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Miaohe Lin 04094226d6 mm/z3fold: fix z3fold_reclaim_page races with z3fold_free 
Think about the below scenario:

CPU1				CPU2
z3fold_reclaim_page		z3fold_free
 spin_lock(&pool->lock)		 get_z3fold_header -- hold page_lock
 kref_get_unless_zero
				 kref_put--zhdr->refcount can be 1 now
 !z3fold_page_trylock
  kref_put -- zhdr->refcount is 0 now
   release_z3fold_page
    WARN_ON(!list_empty(&zhdr->buddy)); -- we're on buddy now!
    spin_lock(&pool->lock); -- deadlock here!

z3fold_reclaim_page might race with z3fold_free and will lead to pool lock
deadlock and zhdr buddy non-empty warning.  To fix this, defer getting the
refcount until page_lock is held just like what __z3fold_alloc does.  Note
this has the side effect that we won't break the reclaim if we meet a soon
to be released z3fold page now.

Link: https://lkml.kernel.org/r/20220429064051.61552-9-linmiaohe@huawei.com
Fixes: dcf5aedb24f8 ("z3fold: stricter locking and more careful reclaim")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-05-27 09:33:44 -07:00
..
damon
mm: damon: use HPAGE_PMD_SIZE
2022-05-19 14:08:55 -07:00
kasan
kasan: give better names to shadow values
2022-05-13 07:20:19 -07:00
kfence
mm: kfence: use PAGE_ALIGNED helper
2022-05-25 10:47:49 -07:00
backing-dev.c
remove congestion tracking framework
2022-03-22 15:57:01 -07:00
balloon_compaction.c
mm/balloon_compaction: make balloon page compaction callbacks static
2022-03-28 16:52:57 -04:00
bootmem_info.c
bootmem: Use page->index instead of page->freelist
2022-01-06 12:27:03 +01:00
cma_debug.c
mm/cma: change cma mutex to irq safe spinlock
2021-05-05 11:27:21 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -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
mm, compaction: fast_find_migrateblock() should return pfn in the target zone
2022-05-13 16:48:57 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE
2022-05-09 18:20:45 -07:00
debug.c
mm: unexport page_init_poison
2022-03-24 19:06:45 -07:00
dmapool.c
mm/dmapool.c: revert "make dma pool to use kmalloc_node"
2022-01-15 16:30:28 +02:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
remove inode_congested()
2022-03-22 15:57:01 -07:00
failslab.c
mm: fix missing handler for __GFP_NOWARN
2022-05-19 14:08:55 -07:00
filemap.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
folio-compat.c
mm/rmap: Convert rmap_walk() to take a folio
2022-03-21 13:01:35 -04:00
frontswap.c
frontswap: remove support for multiple ops
2022-01-22 08:33:38 +02:00
gup_test.c
selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages
2021-05-05 11:27:26 -07:00
gup_test.h
selftests/vm: gup_test: fix test flag
2021-05-05 11:27:26 -07:00
gup.c
mm/gup: fix comments to pin_user_pages_*()
2022-05-09 18:20:47 -07:00
highmem.c
highmem: fix checks in __kmap_local_sched_{in,out}
2022-04-08 14:20:36 -10:00
hmm.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
huge_memory.c
mm: khugepaged: make khugepaged_enter() void function
2022-05-19 14:08:49 -07:00
hugetlb_cgroup.c
hugetlb: add hugetlb.*.numa_stat file
2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c
mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl
2022-05-13 16:48:56 -07:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*
2022-04-28 23:16:15 -07:00
hugetlb.c
mm/hugetlb: handle uffd-wp during fork()
2022-05-13 07:20:11 -07:00
hwpoison-inject.c
mm/hwpoison: disable hwpoison filter during removing
2022-05-13 07:20:19 -07:00
init-mm.c
kernel/fork: Initialize mm's PASID
2022-02-14 19:51:47 +01:00
internal.h
mm: split free page with properly free memory accounting and without race
2022-05-27 09:33:43 -07:00
interval_tree.c
mm/interval_tree: add comments to improve code readability
2021-04-30 11:20:38 -07:00
io-mapping.c
mm: add a io_mapping_map_user helper
