linux-kernel - [PATCH v2] memcontrol: use flexible-array member

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Date:   Tue, 18 May 2021 16:09:08 -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 v2] 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.

Signed-off-by: wenhuizhang <wenhui@...ail.gwu.edu>
---
 include/linux/memcontrol.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0ce97eff79e2..3cc18c2176e7 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -349,8 +349,7 @@ struct mem_cgroup {
 	struct deferred_split deferred_split_queue;
 #endif
 
-	struct mem_cgroup_per_node *nodeinfo[0];
-	/* WARNING: nodeinfo must be the last member here */
+	struct mem_cgroup_per_node *nodeinfo[];
 };
 
 /*
-- 
2.17.1