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Yin Fengwei bd20e20c4d madvise:madvise_free_pte_range(): don't use mapcount() against large folio for sharing check 
commit 0e0e9bd5f7b9d40fd03b70092367247d52da1db0 upstream.

Commit 98b211d6415f ("madvise: convert madvise_free_pte_range() to use a
folio") replaced the page_mapcount() with folio_mapcount() to check
whether the folio is shared by other mapping.

It's not correct for large folios. folio_mapcount() returns the total
mapcount of large folio which is not suitable to detect whether the folio
is shared.

Use folio_estimated_sharers() which returns a estimated number of shares.
That means it's not 100% correct. It should be OK for madvise case here.

User-visible effects is that the THP is skipped when user call madvise.
But the correct behavior is THP should be split and processed then.

NOTE: this change is a temporary fix to reduce the user-visible effects
before the long term fix from David is ready.

Link: https://lkml.kernel.org/r/20230808020917.2230692-4-fengwei.yin@intel.com
Fixes: 98b211d6415f ("madvise: convert madvise_free_pte_range() to use a folio")
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-30 16:11:11 +02:00
..
damon
mm/damon/ops-common: atomically test and clear young on ptes and pmds
2023-07-19 16:22:11 +02:00
kasan
kasan: add kasan_tag_mismatch prototype
2023-07-23 13:49:32 +02:00
kfence
mm: kfence: fix handling discontiguous page
2023-04-13 16:55:30 +02:00
kmsan
mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush()
2023-04-26 14:28:41 +02:00
backing-dev.c
writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs
2023-04-26 14:28:39 +02:00
balloon_compaction.c
mm: Convert all PageMovable users to movable_operations
2022-08-02 12:34:03 -04:00
bootmem_info.c
bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
2022-08-28 14:02:45 -07:00
cma_debug.c
mm/cma_debug: show complete cma name in debugfs directories
2022-09-11 20:25:50 -07:00
cma_sysfs.c
…
cma.c
Revert "mm/cma.c: remove redundant cma_mutex lock"
2022-05-13 15:11:26 -07:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
Revert "mm/compaction: fix set skip in fast_find_migrateblock"
2023-02-01 08:34:49 +01:00
debug_page_ref.c
…
debug_vm_pgtable.c
docs: rename Documentation/vm to Documentation/mm
2022-06-27 12:52:53 -07:00
debug.c
mm: remove the vma linked list
2022-09-26 19:46:26 -07:00
dmapool.c
…
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
riscv: compat: syscall: Add compat_sys_call_table implementation
2022-04-26 13:36:25 -07:00
failslab.c
mm: fix unexpected changes to {failslab|fail_page_alloc}.attr
2022-11-22 18:50:44 -08:00
filemap.c
mm/filemap: fix page end in filemap_get_read_batch
2023-02-22 12:59:49 +01:00
folio-compat.c
mm: remove try_to_free_swap()
2022-10-03 14:02:53 -07:00
frontswap.c
frontswap: don't call ->init if no ops are registered
2022-09-26 12:14:34 -07:00
gup_test.c
mm: rename is_pinnable_page() to is_longterm_pinnable_page()
2022-07-17 17:14:27 -07:00
gup_test.h
…
gup.c
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
highmem.c
highmem: fix kmap_to_page() for kmap_local_page() addresses
2022-10-12 18:51:51 -07:00
hmm.c
mm/swap: add swp_offset_pfn() to fetch PFN from swap entry
2022-09-26 19:46:05 -07:00
huge_memory.c
mm/huge_memory.c: warn with pr_warn_ratelimited instead of VM_WARN_ON_ONCE_FOLIO
2023-04-26 14:28:41 +02:00
hugetlb_cgroup.c
hugetlb_cgroup: use helper for_each_hstate and hstate_index
2022-09-11 20:25:53 -07:00
hugetlb_vmemmap.c
mm: hugetlb_vmemmap: include missing linux/moduleparam.h
2022-11-08 15:57:23 -08:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability
2022-08-08 18:06:43 -07:00
hugetlb.c
hugetlb: do not clear hugetlb dtor until allocating vmemmap
2023-08-23 17:52:41 +02:00
hwpoison-inject.c
mm/hwpoison: add __init/__exit annotations to module init/exit funcs
