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authorYang Shi <yang.shi@linux.alibaba.com>2019-03-06 02:48:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-06 08:07:19 +0300
commit59118c42a60b997d277ad04d2309a6ec30682e5e (patch)
tree0fb0ac1dfa73f1bcc6e75260b26cf6a54dc0c755 /include/linux/swap.h
parent544029862cbb1d7903e19f2e58f48d4884e1201b (diff)
downloadlinux-59118c42a60b997d277ad04d2309a6ec30682e5e.tar.xz
mm: swap: use mem_cgroup_is_root() instead of deferencing css->parent
mem_cgroup_is_root() is the preferred API to check if memcg is root or not. Use it instead of deferencing css->parent. Link: http://lkml.kernel.org/r/1547232913-118148-1-git-send-email-yang.shi@linux.alibaba.com Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Tim Chen <tim.c.chen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 622025ac1461..649529be91f2 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -625,7 +625,7 @@ 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;