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authorLi Zefan <lizefan@huawei.com>2013-03-29 14:37:29 +0800
committerIngo Molnar <mingo@kernel.org>2013-04-10 13:54:18 +0200
commit543bc0e76e6bb84300eaf9833edc5a481f788678 (patch)
treeb3584f05bedffee2bd604fa63d0e8b613cda28d4 /kernel/sched/cpuacct.h
parent1966aaf7d54608e8ddb7ac454b461840e763409a (diff)
sched/cpuacct: Remove redundant NULL checks in cpuacct_charge()
This is a micro optimization for the hot path. - We don't need to check if @ca is NULL in parent_ca(). - We don't need to check if @ca is NULL in the beginning of the for loop. Signed-off-by: Li Zefan <lizefan@huawei.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/515536A9.5000700@huawei.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/cpuacct.h')
-rw-r--r--kernel/sched/cpuacct.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/cpuacct.h b/kernel/sched/cpuacct.h
index bd0409b8552..45c168207fc 100644
--- a/kernel/sched/cpuacct.h
+++ b/kernel/sched/cpuacct.h
@@ -36,7 +36,7 @@ static inline struct cpuacct *task_ca(struct task_struct *tsk)
static inline struct cpuacct *parent_ca(struct cpuacct *ca)
{
- if (!ca || !ca->css.cgroup->parent)
+ if (!ca->css.cgroup->parent)
return NULL;
return cgroup_ca(ca->css.cgroup->parent);
}