linux-kernel - [PATCH] memcg: add BUILD_BUG

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Message-Id: <1421088863-14270-1-git-send-email-gthelen@google.com>
Date:	Mon, 12 Jan 2015 10:54:23 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Greg Thelen <gthelen@...gle.com>
Subject: [PATCH] memcg: add BUILD_BUG_ON() for string tables

Use BUILD_BUG_ON() to compile assert that memcg string tables are in
sync with corresponding enums.  There aren't currently any issues with
these tables.  This is just defensive.

Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
 mm/memcontrol.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ef91e856c7e4..8d1ca6c55480 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3699,6 +3699,10 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 	struct mem_cgroup *mi;
 	unsigned int i;
 
+	BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_stat_names) !=
+		     MEM_CGROUP_STAT_NSTATS);
+	BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_events_names) !=
+		     MEM_CGROUP_EVENTS_NSTATS);
 	BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS);
 
 	for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) {
-- 
2.2.0.rc0.207.ga3a616c

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