linux-kernel - [tip:locking/core] locking/memory-barriers: Replace smp_cond_acquire() with smp_cond_load

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Date:   Tue, 2 Oct 2018 03:12:50 -0700
From:   tip-bot for Andrea Parri <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     eranian@...gle.com, hpa@...or.com, acme@...hat.com,
        npiggin@...il.com, dlustig@...dia.com,
        linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
        luc.maranget@...ia.fr, boqun.feng@...il.com,
        alexander.shishkin@...ux.intel.com, vincent.weaver@...ne.edu,
        andrea.parri@...rulasolutions.com, akiyks@...il.com,
        jolsa@...hat.com, peterz@...radead.org, dhowells@...hat.com,
        tglx@...utronix.de, will.deacon@....com, mingo@...nel.org,
        j.alglave@....ac.uk, corbet@....net, stern@...land.harvard.edu,
        torvalds@...ux-foundation.org
Subject: [tip:locking/core] locking/memory-barriers: Replace
 smp_cond_acquire() with smp_cond_load_acquire()

Commit-ID:  2f359c7ea554ba9cb78a52c82bedff351cdabd2b
Gitweb:     https://git.kernel.org/tip/2f359c7ea554ba9cb78a52c82bedff351cdabd2b
Author:     Andrea Parri <andrea.parri@...rulasolutions.com>
AuthorDate: Wed, 26 Sep 2018 11:29:20 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 2 Oct 2018 10:28:05 +0200

locking/memory-barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()

Amend the changes in commit:

  1f03e8d2919270 ("locking/barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()")

... by updating the documentation accordingly.

Also remove some obsolete information related to the implementation.

Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: Will Deacon <will.deacon@....com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Cc: Akira Yokosawa <akiyks@...il.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Daniel Lustig <dlustig@...dia.com>
Cc: David Howells <dhowells@...hat.com>
Cc: Jade Alglave <j.alglave@....ac.uk>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Luc Maranget <luc.maranget@...ia.fr>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: linux-arch@...r.kernel.org
Cc: parri.andrea@...il.com
Link: http://lkml.kernel.org/r/20180926182920.27644-5-paulmck@linux.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 Documentation/memory-barriers.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 0d8d7ef131e9..c1d913944ad8 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -471,8 +471,7 @@ And a couple of implicit varieties:
      operations after the ACQUIRE operation will appear to happen after the
      ACQUIRE operation with respect to the other components of the system.
      ACQUIRE operations include LOCK operations and both smp_load_acquire()
-     and smp_cond_acquire() operations. The later builds the necessary ACQUIRE
-     semantics from relying on a control dependency and smp_rmb().
+     and smp_cond_load_acquire() operations.
 
      Memory operations that occur before an ACQUIRE operation may appear to
      happen after it completes.