From: Michal Hocko <mhocko@suse.cz>
Date: Wed, 12 Dec 2012 21:52:23 +0000 (-0800)
Subject: memcg: do not check for mm in __mem_cgroup_count_vm_event
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~33^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c95d26c2ffd3931123d6a7a2489530ccbd36da7a;p=pandora-kernel.git

memcg: do not check for mm in __mem_cgroup_count_vm_event

The mm given to __mem_cgroup_count_vm_event() cannot be NULL because the
function is either called from the page fault path or vma->vm_mm is used.
So the check can be dropped.

The check was introduced by commit 456f998ec817 ("memcg: add the
pagefault count into memcg stats") because the originally proposed patch
used current->mm for shmem but this has been changed to vma->vm_mm later
on without the check being removed (thanks to Hugh for this
recollection).

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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