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cgroup: Use RCU_INIT_POINTER(x, NULL) in cgroup.c

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This patch replaces rcu_assign_pointer(x, NULL) with
RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a
structure is carried out before storing a pointer to that structure.
And in the case of the NULL pointer, there is no structure to
initialize.  So, rcu_assign_pointer(p, NULL) can be safely converted
to RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Monam Agarwal 2014-03-24 00:17:18 +05:30 committed by Tejun Heo
parent e1b2dc176f
commit 01a9714061
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup.c
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@ -3545,7 +3545,7 @@ static void css_release(struct percpu_ref *ref)
struct cgroup_subsys_state *css =
container_of(ref, struct cgroup_subsys_state, refcnt);
rcu_assign_pointer(css->cgroup->subsys[css->ss->id], NULL);
RCU_INIT_POINTER(css->cgroup->subsys[css->ss->id], NULL);
call_rcu(&css->rcu_head, css_free_rcu_fn);
}