iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/mm
History
Zach O'Keefe ae63c898f4 mm/MADV_COLLAPSE: set EAGAIN on unexpected page refcount 
During collapse, in a few places we check to see if a given small page has
any unaccounted references.  If the refcount on the page doesn't match our
expectations, it must be there is an unknown user concurrently interested
in the page, and so it's not safe to move the contents elsewhere. 
However, the unaccounted pins are likely an ephemeral state.

In this situation, MADV_COLLAPSE returns -EINVAL when it should return
-EAGAIN.  This could cause userspace to conclude that the syscall
failed, when it in fact could succeed by retrying.

Link: https://lkml.kernel.org/r/20230125015738.912924-1-zokeefe@google.com
Fixes: 7d8faaf15545 ("mm/madvise: introduce MADV_COLLAPSE sync hugepage collapse")
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
Reported-by: Hugh Dickins <hughd@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-02-16 18:11:59 -08:00
..
damon
mm/damon: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
kasan
kasan: fix Oops due to missing calls to kasan_arch_is_ready()
2023-02-09 15:56:50 -08:00
kfence
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
kmsan
kmsan: export kmsan_handle_urb
2022-12-21 14:31:52 -08:00
backing-dev.c
mm: add /sys/class/bdi/<bdi>/min_ratio_fine knob
2022-11-30 15:59:06 -08:00
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
mm, compaction: fix fast_isolate_around() to stay within boundaries
2022-11-30 15:59:07 -08:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm: remove unused savedwrite infrastructure
2022-11-30 15:58:49 -08:00
debug.c
mm,thp,rmap: simplify compound page mapcount handling
2022-11-30 15:58:46 -08:00
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
mm/fadvise: use LLONG_MAX instead of -1 for eof
2022-12-11 18:12:11 -08:00
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
2023-02-16 18:11:58 -08:00
folio-compat.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
frontswap.c
frontswap: don't call ->init if no ops are registered
2022-09-26 12:14:34 -07:00
gup_test.c
mm/gup_test: free memory allocated via kvcalloc() using kvfree()
2022-12-15 16:37:48 -08:00
gup_test.h
mm/gup_test: start/stop/read functionality for PIN LONGTERM test
2022-11-08 17:37:15 -08:00
gup.c
mm/gup: add folio to list when folio_isolate_lru() succeed
2023-02-03 17:52:24 -08:00
highmem.c
highmem: fix kmap_to_page() for kmap_local_page() addresses
2022-10-12 18:51:51 -07:00
hmm.c
mm: Remove pointless barrier() after pmdp_get_lockless()
2022-12-15 10:37:27 -08:00
huge_memory.c
ARM64:
2022-12-15 11:12:21 -08:00
hugetlb_cgroup.c
mm/hugeltb_cgroup: convert hugetlb_cgroup_commit_charge*() to folios
2022-11-30 15:58:43 -08:00
hugetlb_vmemmap.c
mm/hugetlb_vmemmap: remap head page to newly allocated page
2022-11-30 15:58:47 -08:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability
2022-08-08 18:06:43 -07:00
hugetlb.c
mm: fix a few rare cases of using swapin error pte marker
2023-01-18 17:02:19 -08:00
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/hwpoison: introduce per-memory_block hwpoison counter
2022-11-08 17:37:22 -08:00
interval_tree.c
…
io-mapping.c
…
ioremap.c
mm: ioremap: Add ioremap/iounmap_allowed()
2022-06-27 12:22:31 +01:00
Kconfig
New Feature:
2022-12-17 14:06:53 -06:00
Kconfig.debug
mm, slub: add CONFIG_SLUB_TINY
2022-11-27 23:38:02 +01:00
khugepaged.c
mm/MADV_COLLAPSE: set EAGAIN on unexpected page refcount
2023-02-16 18:11:59 -08:00
kmemleak.c
mm: use stack_depot_early_init for kmemleak
2023-01-31 16:44:10 -08:00
ksm.c
mm: hwpoison: support recovery from ksm_might_need_to_copy()
2023-02-09 15:56:51 -08:00
list_lru.c
mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe
2022-06-16 19:48:31 -07:00
maccess.c
maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()
2022-11-11 11:44:46 -08:00
madvise.c
mm: update mmap_sem comments to refer to mmap_lock
2023-01-11 16:14:22 -08:00
Makefile
mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
2022-10-03 14:03:36 -07:00
mapping_dirty_helpers.c
mm: Rename pmd_read_atomic()
2022-12-15 10:37:27 -08:00
memblock.c
mm: Always release pages to the buddy allocator in memblock_free_late().
