The patch titled
Subject: cgroup: remove unnecessary 0 check from css_from_id()
has been added to the -mm tree. Its filename is
cgroup-remove-unnecessary-0-check-from-css_from_id.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/cgroup-remove-unnecessary-0-check-from-css_from_id.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/cgroup-remove-unnecessary-0-check-from-css_from_id.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: cgroup: remove unnecessary 0 check from css_from_id()
css_idr allocation starts at 1, so index 0 will never point to an item.
css_from_id() currently filters that before asking idr_find(), but
idr_find() would also just return NULL, so this is not needed.
Link: http://lkml.kernel.org/r/20160617162427.GC19084@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Nikolay Borisov <kernel@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/cgroup.c~cgroup-remove-unnecessary-0-check-from-css_from_id kernel/cgroup.c
--- a/kernel/cgroup.c~cgroup-remove-unnecessary-0-check-from-css_from_id
+++ a/kernel/cgroup.c
@@ -6162,7 +6162,7 @@ struct cgroup_subsys_state *css_tryget_o
struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss)
{
WARN_ON_ONCE(!rcu_read_lock_held());
- return id > 0 ? idr_find(&ss->css_idr, id) : NULL;
+ return idr_find(&ss->css_idr, id);
}
/**
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
cgroup-fix-idr-leak-for-the-first-cgroup-root.patch
cgroup-remove-unnecessary-0-check-from-css_from_id.patch
mm-memcontrol-fix-cgroup-creation-failure-after-many-small-jobs.patch
mm-memcontrol-fix-cgroup-creation-failure-after-many-small-jobs-fix.patch
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