smp_read_barrier_depends() doesn't exist any more, so reword the two
comments that mention it to refer to "dependency ordering" instead.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
         * between contaminating the pointer value, meaning that
         * READ_ONCE() is required when fetching it.
         *
-        * The smp_read_barrier_depends() implied by READ_ONCE() pairs
+        * The dependency ordering from the READ_ONCE() pairs
         * with smp_store_release() in __percpu_ref_switch_to_percpu().
         */
        percpu_ptr = READ_ONCE(ref->percpu_count_ptr);
 
                return -ENOSPC;
 
        /* Make sure the pointer we are storing points to a valid data. */
-       /* Pairs with smp_read_barrier_depends in __ptr_ring_consume. */
+       /* Pairs with the dependency ordering in __ptr_ring_consume. */
        smp_wmb();
 
        WRITE_ONCE(r->queue[r->producer++], ptr);