Linus Torvalds a8b169afbf Avoid page waitqueue race leaving possible page locker waiting ... The "lock_page_killable()" function waits for exclusive access to the page lock bit using the WQ_FLAG_EXCLUSIVE bit in the waitqueue entry set. That means that if it gets woken up, other waiters may have been skipped. That, in turn, means that if it sees the page being unlocked, it *must* take that lock and return success, even if a lethal signal is also pending. So instead of checking for lethal signals first, we need to check for them after we've checked the actual bit that we were waiting for. Even if that might then delay the killing of the process. This matches the order of the old "wait_on_bit_lock()" infrastructure that the page locking used to use (and is still used in a few other areas). Note that if we still return an error after having unsuccessfully tried to acquire the page lock, that is ok: that means that some other thread was able to get ahead of us and lock the page, and when that other thread then unlocks the page, the wakeup event will be repeated. So any other pending waiters will now get properly woken up. Fixes: 6290602709 ("mm: add PageWaiters indicating tasks are waiting for a page bit") Cc: Nick Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Jan Kara <jack@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Andi Kleen <ak@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-08-27 16:25:09 -07:00
..
kasan	kasan: avoid -Wmaybe-uninitialized warning	2017-08-02 16:34:46 -07:00
Kconfig	mm/kasan: add support for memory hotplug	2017-07-10 16:32:33 -07:00
Kconfig.debug	…
Makefile	…
backing-dev.c	…
balloon_compaction.c	mm/balloon_compaction.c: don't zero ballooned pages	2017-08-10 15:54:07 -07:00
bootmem.c	…
cleancache.c	…
cma.c	cma: fix calculation of aligned offset	2017-07-10 16:32:32 -07:00
cma.h	…
cma_debug.c	mm/cma_debug.c: fix stack corruption due to sprintf usage	2017-08-18 15:32:02 -07:00
compaction.c	mm, compaction: skip over holes in __reset_isolation_suitable	2017-07-06 16:24:32 -07:00
debug.c	mm: make tlb_flush_pending global	2017-08-10 15:54:07 -07:00
debug_page_ref.c	…
dmapool.c	…
early_ioremap.c	…
fadvise.c	…
failslab.c	…
filemap.c	Avoid page waitqueue race leaving possible page locker waiting	2017-08-27 16:25:09 -07:00
frame_vector.c	…
frontswap.c	…
gup.c	mm, gup: ensure real head page is ref-counted when using hugepages	2017-07-06 16:24:34 -07:00
highmem.c	…
huge_memory.c	mm, oom: fix potential data corruption when oom_reaper races with writer	2017-08-18 15:32:01 -07:00
hugetlb.c	userfaultfd: hugetlbfs: remove superfluous page unlock in VM_SHARED case	2017-08-10 15:54:06 -07:00
hugetlb_cgroup.c	…
hwpoison-inject.c	…
init-mm.c	…
internal.h	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-02 16:34:46 -07:00
interval_tree.c	…
khugepaged.c	mm: make PR_SET_THP_DISABLE immediately active	2017-07-10 16:32:31 -07:00
kmemcheck.c	…
kmemleak-test.c	…
kmemleak.c	mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects	2017-07-06 16:24:34 -07:00
ksm.c	mm: fix KSM data corruption	2017-08-10 15:54:07 -07:00
list_lru.c	mm/list_lru.c: fix list_lru_count_node() to be race free	2017-07-10 16:32:33 -07:00
maccess.c	…
madvise.c	mm/madvise.c: fix freeing of locked page with MADV_FREE	2017-08-25 16:12:46 -07:00
memblock.c	mm/memblock.c: reversed logic in memblock_discard()	2017-08-25 16:12:46 -07:00
memcontrol.c	mm: memcontrol: fix NULL pointer crash in test_clear_page_writeback()	2017-08-18 15:32:01 -07:00
memory-failure.c	mm, hugetlb, soft_offline: use new_page_nodemask for soft offline migration	2017-07-10 16:32:32 -07:00
memory.c	mm, oom: fix potential data corruption when oom_reaper races with writer	2017-08-18 15:32:01 -07:00
memory_hotplug.c	mm/memory-hotplug: switch locking to a percpu rwsem	2017-07-10 16:32:33 -07:00
