percpu: READ_ONCE() now implies smp_read_barrier_depends()

[linux-2.6-microblaze.git] / lib / percpu-refcount.c

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index fe03c6d..30e7dd8 100644 (file)
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -197,10 +197,10 @@ static void __percpu_ref_switch_to_percpu(struct percpu_ref *ref)
        atomic_long_add(PERCPU_COUNT_BIAS, &ref->count);
 
        /*
-        * Restore per-cpu operation.  smp_store_release() is paired with
-        * smp_read_barrier_depends() in __ref_is_percpu() and guarantees
-        * that the zeroing is visible to all percpu accesses which can see
-        * the following __PERCPU_REF_ATOMIC clearing.
+        * Restore per-cpu operation.  smp_store_release() is paired
+        * with READ_ONCE() in __ref_is_percpu() and guarantees that the
+        * zeroing is visible to all percpu accesses which can see the
+        * following __PERCPU_REF_ATOMIC clearing.
         */
        for_each_possible_cpu(cpu)
                *per_cpu_ptr(percpu_count, cpu) = 0;