From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751946AbdK0Kig (ORCPT ); Mon, 27 Nov 2017 05:38:36 -0500 Received: from foss.arm.com ([217.140.101.70]:35764 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751835AbdK0Kid (ORCPT ); Mon, 27 Nov 2017 05:38:33 -0500 From: Mark Rutland To: linux-kernel@vger.kernel.org, mingo@redhat.com Cc: acme@redhat.com, apw@canonical.com, joe@perches.com, mark.rutland@arm.com, paulmck@linux.vnet.ibm.com, peterz@infradead.org Subject: [PATCH 1/4] perf mmap: Convert ACCESS_ONCE() to READ_ONCE() Date: Mon, 27 Nov 2017 10:38:21 +0000 Message-Id: <20171127103824.36526-2-mark.rutland@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171127103824.36526-1-mark.rutland@arm.com> References: <20171127103824.36526-1-mark.rutland@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Recently there was a treewide conversion of ACCESS_ONCE() to {READ,WRITE}_ONCE(), but a new use was introduced concurrently by commit: 1695849735752d2a ("perf mmap: Move perf_mmap and methods to separate mmap.[ch] files") Let's convert this over to READ_ONCE() so that we can remove the ACCESS_ONCE() definitions in subsequent patches. Signed-off-by: Mark Rutland Reviewed-by: Paul E. McKenney Cc: Arnaldo Carvalho de Melo Cc: Ingo Molnar Cc: Joe Perches Cc: Peter Zijlstra --- tools/perf/util/mmap.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h index efd78b827b05..3a5cb5a6e94a 100644 --- a/tools/perf/util/mmap.h +++ b/tools/perf/util/mmap.h @@ -70,7 +70,7 @@ void perf_mmap__read_catchup(struct perf_mmap *md); static inline u64 perf_mmap__read_head(struct perf_mmap *mm) { struct perf_event_mmap_page *pc = mm->base; - u64 head = ACCESS_ONCE(pc->data_head); + u64 head = READ_ONCE(pc->data_head); rmb(); return head; } -- 2.11.0