mm: memcontrol: use the preferred form for passing the size of a structure type

Use the preferred form for passing the size of a structure type.  The
alternative form where the structure type is spelled out hurts readability
and introduces an opportunity for a bug when the object type is changed
but the corresponding object identifier to which the sizeof operator is
applied is not.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: https://lkml.kernel.org/r/773e013ff2f07fe2a0b47153f14dea054c0c04f1.1596214831.git.gustavoars@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e3565ec..e71e844 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4264,7 +4264,7 @@ static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg,
        new->entries[size - 1].threshold = threshold;
 
        /* Sort thresholds. Registering of new threshold isn't time-critical */
-       sort(new->entries, size, sizeof(struct mem_cgroup_threshold),
+       sort(new->entries, size, sizeof(*new->entries),
                        compare_thresholds, NULL);
 
        /* Find current threshold */