mempolicy.c	mm/mempolicy: fix use after free when calling get_mempolicy	2017-08-18 15:32:02 -07:00
mempool.c	…
memtest.c	…
migrate.c	Sanitize 'move_pages()' permission checks	2017-08-20 13:26:27 -07:00
mincore.c	…
mlock.c	…
mm_init.c	…
mmap.c	mm: fix overflow check in expand_upwards()	2017-07-14 15:05:12 -07:00
mmu_context.c	…
mmu_notifier.c	…
mmzone.c	…
mprotect.c	mm: migrate: prevent racy access to tlb_flush_pending	2017-08-10 15:54:07 -07:00
mremap.c	userfaultfd: non-cooperative: notify about unmap of destination during mremap	2017-08-02 16:34:46 -07:00
msync.c	…
nobootmem.c	mm: discard memblock data later	2017-08-18 15:32:01 -07:00
nommu.c	…
oom_kill.c	mm/oom_kill.c: add tracepoints for oom reaper-related events	2017-07-10 16:32:32 -07:00
page-writeback.c	mm: memcontrol: fix NULL pointer crash in test_clear_page_writeback()	2017-08-18 15:32:01 -07:00
page_alloc.c	PM/hibernate: touch NMI watchdog when creating snapshot	2017-08-25 16:12:46 -07:00
page_counter.c	…
page_ext.c	…
page_idle.c	…
page_io.c	mm/page_io.c: fix oops during block io poll in swapin path	2017-08-02 17:16:11 -07:00
page_isolation.c	mm: unify new_node_page and alloc_migrate_target	2017-07-10 16:32:31 -07:00
page_owner.c	mm: avoid taking zone lock in pagetypeinfo_showmixed()	2017-07-10 16:32:32 -07:00
page_poison.c	…
page_vma_mapped.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
pagewalk.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
percpu-internal.h	…
percpu-km.c	…
percpu-stats.c	…
percpu-vm.c	…
percpu.c	…
pgtable-generic.c	…
process_vm_access.c	…
quicklist.c	…
readahead.c	…
rmap.c	rmap: do not call mmu_notifier_invalidate_page() under ptl	2017-08-10 15:54:07 -07:00
rodata_test.c	…
shmem.c	mm, shmem: fix handling /sys/kernel/mm/transparent_hugepage/shmem_enabled	2017-08-25 16:12:46 -07:00
slab.c	mm: memcontrol: account slab stats per lruvec	2017-07-06 16:24:35 -07:00
slab.h	mm: memcontrol: account slab stats per lruvec	2017-07-06 16:24:35 -07:00
slab_common.c	mm: allow slab_nomerge to be set at build time	2017-07-06 16:24:31 -07:00
slob.c	…
slub.c	slub: fix per memcg cache leak on css offline	2017-08-18 15:32:01 -07:00
sparse-vmemmap.c	mm, tree wide: replace __GFP_REPEAT by __GFP_RETRY_MAYFAIL with more useful semantic	2017-07-12 16:26:03 -07:00
sparse.c	mm, memory_hotplug: do not associate hotadded memory to zones until online	2017-07-06 16:24:32 -07:00
swap.c	mm: swap: provide lru_add_drain_all_cpuslocked()	2017-07-10 16:32:33 -07:00
swap_cgroup.c	mm, THP, swap: delay splitting THP during swap out	2017-07-06 16:24:31 -07:00
swap_slots.c	mm/swap_slots.c: don't disable preemption while taking the per-CPU cache	2017-07-10 16:32:32 -07:00
swap_state.c	swap: add block io poll in swapin path	2017-07-10 16:32:30 -07:00
swapfile.c	swap: add block io poll in swapin path	2017-07-10 16:32:30 -07:00
truncate.c	mm/truncate.c: fix THP handling in invalidate_mapping_pages()	2017-07-10 16:32:32 -07:00
usercopy.c	…
userfaultfd.c	…
util.c	mm: fix global NR_SLAB_.*CLAIMABLE counter reads	2017-08-10 15:54:06 -07:00
vmacache.c	…
vmalloc.c	mm/vmalloc.c: don't unconditonally use __GFP_HIGHMEM	2017-08-18 15:32:02 -07:00
vmpressure.c	mm, vmpressure: pass-through notification support	2017-07-10 16:32:31 -07:00
vmscan.c	mm, tree wide: replace __GFP_REPEAT by __GFP_RETRY_MAYFAIL with more useful semantic	2017-07-12 16:26:03 -07:00
vmstat.c	mm: avoid taking zone lock in pagetypeinfo_showmixed()	2017-07-10 16:32:32 -07:00
workingset.c	mm: memcontrol: per-lruvec stats infrastructure	2017-07-06 16:24:35 -07:00
z3fold.c	…
zbud.c	…
zpool.c	…
zsmalloc.c	zram: do not free pool->size_class	2017-08-02 16:34:47 -07:00
zswap.c	mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare()	2017-07-06 16:24:35 -07:00