2021-04-30 11:20:39 -07:00
ioremap.c
mm: move ioremap_page_range to vmalloc.c
2021-09-08 11:50:24 -07:00
Kconfig
mm: Kconfig: simplify zswap configuration
2022-05-19 14:08:53 -07:00
Kconfig.debug
mm: page table check
2022-01-15 16:30:28 +02:00
khugepaged.c
mm: khugepaged: introduce khugepaged_enter_vma() helper
2022-05-19 14:08:50 -07:00
kmemleak.c
mm: kmemleak: take a full lowmem check in kmemleak_*_phys()
2022-04-15 14:49:56 -07:00
ksm.c
ksm: fix typo in comment
2022-05-25 10:47:48 -07:00
list_lru.c
mm/list_lru.c: revert "mm/list_lru: optimize memcg_reparent_list_lru_node()"
2022-04-08 14:20:36 -10:00
maccess.c
asm-generic updates for 5.18
2022-03-23 18:03:08 -07:00
madvise.c
mm: submit multipage reads for SWP_FS_OPS swap-space
2022-05-09 18:20:49 -07:00
Makefile
mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP*
2022-04-28 23:16:15 -07:00
mapping_dirty_helpers.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
memblock.c
memblock: test suite and a small cleanup
2022-03-27 13:36:06 -07:00
memcontrol.c
zswap: memcg accounting
2022-05-19 14:08:53 -07:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-05 11:08:32 -08:00
memory_hotplug.c
mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl
2022-05-13 16:48:56 -07:00
memory-failure.c
mm: don't be stuck to rmap lock on reclaim path
2022-05-19 14:08:54 -07:00
memory.c
mm/swap: avoid calling swp_swap_info when try to check SWP_STABLE_WRITES
2022-05-19 14:08:51 -07:00
mempolicy.c
mm/mempolicy: fix uninit-value in mpol_rebind_policy()
2022-05-19 14:08:54 -07:00
mempool.c
mm: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
memremap.c
mm/page-flags: reuse PG_mappedtodisk as PG_anon_exclusive for PageAnon() pages
2022-05-09 18:20:44 -07:00
memtest.c
…
migrate_device.c
mm: remember exclusively mapped anonymous pages with PG_anon_exclusive
2022-05-09 18:20:44 -07:00
migrate.c
mm/migrate: convert move_to_new_page() into move_to_new_folio()
2022-05-13 07:20:17 -07:00
mincore.c
mm: teach core mm about pte markers
2022-05-13 07:20:09 -07:00
mlock.c
mm/munlock: protect the per-CPU pagevec by a local_lock_t
2022-04-01 11:46:09 -07:00
mm_init.c
include/linux/page-flags-layout.h: cleanups
2021-04-30 11:20:42 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
mm: mmap: register suitable readonly file vmas for khugepaged
2022-05-19 14:08:50 -07:00
mmu_gather.c
mm/mmu_gather: limit free batch count and add schedule point in tlb_batch_pages_flush
2022-04-28 23:16:12 -07:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-21 20:01:10 -07:00
mmzone.c
Folio changes for 5.18
2022-03-22 17:03:12 -07:00
mprotect.c
mm/hugetlb: handle UFFDIO_WRITEPROTECT
2022-05-13 07:20:11 -07:00
mremap.c
mm: hugetlb: considering PMD sharing when flushing cache/TLBs
2022-05-13 07:20:07 -07:00
msync.c
mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
2021-04-30 11:20:37 -07:00
nommu.c
no-MMU: expose vmalloc_huge() for alloc_large_system_hash()
2022-04-25 10:11:49 -07:00
oom_kill.c
oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup
2022-04-21 20:01:10 -07:00
page_alloc.c
mm: split free page with properly free memory accounting and without race
2022-05-27 09:33:43 -07:00
page_counter.c
mm/page_counter: remove an incorrect call to propagate_protected_usage()
2022-01-15 16:30:27 +02:00
page_ext.c
mm: use for_each_online_node and node_online instead of open coding
2022-04-29 14:36:58 -07:00
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
MM: handle THP in swap_*page_fs() - count_vm_events()
2022-05-09 18:20:49 -07:00
page_isolation.c
mm: split free page with properly free memory accounting and without race
2022-05-27 09:33:43 -07:00
page_owner.c
mm/page_owner.c: add missing __initdata attribute
2022-05-19 14:08:54 -07:00
page_poison.c
mm: page_poison: print page info when corruption is caught
