Johannes Weiner cfa449461e mm: memcg: lookup_page_cgroup (almost) never returns NULL ... Pages have their corresponding page_cgroup descriptors set up before they are used in userspace, and thus managed by a memory cgroup. The only time where lookup_page_cgroup() can return NULL is in the CONFIG_DEBUG_VM-only page sanity checking code that executes while feeding pages into the page allocator for the first time. Remove the NULL checks against lookup_page_cgroup() results from all callsites where we know that corresponding page_cgroup descriptors must be allocated, and add a comment to the callsite that actually does have to check the return value. [hughd@google.com: stop oops in mem_cgroup_update_page_stat()] Signed-off-by: Johannes Weiner <jweiner@redhat.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Balbir Singh <bsingharora@gmail.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-01-12 20:13:06 -08:00
..
backing-dev.c	freezer: implement and use kthread_freezable_should_stop()	2011-11-21 12:32:23 -08:00
bootmem.c	mm: bootmem: try harder to free pages in bulk	2012-01-10 16:30:45 -08:00
bounce.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
cleancache.c	mm: cleancache core ops functions and config	2011-05-26 10:01:36 -06:00
compaction.c	mm: compaction: push isolate search base of compact control one pfn ahead	2012-01-10 16:30:44 -08:00
debug-pagealloc.c	mm, x86: Remove debug_pagealloc_enabled	2011-12-06 09:24:07 +01:00
dmapool.c	mm: fix implicit stat.h usage in dmapool.c	2011-10-31 09:20:12 -04:00
fadvise.c	fadvise: only initiate writeback for specified range with FADV_DONTNEED	2012-01-10 16:30:43 -08:00
failslab.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
filemap_xip.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
filemap.c	memcg: add mem_cgroup_replace_page_cache() to fix LRU issue	2012-01-12 20:13:04 -08:00
fremap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
highmem.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
huge_memory.c	memcg: make mem_cgroup_split_huge_fixup() more efficient	2012-01-12 20:13:05 -08:00
hugetlb.c	mm/hugetlb.c: avoid bogus counter of surplus huge page	2012-01-10 16:30:45 -08:00
hwpoison-inject.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
init-mm.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
internal.h	mm: thp: tail page refcounting fix	2011-11-02 16:06:57 -07:00
Kconfig	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
Kconfig.debug	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemleak-test.c	kmemleak: remove memset by using kzalloc	2011-01-27 18:31:51 +00:00
kmemleak.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
ksm.c	oom: fix race while temporarily setting current's oom_score_adj	2011-10-31 17:30:45 -07:00
maccess.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
madvise.c	fs: kill i_alloc_sem	2011-07-20 20:47:46 -04:00
Makefile	Cross Memory Attach	2011-10-31 17:30:44 -07:00
memblock.c	memblock: Reimplement memblock allocation using reverse free area iterator	2011-12-08 10:22:09 -08:00
memcontrol.c	mm: memcg: lookup_page_cgroup (almost) never returns NULL	2012-01-12 20:13:06 -08:00
memory_hotplug.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
memory-failure.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
memory.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
mempolicy.c	mm/mempolicy.c: mpol_equal(): use bool	2012-01-10 16:30:45 -08:00
mempool.c	mempool: fix first round failure behavior	2012-01-10 16:30:45 -08:00
migrate.c	mm/migrate.c: remove the unused macro lru_to_page	2012-01-10 16:30:46 -08:00
mincore.c	mm: clarify the radix_tree exceptional cases	2011-08-03 14:25:24 -10:00
mlock.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
mm_init.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmap.c	mm: simplify find_vma_prev()	2012-01-10 16:30:44 -08:00
mmu_context.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmu_notifier.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmzone.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
mprotect.c	thp: mprotect: transparent huge page support	2011-01-13 17:32:44 -08:00
mremap.c	mremap: enforce rmap src/dst vma ordering in case of vma_merge() succeeding in copy_vma()	2012-01-10 16:30:44 -08:00
msync.c
nobootmem.c	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
nommu.c	xen: map foreign pages for shared rings by updating the PTEs directly	2011-11-16 12:13:08 -05:00
oom_kill.c	mm: unify remaining mem_cont, mem, etc. variable names to memcg	2012-01-12 20:13:06 -08:00
page_alloc.c	mm: collect LRU list heads into struct lruvec	2012-01-12 20:13:05 -08:00
page_cgroup.c	mm: memcg: remove unused node/section info from pc->flags	2012-01-12 20:13:05 -08:00
page_io.c	block: kill off REQ_UNPLUG	2011-03-10 08:52:27 +01:00
page_isolation.c	mm: page_isolation: codeclean fix comment and rm unneeded val init	2010-10-26 16:52:11 -07:00
page-writeback.c	Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux	2012-01-10 16:59:59 -08:00
pagewalk.c	pagewalk: fix code comment for THP	2011-07-25 20:57:09 -07:00
percpu-km.c
percpu-vm.c	percpu: fix chunk range calculation	2011-11-22 08:09:46 -08:00
percpu.c	percpu: fix per_cpu_ptr_to_phys() handling of non-page-aligned addresses	2011-12-15 11:41:40 -08:00
pgtable-generic.c	mm/pgtable-generic.c: fix CONFIG_SWAP=n build	2011-01-26 10:49:58 +10:00
prio_tree.c	sanitize <linux/prefetch.h> usage	2011-05-20 12:50:29 -07:00
process_vm_access.c	Cross Memory Attach	2011-10-31 17:30:44 -07:00
quicklist.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
readahead.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
rmap.c	mm: unify remaining mem_cont, mem, etc. variable names to memcg	2012-01-12 20:13:06 -08:00
shmem.c	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
slab.c	Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2012-01-11 18:52:23 -08:00
slob.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
slub.c	mm,x86,um: move CMPXCHG_DOUBLE config option	2012-01-12 20:13:03 -08:00
sparse-vmemmap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
sparse.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
swap_state.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
swap.c	mm: make per-memcg LRU lists exclusive	2012-01-12 20:13:05 -08:00
swapfile.c	mm: unify remaining mem_cont, mem, etc. variable names to memcg	2012-01-12 20:13:06 -08:00
thrash.c	mm/thrash.c: quiet sparse noise	2011-10-31 17:30:50 -07:00
truncate.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
util.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
vmalloc.c	mm/vmalloc.c: change void* into explict vm_struct*	2012-01-10 16:30:46 -08:00
vmscan.c	mm: unify remaining mem_cont, mem, etc. variable names to memcg	2012-01-12 20:13:06 -08:00
vmstat.c	mm,x86,um: move CMPXCHG_LOCAL config option	2012-01-12 20:13:03 -08:00