Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Pull percpu updates from Tejun Heo:
 "Nothing interesting.  A patch to convert the remaining __get_cpu_var()
  users, another to fix non-critical off-by-one in an assertion and a
  cosmetic conversion to lockless_dereference() in percpu-ref.

  The back-merge from mainline is to receive lockless_dereference()"

* 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: Replace smp_read_barrier_depends() with lockless_dereference()
  percpu: Convert remaining __get_cpu_var uses in 3.18-rcX
  percpu: off by one in BUG_ON()

1 files changed, 1 insertions, 3 deletions

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 530b249f7ea4..b4337646388b 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);
 
         /*
          * Theoretically, the following could test just ATOMIC; however,