linux-kernel - [PATCH] memcontrol: use flexible-array member

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Message-Id: <20210518052038.491-1-wenhui@gwmail.gwu.edu>
Date:   Tue, 18 May 2021 01:20:36 -0400
From:   wenhuizhang <wenhui@...ail.gwu.edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     wenhui@...ail.gwu.edu, Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        Muchun Song <songmuchun@...edance.com>,
        Yang Shi <shy828301@...il.com>, Alex Shi <alexs@...nel.org>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Wei Yang <richard.weiyang@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] memcontrol: use flexible-array member 


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@...ail.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