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percpu: Replace smp_read_barrier_depends() with lockless_dereference()

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Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Pranith Kumar 2014-11-21 10:05:59 -05:00 committed by Tejun Heo
parent cceb9bd633
commit eadac03e89
1 changed files with 1 additions and 3 deletions
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4
include/linux/percpu-refcount.h
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@ -128,10 +128,8 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
static inline bool __ref_is_percpu(struct percpu_ref *ref,
unsigned long __percpu **percpu_countp)
{
unsigned long percpu_ptr = ACCESS_ONCE(ref->percpu_count_ptr);
/* paired with smp_store_release() in percpu_ref_reinit() */
smp_read_barrier_depends();
unsigned long percpu_ptr = lockless_dereference(ref->percpu_count_ptr);
if (unlikely(percpu_ptr & __PERCPU_REF_ATOMIC))
return false;