Hugh Dickins f2b277c4d1 memfd: fix F_SEAL_WRITE after shmem huge page allocated ... Wangyong reports: after enabling tmpfs filesystem to support transparent hugepage with the following command: echo always > /sys/kernel/mm/transparent_hugepage/shmem_enabled the docker program tries to add F_SEAL_WRITE through the following command, but it fails unexpectedly with errno EBUSY: fcntl(5, F_ADD_SEALS, F_SEAL_WRITE) = -1. That is because memfd_tag_pins() and memfd_wait_for_pins() were never updated for shmem huge pages: checking page_mapcount() against page_count() is hopeless on THP subpages - they need to check total_mapcount() against page_count() on THP heads only. Make memfd_tag_pins() (compared > 1) as strict as memfd_wait_for_pins() (compared != 1): either can be justified, but given the non-atomic total_mapcount() calculation, it is better now to be strict. Bear in mind that total_mapcount() itself scans all of the THP subpages, when choosing to take an XA_CHECK_SCHED latency break. Also fix the unlikely xa_is_value() case in memfd_wait_for_pins(): if a page has been swapped out since memfd_tag_pins(), then its refcount must have fallen, and so it can safely be untagged. Link: https://lkml.kernel.org/r/a4f79248-df75-2c8c-3df-ba3317ccb5da@google.com Signed-off-by: Hugh Dickins <hughd@google.com> Reported-by: Zeal Robot <zealci@zte.com.cn> Reported-by: wangyong <wang.yong12@zte.com.cn> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: CGEL ZTE <cgel.zte@gmail.com> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: Song Liu <songliubraving@fb.com> Cc: Yang Yang <yang.yang29@zte.com.cn> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2022-03-05 11:08:32 -08:00
..
damon	mm/damon: hide kernel pointer from tracepoint event	2022-01-15 16:30:33 +02:00
kasan	lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()	2022-01-22 08:33:38 +02:00
kfence	kfence: make test case compatible with run time set sample interval	2022-02-11 17:55:00 -08:00
backing-dev.c	mm: bdi: initialize bdi_min_ratio when bdi is unregistered	2021-12-10 17:10:56 -08:00
balloon_compaction.c
bootmem_info.c	bootmem: Use page->index instead of page->freelist	2022-01-06 12:27:03 +01:00
cma.c	memblock: rename memblock_free to memblock_phys_free	2021-11-06 13:30:41 -07:00
cma.h
cma_debug.c
cma_sysfs.c
compaction.c	mm: compaction: fix the migration stats in trace_mm_compaction_migratepages()	2022-01-15 16:30:30 +02:00
debug.c	mm,fs: split dump_mapping() out from dump_page()	2022-01-15 16:30:26 +02:00
debug_page_ref.c
debug_vm_pgtable.c	mm/debug_vm_pgtable: remove pte entry from the page table	2022-02-04 09:25:04 -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.c: remove redundant early_ioremap_shutdown()	2021-09-08 11:50:24 -07:00
fadvise.c
failslab.c
filemap.c	Merge branch 'akpm' (patches from Andrew)	2022-01-22 11:28:23 +02:00
folio-compat.c	filemap: Add filemap_release_folio()	2022-01-04 13:15:34 -05:00
frontswap.c	frontswap: remove support for multiple ops	2022-01-22 08:33:38 +02:00
gup.c	Revert "mm/gup: small refactoring: simplify try_grab_page()"	2022-02-03 06:51:42 -08:00
gup_test.c
gup_test.h
highmem.c	Fixes for 5.16 folios:	2021-11-25 10:13:56 -08:00
hmm.c	mm/hmm.c: allow VM_MIXEDMAP to work with hmm_range_fault	2022-01-15 16:30:31 +02:00
huge_memory.c	Merge branch 'akpm' (patches from Andrew)	2022-01-15 20:37:06 +02:00
hugetlb.c	hugetlbfs: fix a truncation issue in hugepages parameter	2022-02-26 09:51:17 -08:00
hugetlb_cgroup.c	hugetlb: add hugetlb.*.numa_stat file	2022-01-15 16:30:29 +02:00
