[PATCH] memcontrol: use flexible-array member

From: wenhuizhang <wenhui@gwmail.gwu.edu>
To: unlisted-recipients:; (no To-header on input)
Cc: wenhui@gwmail.gwu.edu, Andrew Morton <akpm@linux-foundation.org>,
	Shakeel Butt <shakeelb@google.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Roman Gushchin <guro@fb.com>, Michal Hocko <mhocko@suse.com>,
	Muchun Song <songmuchun@bytedance.com>,
	Yang Shi <shy828301@gmail.com>, Alex Shi <alexs@kernel.org>,
	Alexander Duyck <alexander.h.duyck@linux.intel.com>,
	Wei Yang <richard.weiyang@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] memcontrol: use flexible-array member
Date: Tue, 18 May 2021 01:20:36 -0400	[thread overview]
Message-ID: <20210518052038.491-1-wenhui@gwmail.gwu.edu> (raw)


Change depracated zero-length-and-one-element-arrays into flexible 
array member.
Zero-length and one-element arrays detected by Lukas's CodeChecker.
Zero/one element arrays causes undefined behaviours if sizeof() used.

https://www.kernel.org/doc/html/latest/processd/deprecated.html


Signed-off-by: wenhuizhang<wenhui@gwmail.gwu.edu>
---
 include/linux/memcontrol.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0ce97eff79e2..f879efb1bc6e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -190,7 +190,7 @@ enum memcg_kmem_state {
 
 #if defined(CONFIG_SMP)
 struct memcg_padding {
-	char x[0];
+	char x[];
 } ____cacheline_internodealigned_in_smp;
 #define MEMCG_PADDING(name)      struct memcg_padding name;
 #else
@@ -349,7 +349,7 @@ struct mem_cgroup {
 	struct deferred_split deferred_split_queue;
 #endif
 
-	struct mem_cgroup_per_node *nodeinfo[0];
+	struct mem_cgroup_per_node *nodeinfo[];
 	/* WARNING: nodeinfo must be the last member here */
 };
 
-- 
2.17.1

