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Martijn Coenen 6611d8d761 memcg: only free spare array when readers are done 
A spare array holding mem cgroup threshold events is kept around to make
sure we can always safely deregister an event and have an array to store
the new set of events in.

In the scenario where we're going from 1 to 0 registered events, the
pointer to the primary array containing 1 event is copied to the spare
slot, and then the spare slot is freed because no events are left.
However, it is freed before calling synchronize_rcu(), which means
readers may still be accessing threshold->primary after it is freed.

Fixed by only freeing after synchronize_rcu().

Signed-off-by: Martijn Coenen <maco@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-15 17:56:32 -08:00
..
kasan
kasan: fix kmemleak false-positive in kasan_module_alloc()
2015-11-20 16:17:32 -08:00
backing-dev.c
mm: memcontrol: export root_mem_cgroup
2016-01-14 16:00:49 -08:00
balloon_compaction.c
mm: page migration trylock newpage at same level as oldpage
2015-11-05 19:34:48 -08:00
bootmem.c
x86/mm: Introduce max_possible_pfn
2015-12-06 12:46:31 +01:00
cleancache.c
cleancache: remove limit on the number of cleancache enabled filesystems
2015-04-14 16:49:03 -07:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma.c: suppress warning
2015-11-05 19:34:48 -08:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm/compaction.c: __compact_pgdat() code cleanuup
2016-01-14 16:00:49 -08:00
debug-pagealloc.c
mm/debug-pagealloc: make debug-pagealloc boottime configurable
2014-12-13 12:42:48 -08:00
debug.c
mm: rework mapcount accounting to enable 4k mapping of THPs
2016-01-15 17:56:32 -08:00
dmapool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
writeback: implement and use inode_congested()
2015-06-02 08:33:35 -06:00
failslab.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
filemap.c
mm: differentiate page_mapped() from page_mapcount() for compound pages
2016-01-15 17:56:32 -08:00
frame_vector.c
mm: fix docbook comment for get_vaddr_frames()
2015-11-05 19:34:48 -08:00
frontswap.c
frontswap: allow multiple backends
2015-06-24 17:49:45 -07:00
gup.c
mm: bring in additional flag for fixup_user_fault to signal unlock
2016-01-15 17:56:32 -08:00
highmem.c
mm/highmem: make kmap cache coloring aware
2014-08-06 18:01:22 -07:00
huge_memory.c
mm, x86: get_user_pages() for dax mappings
2016-01-15 17:56:32 -08:00
hugetlb_cgroup.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
hugetlb.c
mm: rework mapcount accounting to enable 4k mapping of THPs
2016-01-15 17:56:32 -08:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
…
internal.h
thp: reintroduce split_huge_page()
2016-01-15 17:56:32 -08:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm: re-enable THP
2016-01-15 17:56:32 -08:00
Kconfig.debug
mm/debug_pagealloc: remove obsolete Kconfig options
2015-01-08 15:10:52 -08:00
kmemcheck.c
mm/slab_common: move kmem_cache definition to internal header
2014-10-09 22:25:50 -04:00
kmemleak-test.c
mm/kmemleak-test.c: use pr_fmt for logging
2014-06-06 16:08:18 -07:00
kmemleak.c
Revert "gfp: add __GFP_NOACCOUNT"
2016-01-14 16:00:49 -08:00
ksm.c
mm/ksm.c: mark stable page dirty
2016-01-15 17:56:32 -08:00
list_lru.c
memcg: simplify and inline __mem_cgroup_from_kmem
2015-11-05 19:34:48 -08:00
maccess.c
mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe
2015-11-05 19:34:48 -08:00
madvise.c
mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
2016-01-15 17:56:32 -08:00
Makefile
media updates for v4.3-rc1
2015-09-11 16:42:39 -07:00
memblock.c
mm/memblock: introduce for_each_memblock_type()
2016-01-14 16:00:49 -08:00
memcontrol.c
memcg: only free spare array when readers are done
2016-01-15 17:56:32 -08:00
memory_hotplug.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
memory-failure.c
mm: soft-offline: exit with failure for non anonymous thp
2016-01-15 17:56:32 -08:00
memory.c
mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd
2016-01-15 17:56:32 -08:00
mempolicy.c
mm: mempolicy: skip non-migratable VMAs when setting MPOL_MF_LAZY
2016-01-15 17:56:32 -08:00
mempool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
