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@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6187ca4d5dc2..dc5c4cd0afdf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3568,6 +3568,10 @@ 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++) {