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Tue, 2 Feb 2021 10:12:07 +0000 (UTC) Received: from [10.36.114.148] (ovpn-114-148.ams2.redhat.com [10.36.114.148]) by smtp.corp.redhat.com (Postfix) with ESMTP id 02E2B10016FB; Tue, 2 Feb 2021 10:12:05 +0000 (UTC) Subject: Re: [PATCH] mm/memcontrol: remove redundant NULL check To: Yang Li , hannes@cmpxchg.org Cc: mhocko@kernel.org, vdavydov.dev@gmail.com, akpm@linux-foundation.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1611216029-34397-1-git-send-email-abaci-bugfix@linux.alibaba.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <187faa43-dc1c-d0a9-769c-b8d99b954c32@redhat.com> Date: Tue, 2 Feb 2021 11:12:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <1611216029-34397-1-git-send-email-abaci-bugfix@linux.alibaba.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > Signed-off-by: Yang Li > --- > 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 -- Thanks, David / dhildenb