hugetlb_vmemmap.c	mm: hugetlb: introduce CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON	2021-06-30 20:47:26 -07:00
hugetlb_vmemmap.h	mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate	2021-06-30 20:47:25 -07:00
hwpoison-inject.c	mm: hwpoison: don't drop slab caches for offlining non-LRU page	2021-09-03 09:58:15 -07:00
init-mm.c	mm: add setup_initial_init_mm() helper	2021-07-08 11:48:21 -07:00
internal.h	Merge branch 'akpm' (patches from Andrew)	2022-01-15 20:37:06 +02:00
interval_tree.c
io-mapping.c
ioremap.c	mm: move ioremap_page_range to vmalloc.c	2021-09-08 11:50:24 -07:00
Kconfig	mm: hide the FRONTSWAP Kconfig symbol	2022-01-22 08:33:38 +02:00
Kconfig.debug	mm: page table check	2022-01-15 16:30:28 +02:00
khugepaged.c	mm/page_table_check: check entries at pmd levels	2022-02-04 09:25:04 -08:00
kmemleak.c	mm/kmemleak: avoid scanning potential huge holes	2022-02-04 09:25:05 -08:00
ksm.c	mm: ksm: fix use-after-free kasan report in ksm_might_need_to_copy	2022-01-15 16:30:31 +02:00
list_lru.c	mm: list_lru: only add memcg-aware lrus to the global lru list	2021-11-06 13:30:35 -07:00
maccess.c	ARM: 9115/1: mm/maccess: fix unaligned copy_{from,to}_kernel_nofault	2021-08-20 11:39:25 +01:00
madvise.c	mm: fix use-after-free when anon vma name is used after vma is freed	2022-03-05 11:08:32 -08:00
Makefile	mm: remove cleancache	2022-01-22 08:33:38 +02:00
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: use kfree() to release kmalloced memblock regions	2022-02-20 08:45:39 +02:00
memcontrol.c	mm: memcg: synchronize objcg lists with a dedicated spinlock	2022-02-11 17:55:00 -08:00
memfd.c	memfd: fix F_SEAL_WRITE after shmem huge page allocated	2022-03-05 11:08:32 -08:00
memory-failure.c	memory-failure: fetch compound_head after pgmap_pfn_valid()	2022-01-30 09:56:58 +02:00
memory.c	Merge branch 'akpm' (patches from Andrew)	2022-01-20 10:41:01 +02:00
memory_hotplug.c	treewide: Add missing includes masked by cgroup -> bpf dependency	2021-12-03 10:58:13 -08:00
mempolicy.c	mm: refactor vm_area_struct::anon_vma_name usage code	2022-03-05 11:08:32 -08:00
mempool.c	mm: remove spurious blkdev.h includes	2021-10-18 06:17:01 -06:00
memremap.c	Merge branch 'akpm' (patches from Andrew)	2022-01-15 20:37:06 +02:00
memtest.c
migrate.c	mm/migrate.c: rework migration_entry_wait() to not take a pageref	2022-01-22 08:33:34 +02:00
mincore.c
mlock.c	mm: refactor vm_area_struct::anon_vma_name usage code	2022-03-05 11:08:32 -08:00
mm_init.c
mmap.c	mm: refactor vm_area_struct::anon_vma_name usage code	2022-03-05 11:08:32 -08:00
mmap_lock.c	mm: mmap_lock: fix disabling preemption directly	2021-07-23 17:43:28 -07:00
mmu_gather.c	mm: move tlb_flush_pending inline helpers to mm_inline.h	2022-01-15 16:30:27 +02:00
mmu_notifier.c
mmzone.c
mprotect.c	mm: refactor vm_area_struct::anon_vma_name usage code	2022-03-05 11:08:32 -08:00
mremap.c	mm, hugepages: add mremap() support for hugepage backed vma	2021-11-06 13:30:39 -07:00
msync.c
nommu.c	Merge branch 'akpm' (patches from Andrew)	2021-11-06 14:08:17 -07:00
oom_kill.c	Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2022-01-17 05:49:30 +02:00
page-writeback.c	mm/writeback: Improve __folio_mark_dirty() comment	2022-01-02 20:28:57 -05:00
page_alloc.c	Merge branch 'akpm' (patches from Andrew)	2022-01-20 10:41:01 +02:00
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: make some vars and functions static or __init	2022-01-15 16:30:31 +02:00
page_idle.c	mm/idle_page_tracking: make PG_idle reusable	2021-09-08 11:50:24 -07:00
