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| author | Pranith Kumar <bobby.prani@gmail.com> | 2014-11-21 10:05:59 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-11-22 09:33:17 -0500 |
| commit | eadac03e898617521f327faf265932b73ecc3e0f (patch) | |
| tree | 955dd7f66024f1088e7672ca7a9bf9984a08f2e6 /include/linux/percpu-refcount.h | |
| parent | cceb9bd63373061ad7b75c321808a2fb11c86545 (diff) | |
| download | lwn-eadac03e898617521f327faf265932b73ecc3e0f.tar.gz lwn-eadac03e898617521f327faf265932b73ecc3e0f.zip | |
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: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/percpu-refcount.h')
| -rw-r--r-- | include/linux/percpu-refcount.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h index d5c89e0dd0e6..6b0c81872142 100644 --- a/include/linux/percpu-refcount.h +++ b/include/linux/percpu-refcount.h @@ -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; |