thp: introduce deferred_split_huge_page()
2016-01-15 17:56:32 -08:00
mincore.c
mm, thp: remove infrastructure for handling splitting PMDs
2016-01-15 17:56:32 -08:00
mlock.c
mm/mlock.c: change can_do_mlock return value type to boolean
2016-01-15 17:56:32 -08:00
mm_init.c
mm: meminit: remove mminit_verify_page_links
2015-06-30 19:44:56 -07:00
mmap.c
mm: fix locking order in mm_take_all_locks()
2016-01-15 17:56:32 -08:00
mmu_context.c
…
mmu_notifier.c
mmu-notifier: add clear_young callback
2015-09-10 13:29:01 -07:00
mmzone.c
mm/mmzone.c: memmap_valid_within() can be boolean
2016-01-14 16:00:49 -08:00
mprotect.c
mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd
2016-01-15 17:56:32 -08:00
mremap.c
mm, thp: remove infrastructure for handling splitting PMDs
2016-01-15 17:56:32 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
x86/mm: Introduce max_possible_pfn
2015-12-06 12:46:31 +01:00
nommu.c
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
oom_kill.c
mm, shmem: add internal shmem resident memory accounting
2016-01-14 16:00:49 -08:00
page_alloc.c
mm/page_alloc.c: remove unused struct zone *z variable
2016-01-15 17:56:32 -08:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_idle.c
mm: add page_check_address_transhuge() helper
2016-01-15 17:56:32 -08:00
page_io.c
fs: use helper bio_add_page() instead of open coding on bi_io_vec
2015-08-13 12:32:00 -06:00
page_isolation.c
mm/page_isolation: do some cleanup in "undo_isolate_page_range"
2016-01-15 17:56:32 -08:00
page_owner.c
mm/page_owner: set correct gfp_mask on page_owner
2015-07-17 16:39:54 -07:00
page-writeback.c
mm: page_alloc: generalize the dirty balance reserve
2016-01-14 16:00:49 -08:00
pagewalk.c
thp: rename split_huge_page_pmd() to split_huge_pmd()
2016-01-15 17:56:32 -08:00
percpu-km.c
percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated
2014-09-02 14:46:05 -04:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
mm/percpu: use offset_in_page macro
2015-11-05 19:34:48 -08:00
pgtable-generic.c
mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd
2016-01-15 17:56:32 -08:00
process_vm_access.c
process_vm_access: switch to {compat_,}import_iovec()
2015-04-11 22:27:12 -04:00
quicklist.c
…
readahead.c
mm: move lru_to_page to mm_inline.h
2016-01-14 16:00:49 -08:00
rmap.c
mm: fix locking order in mm_take_all_locks()
2016-01-15 17:56:32 -08:00
shmem.c
memcg: adjust to support new THP refcounting
2016-01-15 17:56:32 -08:00
slab_common.c
slab: add SLAB_ACCOUNT flag
2016-01-14 16:00:49 -08:00
slab.c
mm/slab.c: add a helper function get_first_slab
2016-01-14 16:00:49 -08:00
slab.h
slab: add SLAB_ACCOUNT flag
2016-01-14 16:00:49 -08:00
slob.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slub.c
page-flags: define PG_locked behavior on compound pages
2016-01-15 17:56:32 -08:00
sparse-vmemmap.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
sparse.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
swap_cgroup.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
swap_state.c
mm: support madvise(MADV_FREE)
2016-01-15 17:56:32 -08:00
swap.c
mm, x86: get_user_pages() for dax mappings
2016-01-15 17:56:32 -08:00
swapfile.c
mm: make swapoff more robust against soft dirty
2016-01-15 17:56:32 -08:00
truncate.c
memcg: add per cgroup dirty page accounting
2015-06-02 08:33:33 -06:00
userfaultfd.c
memcg: adjust to support new THP refcounting
2016-01-15 17:56:32 -08:00
util.c
mm: prepare page_referenced() and page_idle to new THP refcounting
2016-01-15 17:56:32 -08:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm/vmalloc.c: use macro IS_ALIGNED to judge the aligment
2016-01-15 17:56:32 -08:00
vmpressure.c
memcg: avoid vmpressure oops when memcg disabled
2016-01-14 16:00:49 -08:00
vmscan.c
mm: support madvise(MADV_FREE)
2016-01-15 17:56:32 -08:00
vmstat.c
mm: support madvise(MADV_FREE)
2016-01-15 17:56:32 -08:00
workingset.c
list_lru: add helpers to isolate items
2015-02-12 18:54:10 -08:00
zbud.c
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
zsmalloc: reorganize struct size_class to pack 4 bytes hole
2016-01-15 11:40:52 -08:00
zswap.c
mm/zswap: change incorrect strncmp use to strcmp
2015-12-18 14:25:40 -08:00