2022-10-03 14:03:05 -07:00
init-mm.c
mm: remove rb tree.
2022-09-26 19:46:16 -07:00
internal.h
mm/page_alloc: make boot_nodestats static
2022-10-03 14:03:30 -07:00
interval_tree.c
…
io-mapping.c
…
ioremap.c
mm: ioremap: Add ioremap/iounmap_allowed()
2022-06-27 12:22:31 +01:00
Kconfig
mm: introduce new 'lock_mm_and_find_vma()' page fault helper
2023-07-01 13:16:24 +02:00
Kconfig.debug
mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM
2023-06-14 11:15:29 +02:00
khugepaged.c
mm/khugepaged: check again on anon uffd-wp during isolation
2023-04-26 14:28:41 +02:00
kmemleak.c
mm/kmemleak: prevent soft lockup in kmemleak_scan()'s object iteration loops
2022-10-28 13:37:22 -07:00
ksm.c
mm/ksm: fix race with VMA iteration and mm_struct teardown
2023-03-30 12:49:29 +02:00
list_lru.c
mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe
2022-06-16 19:48:31 -07:00
maccess.c
mm: Fix copy_from_user_nofault().
2023-06-28 11:12:17 +02:00
madvise.c
madvise:madvise_free_pte_range(): don't use mapcount() against large folio for sharing check
2023-08-30 16:11:11 +02:00
Makefile
mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
2022-10-03 14:03:36 -07:00
mapping_dirty_helpers.c
…
memblock.c
Revert "mm: Always release pages to the buddy allocator in memblock_free_late()."
2023-02-22 12:59:50 +01:00
memcontrol.c
mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()
2023-08-11 12:08:23 +02:00
memfd.c
memfd: check for non-NULL file_seals in memfd_create() syscall
2023-06-28 11:12:27 +02:00
memory_hotplug.c
mm: add pageblock_aligned() macro
2022-10-03 14:03:04 -07:00
memory-failure.c
mm: memory-failure: fix unexpected return value in soft_offline_page()
2023-08-30 16:11:06 +02:00
memory-tiers.c
memory tier: release the new_memtier in find_create_memory_tier()
2023-03-10 09:34:27 +01:00
memory.c
mm: call arch_swap_restore() from do_swap_page()
2023-07-19 16:21:16 +02:00
mempolicy.c
mm/mempolicy: correctly update prev when policy is equal on mbind
2023-05-11 23:03:41 +09:00
mempool.c
mm/mempool: use might_alloc()
2022-06-16 19:48:30 -07:00
memremap.c
mm/memremap.c: map FS_DAX device memory as decrypted
2022-11-08 15:57:23 -08:00
memtest.c
…
migrate_device.c
mm/migrate_device: return number of migrating pages in args->cpages
2022-11-22 18:50:43 -08:00
migrate.c
mm/migrate: fix wrongly apply write bit after mkdirty on sparc64
2023-02-22 12:59:49 +01:00
mincore.c
mm: teach mincore_hugetlb about pte markers
2023-03-22 13:34:03 +01:00
mlock.c
mm/mlock: drop dead code in count_mm_mlocked_page_nr()
2022-09-26 19:46:27 -07:00
mm_init.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mm_slot.h
mm: introduce common struct mm_slot
2022-10-03 14:02:43 -07:00
mmap_lock.c
…
mmap.c
mm/mmap: Fix extra maple tree write
2023-07-19 16:22:16 +02:00
mmu_gather.c
mm/khugepaged: fix GUP-fast interaction by sending IPI
2022-11-30 14:49:42 -08:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-21 20:01:10 -07:00
mmzone.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mprotect.c
mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in
2022-10-12 15:56:46 -07:00
mremap.c
mm, mremap: fix mremap() expanding for vma's with vm_ops->close()
2023-02-09 11:28:22 +01:00
msync.c
mm/msync: use vma_find() instead of vma linked list
2022-09-26 19:46:25 -07:00
nommu.c
xtensa: fix lock_mm_and_find_vma in case VMA not found
2023-07-05 18:27:37 +01:00
oom_kill.c
mm: reduce noise in show_mem for lowmem allocations
2022-09-26 19:46:29 -07:00
page_alloc.c
mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock
2023-04-26 14:28:44 +02:00
page_counter.c
mm: page_counter: remove unneeded atomic ops for low/min
2022-09-11 20:26:01 -07:00
page_ext.c
mm/page_exit: fix kernel doc warning in page_ext_put()
2022-11-22 18:50:41 -08:00
page_idle.c
mm: don't be stuck to rmap lock on reclaim path
2022-05-19 14:08:54 -07:00
page_io.c
