On Fri 07-02-14 12:04:22, Johannes Weiner wrote:
> 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@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
> ---
> 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
>
--
Michal Hocko
SUSE Labs
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