2021-01-21 08:06:43

by Abaci Team

Subject: [PATCH] mm/memcontrol: remove redundant NULL check

Fix below warnings reported by coccicheck:
./mm/memcontrol.c:451:3-9: WARNING: NULL check before some freeing
functions is not needed.

Reported-by: Abaci Robot <[email protected]>
Signed-off-by: Yang Li <[email protected]>
---
mm/memcontrol.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 605f671..f6a561b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -447,8 +447,7 @@ static void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
for_each_node(nid) {
pn = mem_cgroup_nodeinfo(memcg, nid);
map = rcu_dereference_protected(pn->shrinker_map, true);
- if (map)
- kvfree(map);
+ kvfree(map);
rcu_assign_pointer(pn->shrinker_map, NULL);
}
}
--
1.8.3.1

2021-02-02 10:16:46

by David Hildenbrand

Subject: Re: [PATCH] mm/memcontrol: remove redundant NULL check

On 21.01.21 09:00, Yang Li wrote:
> Fix below warnings reported by coccicheck:
> ./mm/memcontrol.c:451:3-9: WARNING: NULL check before some freeing
> functions is not needed.
>
> Reported-by: Abaci Robot <[email protected]>
> Signed-off-by: Yang Li <[email protected]>
> ---
> mm/memcontrol.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 605f671..f6a561b 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -447,8 +447,7 @@ static void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
> for_each_node(nid) {
> pn = mem_cgroup_nodeinfo(memcg, nid);
> map = rcu_dereference_protected(pn->shrinker_map, true);
> - if (map)
> - kvfree(map);
> + kvfree(map);
> rcu_assign_pointer(pn->shrinker_map, NULL);
> }
> }
>

Reviewed-by: David Hildenbrand <[email protected]>

--
Thanks,

David / dhildenb