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mm: memcontrol: zap oom_info_lock

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mem_cgroup_print_oom_info is always called under oom_lock, so
oom_info_lock is redundant.

Signed-off-by: Vladimir Davydov <[email protected]>
Cc: Johannes Weiner <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vladimir Davydov 2016-03-17 14:20:34 -07:00 • committed by Linus Torvalds
commit e0775d10f1
1 changed files with 0 additions and 4 deletions
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4
mm/memcontrol.c
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@ -1150,12 +1150,9 @@ static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
*/
void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
/* oom_info_lock ensures that parallel ooms do not interleave */
static DEFINE_MUTEX(oom_info_lock);
struct mem_cgroup *iter;
unsigned int i;
mutex_lock(&oom_info_lock);
rcu_read_lock();
if (p) {
@ -1199,7 +1196,6 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
pr_cont("\n");
}
mutex_unlock(&oom_info_lock);
}
/*