[PATCH RFC 2/4] mm: kmem: remove redundant checks from get_obj_cgroup_from_current()

Roman Gushchin
2020-08-27T17:52:23Z

There are checks for current->mm and current->active_memcg
in get_obj_cgroup_from_current(), but these checks are redundant:
memcg_kmem_bypass() called just above performs same checks.

Signed-off-by: Roman Gushchin <guro@fb.com>
---
mm/memcontrol.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9c08d8d14bc0..5d847257a639 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2919,9 +2919,6 @@ __always_inline struct obj_cgroup *get_obj_cgroup_from_current(void)
if (memcg_kmem_bypass())
return NULL;

- if (unlikely(!current->mm && !current->active_memcg))
- return NULL;
-
rcu_read_lock();
if (unlikely(current->active_memcg))
memcg = rcu_dereference(current->active_memcg);
--
2.26.2