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mm: memcontrol: remove bogus NULL check after mem_cgroup_from_task()

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That function acts like a typecast - unless NULL is passed in, no NULL can
come out.  task_in_mem_cgroup() callers don't pass NULL tasks.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2014-12-10 15:44:27 -08:00 committed by Linus Torvalds
parent 312722cbb2
commit c01f46c7c7
1 changed files with 2 additions and 3 deletions
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5
mm/memcontrol.c
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@ -1356,7 +1356,7 @@ static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
bool task_in_mem_cgroup(struct task_struct *task, bool task_in_mem_cgroup(struct task_struct *task,
const struct mem_cgroup *memcg) const struct mem_cgroup *memcg)
{ {
struct mem_cgroup *curr = NULL; struct mem_cgroup *curr;
struct task_struct *p; struct task_struct *p;
bool ret; bool ret;
@ -1372,8 +1372,7 @@ bool task_in_mem_cgroup(struct task_struct *task,
*/ */
rcu_read_lock(); rcu_read_lock();
curr = mem_cgroup_from_task(task); curr = mem_cgroup_from_task(task);
if (curr) css_get(&curr->css);
css_get(&curr->css);
rcu_read_unlock(); rcu_read_unlock();
} }
/* /*