From 03960e33187ae969187281c3aa6c308d7282c468 Mon Sep 17 00:00:00 2001 From: Chris Down Date: Thu, 25 Jun 2020 20:30:22 -0700 Subject: mm/memcontrol.c: prevent missed memory.low load tears Looks like one of these got missed when massaging in f86b810c2610 ("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 Reported-by: Michal Koutny Acked-by: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/memcontrol.c b/mm/memcontrol.c index da15b686caa8..19622328e4b5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -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: -- cgit v1.2.3