Commit 1c4448ed authored by Kaixu Xia's avatar Kaixu Xia Committed by Linus Torvalds

mm: memcontrol: simplify value comparison between count and limit

When the variables count and limit have the same value(count == limit),
the result of min(margin, limit - count) statement should be 0 and the
variable margin is set to 0.  So in this case, the min() statement is
not necessary and we can directly set the variable margin to 0.
Signed-off-by: default avatarKaixu Xia <kaixuxia@tencent.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/1587479661-27237-1-git-send-email-kaixuxia@tencent.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a6f5576b
...@@ -1314,7 +1314,7 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg) ...@@ -1314,7 +1314,7 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg)
if (do_memsw_account()) { if (do_memsw_account()) {
count = page_counter_read(&memcg->memsw); count = page_counter_read(&memcg->memsw);
limit = READ_ONCE(memcg->memsw.max); limit = READ_ONCE(memcg->memsw.max);
if (count <= limit) if (count < limit)
margin = min(margin, limit - count); margin = min(margin, limit - count);
else else
margin = 0; margin = 0;
......
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