HVO for bootmem allocated pages
2025-03-16 22:06:29 -07:00
hugetlb.c
mm: move vma_mmu_pagesize() from hugetlb to vma.c
2026-04-05 13:53:23 -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
mm: rename cpu_bitmap field to flexible_array
2026-01-19 12:30:00 -08:00
internal.h
mm: add mmap_action_simple_ioremap()
2026-04-05 13:53:43 -07:00
interval_tree.c
mm/memory: simplify calculation in unmap_mapping_range_tree()
2026-04-05 13:53:13 -07:00
ioremap.c
mm/ioremap: pass pgprot_t to ioremap_prot() instead of unsigned long
2025-03-16 22:06:23 -07:00
Kconfig
mm: introduce CONFIG_NUMA_MIGRATION and simplify CONFIG_MIGRATION
2026-04-05 13:53:33 -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: fix issue with tracking lock
2026-04-05 13:53:47 -07:00
kmemleak.c
mm: kmemleak: add CONFIG_DEBUG_KMEMLEAK_VERBOSE build option
2026-04-18 00:10:48 -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
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
maccess.c
mm: unexport globally copy_to_kernel_nofault
2025-07-09 22:42:22 -07:00
madvise.c
mm/vma: convert vma_modify_flags[_uffd]() to use vma_flags_t
2026-04-05 13:53:41 -07:00
Makefile
Merge tag 'mm-nonmm-stable-2026-02-12-10-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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
kho: persist blob size in KHO FDT
2026-04-18 00:10:48 -07:00
memcontrol-v1.c
mm: memcontrol: eliminate the problem of dying memory cgroup for LRU folios
2026-04-18 00:10:47 -07:00
memcontrol-v1.h
mm: memcontrol: prepare for reparenting non-hierarchical stats
2026-04-18 00:10:47 -07:00
memcontrol.c
mm: memcontrol: correct the nr_pages parameter type of mem_cgroup_update_lru_size()
2026-04-18 00:10:48 -07:00
memfd_luo.c
mm/memfd: use folio_nr_pages() for shmem inode accounting
2026-04-18 00:10:52 -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
mm: introduce CONFIG_NUMA_MIGRATION and simplify CONFIG_MIGRATION
2026-04-05 13:53:33 -07:00
memory.c
mm: on remap assert that input range within the proposed VMA
2026-04-05 13:53:45 -07:00
mempolicy.c
mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()
2026-04-18 00:10:51 -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: prevent memory cgroup release in folio_migrate_mapping()
2026-04-18 00:10:45 -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: rename unlock_page_lruvec_irq and its variants
2026-04-18 00:10:44 -07:00
mm_init.c
mm: mark early-init static variables with __meminitdata
2026-04-05 13:53:34 -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: convert do_brk_flags() to use vma_flags_t
2026-04-05 13:53:40 -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: change to return bool for the MMU notifier's young flag check
2026-04-05 13:53:35 -07:00
mmzone.c
mm: introduce memdesc_flags_t
2025-09-13 16:55:07 -07:00
mprotect.c
mm: simplify VMA flag tests of excluded flags
2026-04-05 13:53:41 -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/vma: convert vma_modify_flags[_uffd]() to use vma_flags_t
2026-04-05 13:53:41 -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: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion
2025-08-20 16:31:23 +03:00
numa_memblks.c
Merge tag 'fixes-2026-02-21' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock
2026-02-21 09:58:22 -08:00
numa.c
mm/numa: remove unnecessary local variable in alloc_node_data()
2025-05-12 23:50:38 -07:00
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/alloc_tag: clear codetag for pages allocated before page_ext initialization
2026-04-18 00:10:50 -07:00
page_counter.c
page_counter: track failcnt only for legacy cgroups
2025-03-17 00:05:35 -07:00
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: page_io: prevent memory cgroup release in page_io module
2026-04-18 00:10:45 -07:00
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: fix race between concurrent split and refault
2026-04-05 13:53:37 -07:00
percpu-internal.h
…
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
mm: remove outdated filename comment in percpu-stats.c
2025-07-13 16:38:23 -07:00
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
Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2026-02-12 11:32:37 -08:00
rmap.c
mm/mglru: fix cgroup OOM during MGLRU state switching
2026-04-05 13:53:33 -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: memcontrol: remove dead code of checking parent memory cgroup
2026-04-18 00:10:44 -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: mark early-init static variables with __meminitdata
2026-04-05 13:53:34 -07:00
sparse.c
mm/sparse: fix preinited section_mem_map clobbering on failure path
2026-04-18 00:10:52 -07:00
swap_cgroup.c
mm: swap_cgroup: remove double initialization of locals
2025-03-17 22:06:58 -07:00
swap_state.c
mm/swap: fix swap cache memcg accounting
2026-04-05 13:53:37 -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
mm: vmscan: prepare for reparenting traditional LRU folios
2026-04-18 00:10:46 -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/vma: convert vma_modify_flags[_uffd]() to use vma_flags_t
2026-04-05 13:53:41 -07:00
util.c
mm/vma: remove __vma_check_mmap_hook()
2026-04-18 00:10:44 -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
Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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: add vm_ops->mapped hook
2026-04-05 13:53:43 -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: update outdated comment for renamed vread()
2026-04-05 13:53:34 -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: prevent MGLRU reclaim from pinning address space
2026-04-18 00:10:50 -07:00
vmstat.c
mm: vmalloc: streamline vmalloc memory accounting
2026-04-05 13:53:04 -07:00
workingset.c
mm: workingset: use lruvec_lru_size() to get the number of lru pages
2026-04-18 00:10:47 -07:00
zpdesc.h
mm: zpdesc: minor naming and comment corrections
2025-09-21 14:21:59 -07:00
zsmalloc.c
mm/zsmalloc: copy KMSAN metadata in zs_page_migrate()
2026-04-05 13:53:34 -07:00
zswap.c
mm: zswap: tie per-CPU acomp_ctx lifetime to the pool
2026-04-18 00:10:50 -07:00