linux-kernel - [PATCH 12/13] include/linux: Remove smp_read_barrier

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Date:   Fri,  8 Nov 2019 17:01:19 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>, Yunjae Lee <lyj7694@...il.com>,
        SeongJae Park <sj38.park@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Matt Turner <mattst88@...il.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Richard Henderson <rth@...ddle.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
        Boqun Feng <boqun.feng@...il.com>, linux-alpha@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH 12/13] include/linux: Remove smp_read_barrier_depends() from comments

'smp_read_barrier_depends()' doesn't exist any more, so reword the two
comments that mention it to refer to "dependency ordering" instead.

Signed-off-by: Will Deacon <will@...nel.org>
---
 include/linux/percpu-refcount.h | 2 +-
 include/linux/ptr_ring.h        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 7aef0abc194a..246760b93715 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -155,7 +155,7 @@ static inline bool __ref_is_percpu(struct percpu_ref *ref,
 	 * 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);
diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h
index 0abe9a4fc842..b6e94b60fc12 100644
--- a/include/linux/ptr_ring.h
+++ b/include/linux/ptr_ring.h
@@ -106,7 +106,7 @@ static inline int __ptr_ring_produce(struct ptr_ring *r, void *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);
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog