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cgroup: Simplify cgroup_ancestor 

Simplify cgroup_ancestor function. This is follow-up for
commit 7723628101 ("bpf: Introduce bpf_skb_ancestor_cgroup_id helper")

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrey Ignatov 2018-09-21 17:03:27 -07:00 committed by Tejun Heo
parent 02214bfc89
commit 808c43b7c7
1 changed files with 3 additions and 12 deletions
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15
include/linux/cgroup.h
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@ -567,20 +567,11 @@ static inline bool cgroup_is_descendant(struct cgroup *cgrp,
static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,
int ancestor_level)
{
struct cgroup *ptr;
if (cgrp->level < ancestor_level)
return NULL;
for (ptr = cgrp;
ptr && ptr->level > ancestor_level;
ptr = cgroup_parent(ptr))
;
if (ptr && ptr->level == ancestor_level)
return ptr;
return NULL;
while (cgrp && cgrp->level > ancestor_level)
cgrp = cgroup_parent(cgrp);
return cgrp;
}
/**