]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
mm: swap: use mem_cgroup_is_root() instead of deferencing css->parent
authorYang Shi <yang.shi@linux.alibaba.com>
Tue, 5 Mar 2019 23:48:02 +0000 (15:48 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 6 Mar 2019 05:07:19 +0000 (21:07 -0800)
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>
include/linux/swap.h

index 622025ac1461e1d58b8961a1c72df66ecf60efb6..649529be91f2114af9ed955e217d29a1ec6d9e8c 100644 (file)
@@ -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;