[Patch v2 1/3] mm/memcg: set memcg after css verified and got reference

[Wei Yang <richard.weiyang@gmail.com>]

Instead of reset memcg when css is either not verified or not got
reference, we can set it after these process.

No functional change, just simplified the code a little.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/memcontrol.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index dc193e83794d..eed9916cdce5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1057,15 +1057,10 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
 		 * is provided by the caller, so we know it's alive
 		 * and kicking, and don't take an extra reference.
 		 */
-		memcg = mem_cgroup_from_css(css);
-
-		if (css == &root->css)
-			break;
-
-		if (css_tryget(css))
+		if (css == &root->css || css_tryget(css)) {
+			memcg = mem_cgroup_from_css(css);
 			break;
-
-		memcg = NULL;
+		}
 	}
 
 	if (reclaim) {
-- 
2.33.1