Messages in this thread Patch in this message | | | From | Johannes Weiner <> | Subject | [patch 5/8] memcg: remove unnecessary !mm check from try_get_mem_cgroup_from_mm() | Date | Fri, 7 Feb 2014 12:04:22 -0500 |
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Users pass either a mm that has been established under task lock, or use a verified current->mm, which means the task can't be exiting.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> --- mm/memcontrol.c | 7 ------- 1 file changed, 7 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e1d7f33227e4..689fffdee471 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1075,13 +1075,6 @@ struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) { struct mem_cgroup *memcg = NULL; - if (!mm) - return NULL; - /* - * Because we have no locks, mm->owner's may be being moved to other - * cgroup. We use css_tryget() here even if this looks - * pessimistic (rather than adding locks here). - */ rcu_read_lock(); do { memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); -- 1.8.5.3
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