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KAMEZAWA Hiroyuki 747388d78a memcg: fix css_is_ancestor() RCU locking 
Some callers (in memcontrol.c) calls css_is_ancestor() without
rcu_read_lock.  Because css_is_ancestor() has to access RCU protected
data, it should be under rcu_read_lock().

This makes css_is_ancestor() itself does safe access to RCU protected
area.  (At least, "root" can have refcnt==0 if it's not an ancestor of
"child".  So, we need rcu_read_lock().)

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-11 17:33:42 -07:00
..
backing-dev.c Catch filesystems lacking s_bdi 2010-04-25 08:54:42 +02:00
bootmem.c Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip 2010-04-07 11:02:23 -07:00
bounce.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
debug-pagealloc.c
dmapool.c
fadvise.c readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM 2010-03-06 11:26:25 -08:00
failslab.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
filemap_xip.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
filemap.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
fremap.c mm: clean up mm_counter 2010-03-06 11:26:23 -08:00
highmem.c
hugetlb.c hugetlbfs: kill applications that use MAP_NORESERVE with SIGBUS instead of OOM-killer 2010-05-11 17:33:42 -07:00
hwpoison-inject.c
init-mm.c
internal.h
Kconfig Merge branch 'x86-bootmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-03 08:15:05 -08:00
Kconfig.debug
kmemcheck.c kmemcheck: Fix build errors due to missing slab.h 2010-03-30 22:02:32 +09:00
kmemleak-test.c
kmemleak.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ksm.c ksm: check for ERR_PTR from follow_page() 2010-04-24 11:31:26 -07:00
maccess.c
madvise.c
Makefile percpu: don't implicitly include slab.h from percpu.h 2010-03-30 22:02:32 +09:00
memcontrol.c memcg: fix css_is_ancestor() RCU locking 2010-05-11 17:33:42 -07:00
memory_hotplug.c mm: introduce dump_page() and print symbolic flag names 2010-03-12 15:52:28 -08:00
memory-failure.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
memory.c mm: avoid null-pointer deref in sync_mm_rss() 2010-04-07 08:38:02 -07:00
mempolicy.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mempool.c
migrate.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mincore.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mlock.c mm: use rlimit helpers 2010-03-06 11:26:24 -08:00
mm_init.c
mmap.c mmap: check ->vm_ops before dereferencing 2010-04-27 08:26:51 -07:00
mmu_context.c exit: fix oops in sync_mm_rss 2010-03-24 16:31:21 -07:00
mmu_notifier.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mmzone.c
mprotect.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
mremap.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
msync.c
nommu.c NOMMU: Fix __get_user_pages() to pin last page on offset buffers 2010-03-25 14:13:27 -07:00
oom_kill.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
page_alloc.c mm: introduce dump_page() and print symbolic flag names 2010-03-12 15:52:28 -08:00
page_cgroup.c memcg: avoid use cmpxchg in swap cgroup maintainance 2010-03-17 18:43:47 -07:00
page_io.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
page_isolation.c
page-writeback.c
pagewalk.c pagemap: fix pfn calculation for hugepage 2010-04-07 08:38:04 -07:00
percpu_up.c percpu: don't implicitly include slab.h from percpu.h 2010-03-30 22:02:32 +09:00
percpu.c percpu, module: implement and use is_kernel/module_percpu_address() 2010-03-29 23:07:12 +09:00
prio_tree.c
quicklist.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
readahead.c readahead: fix NULL filp dereference 2010-04-07 08:38:03 -07:00
rmap.c rmap: remove anon_vma check in page_address_in_vma() 2010-05-11 17:33:42 -07:00
shmem.c
slab.c slab: Generify kernel pointer validation 2010-04-09 10:09:50 -07:00
slob.c
slub.c slub: Fix bad boundary check in init_kmem_cache_nodes() 2010-05-05 21:12:19 +03:00
sparse-vmemmap.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sparse.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
swap_state.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
swap.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
swapfile.c memcg: move charges of anonymous swap 2010-03-12 15:52:36 -08:00
thrash.c
truncate.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
util.c slab: Generify kernel pointer validation 2010-04-09 10:09:50 -07:00
vmalloc.c
vmscan.c mm: revert "vmscan: get_scan_ratio() cleanup" 2010-04-07 08:38:03 -07:00
vmstat.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00