cgroup, memcg: allocate cgroup ID from 1

Currently, cgroup->id is allocated from 0, which is always assigned to
the root cgroup; unfortunately, memcg wants to use ID 0 to indicate
invalid IDs and ends up incrementing all IDs by one.

It's reasonable to reserve 0 for special purposes.  This patch updates
cgroup core so that ID 0 is not used and the root cgroups get ID 1.
The ID incrementing is removed form memcg.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c6c703f2486b..793f70a48820 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -144,8 +144,8 @@ struct cgroup {
         /*
          * idr allocated in-hierarchy ID.
          *
-         * The ID of the root cgroup is always 0, and a new cgroup
-         * will be assigned with a smallest available ID.
+         * ID 0 is not used, the ID of the root cgroup is always 1, and a
+         * new cgroup will be assigned with a smallest available ID.
          *
          * Allocating/Removing ID must be protected by cgroup_mutex.
          */