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mm/memcontrol.c: prevent missed memory.low load tears 

Looks like one of these got missed when massaging in f86b810c26 ("mm,
memcg: prevent memory.low load/store tearing") with other linux-mm
changes.

Link: http://lkml.kernel.org/r/20200612174437.GA391453@chrisdown.name
Signed-off-by: Chris Down <chris@chrisdown.name>
Reported-by: Michal Koutny <mkoutny@suse.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chris Down 2020-06-25 20:30:22 -07:00 committed by Linus Torvalds
parent 3a98990ae2
commit 03960e3318
1 changed files with 3 additions and 2 deletions
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5
mm/memcontrol.c
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@ -6423,7 +6423,7 @@ enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root,
if (parent == root) {
memcg->memory.emin = READ_ONCE(memcg->memory.min);
memcg->memory.elow = memcg->memory.low;
memcg->memory.elow = READ_ONCE(memcg->memory.low);
goto out;
}
@ -6435,7 +6435,8 @@ enum mem_cgroup_protection mem_cgroup_protected(struct mem_cgroup *root,
atomic_long_read(&parent->memory.children_min_usage)));
WRITE_ONCE(memcg->memory.elow, effective_protection(usage, parent_usage,
memcg->memory.low, READ_ONCE(parent->memory.elow),
READ_ONCE(memcg->memory.low),
READ_ONCE(parent->memory.elow),
atomic_long_read(&parent->memory.children_low_usage)));
out: