linux-kernel - [patch 1/3] mm: memcontrol: remove bogus NULL check after mem_cgroup_from

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Message-Id: <1414158589-26094-1-git-send-email-hannes@cmpxchg.org>
Date:	Fri, 24 Oct 2014 09:49:47 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 1/3] mm: memcontrol: remove bogus NULL check after mem_cgroup_from_task()

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@...xchg.org>
---
 mm/memcontrol.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 23cf27cca370..bdf8520979cf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1335,7 +1335,7 @@ static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
 bool task_in_mem_cgroup(struct task_struct *task,
 			const struct mem_cgroup *memcg)
 {
-	struct mem_cgroup *curr = NULL;
+	struct mem_cgroup *curr;
 	struct task_struct *p;
 	bool ret;
 
@@ -1351,8 +1351,7 @@ bool task_in_mem_cgroup(struct task_struct *task,
 		 */
 		rcu_read_lock();
 		curr = mem_cgroup_from_task(task);
-		if (curr)
-			css_get(&curr->css);
+		css_get(&curr->css);
 		rcu_read_unlock();
 	}
 	/*
-- 
2.1.2

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