2021-04-30 11:20:36 -07:00
page_reporting.c
mm/page_reporting: allow driver to specify reporting order
2021-06-29 10:53:47 -07:00
page_reporting.h
mm/page_reporting: export reporting order as module parameter
2021-06-29 10:53:47 -07:00
page_table_check.c
mm: page_table_check: move pxx_user_accessible_page into x86
2022-05-13 07:20:17 -07:00
page_vma_mapped.c
mm: pvmw: add support for walking devmap pages
2022-04-28 23:16:10 -07:00
page-writeback.c
mm: rework calculation of bdi_min_ratio in bdi_set_min_ratio
2022-04-28 23:15:57 -07:00
pagewalk.c
mm: pagewalk: fix walk for hugepage tables
2021-06-29 10:53:49 -07:00
percpu-internal.h
percpu: improve percpu_alloc_percpu event trace
2022-05-13 07:20:18 -07:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
percpu: improve percpu_alloc_percpu event trace
2022-05-13 07:20:18 -07:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm: avoid unnecessary flush on change_huge_pmd()
2022-05-13 07:20:05 -07:00
process_vm_access.c
mm/process_vm_access.c: remove duplicate include
2021-05-05 11:27:27 -07:00
ptdump.c
mm: sparsemem: use page table lock to protect kernel pmd operations
2022-03-22 15:57:08 -07:00
readahead.c
readahead: Update comments
2022-04-01 14:40:42 -04:00
rmap.c
mm: don't be stuck to rmap lock on reclaim path
2022-05-19 14:08:54 -07:00
rodata_test.c
…
secretmem.c
mm/secretmem: fix panic when growing a memfd_secret
2022-04-15 14:49:54 -07:00
shmem.c
mm/shmem: fix shmem folio swapoff hang
2022-05-25 10:47:47 -07:00
shuffle.c
mm: eliminate "expecting prototype" kernel-doc warnings
2021-04-16 16:10:36 -07:00
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slab.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slab.h
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-15 14:49:55 -07:00
slob.c
mm: make minimum slab alignment a runtime property
2022-05-13 07:20:07 -07:00
slub.c
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-15 14:49:55 -07:00
sparse-vmemmap.c
mm/sparse-vmemmap: improve memory savings for compound devmaps
2022-04-28 23:16:16 -07:00
sparse.c
mm/memory-failure.c: move clear_hwpoisoned_pages
2022-05-13 07:20:19 -07:00
swap_cgroup.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
swap_slots.c
mm/swap: remove buggy cache->nr check in refill_swap_slots_cache
2022-05-19 14:08:51 -07:00
swap_state.c
mm/swap: use helper macro __ATTR_RW
2022-05-19 14:08:50 -07:00
swap.c
mm/swap: fix the comment of get_kernel_pages
2022-05-19 14:08:52 -07:00
swap.h
swap: convert add_to_swap() to take a folio
2022-05-13 07:20:15 -07:00
swapfile.c
mm/swap: fix comment about swap extent
2022-05-19 14:08:52 -07:00
truncate.c
Filesystem folio changes for 5.18
2022-03-22 18:26:56 -07:00
usercopy.c
Merge branch 'akpm' (patches from Andrew)
2022-03-22 16:11:53 -07:00
userfaultfd.c
mm/uffd: enable write protection for shmem & hugetlbfs
2022-05-13 07:20:11 -07:00
util.c
mm: create new mm/swap.h header file
2022-05-09 18:20:47 -07:00
vmacache.c
…
vmalloc.c
mm/vmalloc: use raw_cpu_ptr() for vmap_block_queue access
2022-05-13 07:20:18 -07:00
vmpressure.c
mm/vmpressure: fix data-race with memcg->socket_pressure
2021-11-06 13:30:40 -07:00
vmscan.c
Revert "mm/vmscan: never demote for memcg reclaim"
2022-05-25 10:47:48 -07:00
vmstat.c
mm: zswap: add basic meminfo and vmstat coverage
2022-05-19 14:08:53 -07:00
workingset.c
memcg: sync flush only if periodic flush is delayed
2022-04-21 20:01:09 -07:00
z3fold.c
mm/z3fold: fix z3fold_reclaim_page races with z3fold_free
2022-05-27 09:33:44 -07:00
zbud.c
mm/zbud: add kerneldoc fields for zbud_pool
2021-07-01 11:06:03 -07:00
zpool.c
zpool: remove the list of pools_head
2022-01-15 16:30:31 +02:00
zsmalloc.c
zsmalloc: replace get_cpu_var with local_lock
2022-01-22 08:33:37 +02:00
zswap.c
zswap: memcg accounting
2022-05-19 14:08:53 -07:00