page_io.c	delayacct: support swapin delay accounting for swapping without blkio	2022-01-20 08:52:55 +02:00
page_isolation.c	Revert "mm/page_isolation: unset migratetype directly for non Buddy page"	2022-02-04 09:25:04 -08:00
page_owner.c	lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()	2022-01-22 08:33:37 +02:00
page_poison.c
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: check entries at pmd levels	2022-02-04 09:25:04 -08:00
page_vma_mapped.c	mm: device exclusive memory access	2021-07-01 11:06:03 -07:00
pagewalk.c	mm: pagewalk: fix walk for hugepage tables	2021-06-29 10:53:49 -07:00
percpu-internal.h	mm: memcg/percpu: account extra objcg space to memory cgroups	2022-01-15 16:30:31 +02:00
percpu-km.c	percpu: flush tlb in pcpu_reclaim_populated()	2021-07-04 18:30:17 +00:00
percpu-stats.c	percpu: rework memcg accounting	2021-06-05 20:43:15 +00:00
percpu-vm.c	percpu: flush tlb in pcpu_reclaim_populated()	2021-07-04 18:30:17 +00:00
percpu.c	bitmap patches for 5.17-rc1	2022-01-23 06:20:44 +02:00
pgalloc-track.h
pgtable-generic.c	mm: move tlb_flush_pending inline helpers to mm_inline.h	2022-01-15 16:30:27 +02:00
process_vm_access.c
ptdump.c
readahead.c	readahead: Convert page_cache_ra_unbounded to folios	2022-01-04 13:15:34 -05:00
rmap.c	mm/rmap: fix potential batched TLB flush race	2022-01-15 16:30:31 +02:00
rodata_test.c
secretmem.c	mm/secretmem: avoid letting secretmem_users drop to zero	2021-10-28 17:18:55 -07:00
shmem.c	mm: simplify try_to_unuse	2022-01-22 08:33:38 +02:00
shuffle.c
shuffle.h
slab.c	mm/kasan: Convert to struct folio and struct slab	2022-01-06 12:26:14 +01:00
slab.h	slab changes for 5.17 - part 2	2022-01-18 06:40:47 +02:00
slab_common.c	Merge branch 'akpm' (patches from Andrew)	2022-01-15 20:37:06 +02:00
slob.c	mm/slob: Remove unnecessary page_mapcount_reset() function call	2022-01-06 12:27:28 +01:00
slub.c	mm/slub: Define struct slab fields for CONFIG_SLUB_CPU_PARTIAL only when enabled	2022-01-06 12:26:53 +01:00
sparse-vmemmap.c	mm: remove redundant smp_wmb()	2021-11-06 13:30:36 -07:00
sparse.c	bootmem: Use page->index instead of page->freelist	2022-01-06 12:27:03 +01:00
swap.c	Merge branch 'akpm' (patches from Andrew)	2022-01-15 20:37:06 +02:00
swap_cgroup.c
swap_slots.c	treewide: Add missing includes masked by cgroup -> bpf dependency	2021-12-03 10:58:13 -08:00
swap_state.c	mm/workingset: Convert workingset_refault() to take a folio	2021-10-18 07:49:40 -04:00
swapfile.c	mm: mark swap_lock and swap_active_head static	2022-01-22 08:33:38 +02:00
truncate.c	mm: remove cleancache	2022-01-22 08:33:38 +02:00
usercopy.c	mm: Convert check_heap_object() to use struct slab	2022-01-06 12:25:51 +01:00
userfaultfd.c	mm: shmem: don't truncate page if memory failure happens	2022-01-15 16:30:26 +02:00
util.c	mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls	2022-03-04 10:00:37 -08:00
vmacache.c
vmalloc.c	mm/vmalloc: be more explicit about supported gfp flags.	2022-01-15 16:30:28 +02:00
vmpressure.c	mm/vmpressure: fix data-race with memcg->socket_pressure	2021-11-06 13:30:40 -07:00
vmscan.c	mm: vmscan: remove deadlock due to throttling failing to make progress	2022-02-11 17:55:00 -08:00
vmstat.c	mm/vmstat: add events for THP max_ptes_* exceeds	2022-01-15 16:30:29 +02:00
workingset.c	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
z3fold.c	mm/z3fold: add kerneldoc fields for z3fold_pool	2021-07-01 11:06:03 -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	frontswap: remove support for multiple ops	2022-01-22 08:33:38 +02:00