[PATCH] memcg: cleanup root memcg checks
From: Shakeel Butt <hidden>
Date: 2021-02-23 20:57:39
Also in:
linux-mm, lkml
Subsystem:
control group - memory resource controller (memcg), memory management, the rest · Maintainers:
Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Andrew Morton, Linus Torvalds
Replace the implicit checking of root memcg with explicit root memcg checking i.e. !css->parent with mem_cgroup_is_root(). Signed-off-by: Shakeel Butt <redacted> --- mm/memcontrol.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index dcb5665aeb69..79046ad3eec0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c@@ -4141,7 +4141,7 @@ static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css, if (val > 100) return -EINVAL; - if (css->parent) + if (!mem_cgroup_is_root(memcg)) memcg->swappiness = val; else vm_swappiness = val;
@@ -4491,7 +4491,7 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css, struct mem_cgroup *memcg = mem_cgroup_from_css(css); /* cannot set to root cgroup and only 0 and 1 are allowed */ - if (!css->parent || !((val == 0) || (val == 1))) + if (mem_cgroup_is_root(memcg) || !((val == 0) || (val == 1))) return -EINVAL; memcg->oom_kill_disable = val;
--
2.30.0.617.g56c4b15f3c-goog