2023-01-08 18:49:33 +02:00
memcontrol.c
Revert "mm: add nodes= arg to memory.reclaim"
2023-01-31 16:44:07 -08:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-05 11:08:32 -08:00
memory_hotplug.c
mm: add pageblock_aligned() macro
2022-10-03 14:03:04 -07:00
memory-failure.c
mm/memory-failure.c: cleanup in unpoison_memory
2022-11-30 15:59:08 -08:00
memory-tiers.c
mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init
2022-11-30 15:58:54 -08:00
memory.c
mm: hwpoison: support recovery from ksm_might_need_to_copy()
2023-02-09 15:56:51 -08:00
mempolicy.c
migrate: hugetlb: check for hugetlb shared PMD in node migration
2023-01-31 16:44:09 -08:00
mempool.c
mempool: do not use ksize() for poisoning
2022-11-30 15:58:41 -08:00
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 patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
mincore.c
mm: convert find_get_incore_page() to filemap_get_incore_folio()
2022-11-08 17:37:18 -08:00
mlock.c
mm/mlock: drop dead code in count_mm_mlocked_page_nr()
2022-09-26 19:46:27 -07:00
mm_init.c
memory: move hotplug memory notifier priority to same file for easy sorting
2022-11-08 17:37:17 -08:00
mm_slot.h
mm: introduce common struct mm_slot
2022-10-03 14:02:43 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
mm: update mmap_sem comments to refer to mmap_lock
2023-01-11 16:14:22 -08:00
mmu_gather.c
mm: mmu_gather: allow more than one batch of delayed rmaps
2022-12-11 18:12:21 -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: fix a few rare cases of using swapin error pte marker
2023-01-18 17:02:19 -08:00
mremap.c
mm, mremap: fix mremap() expanding for vma's with vm_ops->close()
2023-01-31 16:44:08 -08:00
msync.c
mm/msync: use vma_find() instead of vma linked list
2022-09-26 19:46:25 -07:00
nommu.c
nommu: fix split_vma() map_count error
2023-01-11 16:14:23 -08:00
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: update comments in __free_pages_ok()
2022-12-11 18:12:17 -08:00
page_counter.c
mm: page_counter: remove unneeded atomic ops for low/min
2022-09-11 20:26:01 -07:00
page_ext.c
Merge branch 'mm-hotfixes-stable' into mm-stable
2022-11-30 14:58:42 -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
2022-11-25 13:01:55 -05:00
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
mm/page_reporting: Add checks for page_reporting_order param
2022-11-28 16:48:19 +00:00
page_reporting.h
…
page_table_check.c
mm: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
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: add bdi_set_min_ratio_no_scale() function
2022-11-30 15:59:06 -08:00
pagewalk.c
mm/pagewalk: add walk_page_range_vma()
2022-12-11 18:12:08 -08:00
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
mm/percpu.c: remove the lcm code since block size is fixed at page size
2022-11-07 22:59:18 -08:00
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
2022-11-25 13:01:55 -05:00
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,thp,rmap: fix races between updates of subpages_mapcount
2022-12-11 18:12:20 -08:00
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
mm/shmem: restore SHMEM_HUGE_DENY precedence over MADV_COLLAPSE
2023-01-11 16:14:20 -08:00
shrinker_debug.c
mm: shrinkers: fix deadlock in shrinker debugfs
2023-02-09 15:56:51 -08:00
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
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
slab.c
Merge branch 'slab/for-6.2/kmalloc_redzone' into slab/for-next
2022-11-21 10:36:09 +01:00
slab.h
Merge branch 'slub-tiny-v1r6' into slab/for-next
2022-12-01 00:14:00 +01:00
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
MM patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
sparse-vmemmap.c
mm/sparse-vmemmap: generalise vmemmap_populate_hugepages()
2022-12-11 18:12:12 -08:00
sparse.c
mm/hwpoison: introduce per-memory_block hwpoison counter
2022-11-08 17:37:22 -08:00
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
mm: mmu_gather: prepare to gather encoded page pointers with flags
2022-11-30 15:58:50 -08:00
swap.c
mm: teach release_pages() to take an array of encoded page pointers too
2022-11-30 15:58:50 -08:00
swap.h
mm: convert find_get_incore_page() to filemap_get_incore_folio()
2022-11-08 17:37:18 -08:00
swapfile.c
mm: hwpoison: support recovery from ksm_might_need_to_copy()
2023-02-09 15:56:51 -08:00
truncate.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
usercopy.c
mm: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
userfaultfd.c
New Feature:
2022-12-17 14:06:53 -06:00
util.c
mm,thp,rmap: simplify compound page mapcount handling
2022-11-30 15:58:46 -08:00
vmalloc.c
mm: vmalloc: use trace_free_vmap_area_noflush event
2022-11-08 17:37:17 -08:00
vmpressure.c
mm/vmpressure: fix data-race with memcg->socket_pressure
2021-11-06 13:30:40 -07:00
vmscan.c
mm: shrinkers: fix deadlock in shrinker debugfs
2023-02-09 15:56:51 -08:00
vmstat.c
mm: vmscan: split khugepaged stats from direct reclaim stats
2022-11-30 15:58:41 -08:00
workingset.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
z3fold.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zbud.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zpool.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zsmalloc.c
zsmalloc: fix a race with deferred_handles storing
2023-01-31 16:44:07 -08:00
zswap.c
zswap: fix writeback lock ordering for zsmalloc
2022-12-11 18:12:09 -08:00