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memcg: fix build warning and avoid checking for mem != null again and again 

Fix build warning, "mem_cgroup_is_obsolete defined but not used" when
CONFIG_DEBUG_VM is not set.  Also avoid checking for !mem again and again.

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: 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>
This commit is contained in:
Nikanth Karthikesan 2009-05-28 14:34:41 -07:00 committed by Linus Torvalds
parent f83a275dbc
commit 46f7e602fb
1 changed files with 1 additions and 9 deletions
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10
mm/memcontrol.c
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@ -314,14 +314,6 @@ static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
return mem;
}
static bool mem_cgroup_is_obsolete(struct mem_cgroup *mem)
{
if (!mem)
return true;
return css_is_removed(&mem->css);
}
/*
* Call callback function against all cgroup under hierarchy tree.
*/
@ -932,7 +924,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
if (unlikely(!mem))
return 0;
VM_BUG_ON(!mem || mem_cgroup_is_obsolete(mem));
VM_BUG_ON(css_is_removed(&mem->css));
while (1) {
int ret;