Michal Hocko 091f362c53 mm, oom: tighten task_will_free_mem() locking ... "mm, oom: fortify task_will_free_mem" has dropped task_lock around task_will_free_mem in oom_kill_process bacause it assumed that a potential race when the selected task exits will not be a problem as the oom_reaper will call exit_oom_victim. Tetsuo was objecting that nommu doesn't have oom_reaper so the race would be still possible. The code would be racy and lockup prone theoretically in other aspects without the oom reaper anyway so I didn't considered this a big deal. But it seems that further changes I am planning in this area will benefit from stable task->mm in this path as well. So let's drop find_lock_task_mm from task_will_free_mem and call it from under task_lock as we did previously. Just pull the task->mm != NULL check inside the function. Link: http://lkml.kernel.org/r/1467201562-6709-1-git-send-email-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Vladimir Davydov <vdavydov@parallels.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-07-28 16:07:41 -07:00
..
kasan	kasan/quarantine: fix bugs on qlist_move_cache()	2016-07-15 14:54:27 +09:00
backing-dev.c
balloon_compaction.c	mm: balloon: use general non-lru movable page feature	2016-07-26 16:19:19 -07:00
bootmem.c
cleancache.c
cma_debug.c
cma.c	mm/cma: silence warnings due to max() usage	2016-05-27 14:49:37 -07:00
cma.h
compaction.c	mm/page_alloc: introduce post allocation processing on page allocator	2016-07-26 16:19:19 -07:00
debug_page_ref.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c	mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED	2016-06-09 14:23:11 -07:00
failslab.c
filemap.c	shmem: add huge pages support	2016-07-26 16:19:19 -07:00
frame_vector.c
frontswap.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
gup.c	thp: file pages support for split_huge_page()	2016-07-26 16:19:19 -07:00
highmem.c
huge_memory.c	thp: fix comments of __pmd_trans_huge_lock()	2016-07-26 16:19:19 -07:00
hugetlb_cgroup.c
hugetlb.c	Merge branch 'akpm' (patches from Andrew)	2016-07-26 19:55:54 -07:00
hwpoison-inject.c
init-mm.c
internal.h	mm: introduce fault_env	2016-07-26 16:19:19 -07:00
interval_tree.c
Kconfig	thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE	2016-07-26 16:19:19 -07:00
Kconfig.debug
khugepaged.c	mm, thp: convert from optimistic swapin collapsing to conservative	2016-07-26 16:19:19 -07:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm: prevent KASAN false positives in kmemleak	2016-06-24 17:23:52 -07:00
ksm.c	mm: do not pass mm_struct into handle_mm_fault	2016-07-26 16:19:19 -07:00
list_lru.c
maccess.c
madvise.c	mm: make mmap_sem for write waits killable for mm syscalls	2016-05-23 17:04:14 -07:00
Makefile	thp: extract khugepaged from mm/huge_memory.c	2016-07-26 16:19:19 -07:00
memblock.c	mm/memblock.c:memblock_add_range(): if nr_new is 0 just return	2016-07-26 16:19:19 -07:00
memcontrol.c	mm, oom: fortify task_will_free_mem()	2016-07-28 16:07:41 -07:00
memory_hotplug.c	memory-hotplug: more general validation of zone during online	2016-07-26 16:19:19 -07:00
memory-failure.c
memory.c	thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE	2016-07-26 16:19:19 -07:00
mempolicy.c	shmem: add huge pages support	2016-07-26 16:19:19 -07:00
mempool.c	mm: mempool: kasan: don't poot mempool objects in quarantine	2016-06-24 17:23:52 -07:00
memtest.c
migrate.c	mm: introduce do_set_pmd()	2016-07-26 16:19:19 -07:00
mincore.c
mlock.c	mm: make mmap_sem for write waits killable for mm syscalls	2016-05-23 17:04:14 -07:00
mm_init.c
mmap.c	shmem: get_unmapped_area align huge page	2016-07-26 16:19:19 -07:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
mremap.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
msync.c
nobootmem.c
nommu.c	mm: introduce fault_env	2016-07-26 16:19:19 -07:00
oom_kill.c	mm, oom: tighten task_will_free_mem() locking	2016-07-28 16:07:41 -07:00
page_alloc.c	mm, rmap: account shmem thp pages	2016-07-26 16:19:19 -07:00
page_counter.c
page_ext.c	mm: use early_pfn_to_nid in page_ext_init	2016-05-27 14:49:37 -07:00
page_idle.c
page_io.c	block, fs, mm, drivers: use bio set/get op accessors	2016-06-07 13:41:38 -06:00
page_isolation.c	mm/page_isolation: clean up confused code	2016-07-26 16:19:19 -07:00
page_owner.c	mm/page_owner: use stackdepot to store stacktrace	2016-07-26 16:19:19 -07:00
page_poison.c	mm: check the return value of lookup_page_ext for all call sites	2016-06-03 15:06:22 -07:00
page-writeback.c	shmem: add huge pages support	2016-07-26 16:19:19 -07:00
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c	percpu: fix synchronization between synchronous map extension and chunk destruction	2016-05-25 11:48:25 -04:00
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c	mm, memcg: use consistent gfp flags during readahead	2016-07-26 16:19:19 -07:00
rmap.c	mm, rmap: account shmem thp pages	2016-07-26 16:19:19 -07:00
shmem.c	shmem: split huge pages beyond i_size under memory pressure	2016-07-26 16:19:19 -07:00
slab_common.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
slab.c	mm/slab: use list_move instead of list_del/list_add	2016-07-26 16:19:19 -07:00
slab.h	mm: memcontrol: cleanup kmem charge functions	2016-07-26 16:19:19 -07:00
slob.c
slub.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_state.c	mm: thp: broken page count after commit aa88b68c3b	2016-06-09 14:23:11 -07:00
swap.c	shmem: add huge pages support	2016-07-26 16:19:19 -07:00
swapfile.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
truncate.c	truncate: handle file thp	2016-07-26 16:19:19 -07:00
userfaultfd.c
util.c	rmap: support file thp	2016-07-26 16:19:19 -07:00
vmacache.c
vmalloc.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
vmpressure.c
vmscan.c	vmscan: split file huge pages before paging them out	2016-07-26 16:19:19 -07:00
vmstat.c	mm, rmap: account shmem thp pages	2016-07-26 16:19:19 -07:00
workingset.c	mm: workingset: printk missing log level, use pr_info()	2016-07-15 14:54:27 +09:00
z3fold.c	mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup	2016-06-03 16:02:55 -07:00
zbud.c
zpool.c
zsmalloc.c	mm: fix build warnings in <linux/compaction.h>	2016-07-26 16:19:19 -07:00
zswap.c