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
page_isolation.c
mm/page_isolation: fix clang deadcode warning
2022-10-28 13:37:22 -07:00
page_owner.c
mm: reuse pageblock_start/end_pfn() macro
2022-10-03 14:03:03 -07:00
page_poison.c
…
page_reporting.c
…
page_reporting.h
…
page_table_check.c
mm: page_table_check: Ensure user pages are not slab pages
2023-06-14 11:15:29 +02:00
page_vma_mapped.c
mm/swap: add swp_offset_pfn() to fetch PFN from swap entry
2022-09-26 19:46:05 -07:00
page-writeback.c
mm: export balance_dirty_pages_ratelimited_flags()
2022-09-26 12:28:07 +02:00
pagewalk.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
percpu-internal.h
percpu: improve percpu_alloc_percpu event trace
2022-05-13 07:20:18 -07:00
percpu-km.c
…
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
…
percpu.c
mm: percpu: use kmemleak_ignore_phys() instead of kmemleak_free()
2022-07-17 17:14:47 -07:00
pgalloc-track.h
…
pgtable-generic.c
mm: avoid unnecessary flush on change_huge_pmd()
2022-05-13 07:20:05 -07:00
process_vm_access.c
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-03 10:13:13 -07:00
readahead.c
mm: add PSI accounting around ->read_folio and ->readahead calls
2022-09-20 08:24:38 -06:00
rmap.c
mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON
2023-03-10 09:34:25 +01:00
rodata_test.c
mm/rodata_test: use PAGE_ALIGNED() helper
2022-10-03 14:03:05 -07:00
secretmem.c
mm/secretmem: remove reduntant return value
2022-10-03 14:03:36 -07:00
shmem.c
shmem: fix smaps BUG sleeping while atomic
2023-08-30 16:11:06 +02:00
shrinker_debug.c
mm: shrinkers: fix deadlock in shrinker debugfs
2023-02-22 12:59:46 +01:00
shuffle.c
mm/shuffle: convert module_param_call to module_param_cb
2022-10-03 14:03:07 -07:00
shuffle.h
…
slab_common.c
mm, slab: remove duplicate kernel-doc comment for ksize()
2022-11-07 17:11:27 +01:00
slab.c
mm/slab: Fix undefined init_cache_node_node() for NUMA and !SMP
2023-03-30 12:49:23 +02:00
slab.h
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
slob.c
Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next
2022-09-29 11:30:55 +02:00
slub.c
treewide: use prandom_u32_max() when possible, part 1
2022-10-11 17:42:55 -06:00
sparse-vmemmap.c
mm: hugetlb_vmemmap: move vmemmap code related to HugeTLB to hugetlb_vmemmap.c
2022-08-08 18:06:42 -07:00
sparse.c
mm: memory_hotplug: enumerate all supported section flags
2022-07-03 18:08:49 -07:00
swap_cgroup.c
mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
2022-10-03 14:03:36 -07:00
swap_slots.c
mm/swap: convert put_swap_page() to put_swap_folio()
2022-10-03 14:02:46 -07:00
swap_state.c
swap_state: convert free_swap_cache() to use a folio
2022-10-03 14:02:51 -07:00
swap.c
mm: add folio_add_lru_vma()
2022-10-03 14:02:45 -07:00
swap.h
mm: remove lookup_swap_cache()
2022-10-03 14:02:51 -07:00
swapfile.c
mm/swap: fix swap_info_struct race between swapoff and get_swap_pages()
2023-04-13 16:55:36 +02:00
truncate.c
mm: add split_folio()
2022-10-03 14:02:45 -07:00
usercopy.c
mm: Fix copy_from_user_nofault().
2023-06-28 11:12:17 +02:00
userfaultfd.c
mm/shmem: use page_mapping() to detect page cache for uffd continue
2022-11-08 15:57:23 -08:00
util.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
vmalloc.c
mm: add a call to flush_cache_vmap() in vmap_pfn()
2023-08-30 16:11:06 +02:00
vmpressure.c
…
vmscan.c
mm: do not reclaim private data from pinned page
2023-05-11 23:03:39 +09:00
vmstat.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
workingset.c
mm: multi-gen LRU: minimal implementation
2022-09-26 19:46:09 -07:00
z3fold.c
mm: Convert all PageMovable users to movable_operations
2022-08-02 12:34:03 -04:00
zbud.c
…
zpool.c
…
zsmalloc.c
zsmalloc: allow only one active pool compaction context
2023-08-23 17:52:40 +02:00
zswap.c
zswap: do not shrink if cgroup may not zswap
2023-06-21 16:00:54 +02:00