From: Yang Shi <yang.shi@linux.alibaba.com>
To: ying.huang@intel.com, tim.c.chen@intel.com, akpm@linux-foundation.org
Cc: yang.shi@linux.alibaba.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] mm: swap: use mem_cgroup_is_root() instead of deferencing css->parent
Date: Sat, 12 Jan 2019 02:55:13 +0800 [thread overview]
Message-ID: <1547232913-118148-1-git-send-email-yang.shi@linux.alibaba.com> (raw)
mem_cgroup_is_root() is preferred API to check if memcg is root or not.
Use it instead of deferencing css->parent.
Cc: Huang Ying <ying.huang@intel.com>
Cc: Tim Chen <tim.c.chen@intel.com>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
include/linux/swap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index a8f6d5d..8739063 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -623,7 +623,7 @@ static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
return vm_swappiness;
/* root ? */
- if (mem_cgroup_disabled() || !memcg->css.parent)
+ if (mem_cgroup_disabled() || mem_cgroup_is_root(memcg))
return vm_swappiness;
return memcg->swappiness;
--
1.8.3.1
next reply other threads:[~2019-01-11 19:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-11 18:55 Yang Shi [this message]
2019-01-11 19:11 ` Michal Hocko
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