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Commit eadac03e authored by Pranith Kumar's avatar Pranith Kumar Committed by Tejun Heo
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percpu: Replace smp_read_barrier_depends() with lockless_dereference() 



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: default avatarPranith Kumar <bobby.prani@gmail.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent cceb9bd6

include/linux/percpu-refcount.h

+1 −3
Original line number Diff line number Diff line
@@ -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;