From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753002AbeDPQNU (ORCPT ); Mon, 16 Apr 2018 12:13:20 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:36882 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752201AbeDPQLt (ORCPT ); Mon, 16 Apr 2018 12:11:49 -0400 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Cc: mingo@kernel.org, stern@rowland.harvard.edu, parri.andrea@gmail.com, will.deacon@arm.com, peterz@infradead.org, boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr, akiyks@gmail.com, "Paul E. McKenney" Subject: [PATCH tools/memory-model 15/17] tools/memory-order: smp_mb__after_atomic() orders later RMW operations Date: Mon, 16 Apr 2018 09:12:43 -0700 X-Mailer: git-send-email 2.5.2 In-Reply-To: <20180416161209.GA6895@linux.vnet.ibm.com> References: <20180416161209.GA6895@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18041616-0008-0000-0000-000002F7CC5F X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008863; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000257; SDB=6.01018801; UDB=6.00519703; IPR=6.00798042; MB=3.00020599; MTD=3.00000008; XFM=3.00000015; UTC=2018-04-16 16:11:45 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18041616-0009-0000-0000-000038EBC860 Message-Id: <1523895165-17576-15-git-send-email-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-04-16_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804160146 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current cheat sheet does not claim that smp_mb__after_atomic() orders later RMW atomic operations, which it must, at least against earlier RMW atomic operations and whatever precedes them. This commit therefore adds the needed "Y". Signed-off-by: Paul E. McKenney --- tools/memory-model/Documentation/cheatsheet.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt index d502993ac7d2..94bdc25944d9 100644 --- a/tools/memory-model/Documentation/cheatsheet.txt +++ b/tools/memory-model/Documentation/cheatsheet.txt @@ -14,7 +14,7 @@ smp_wmb() Y W Y Y W smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y smp_mb__before_atomic() CP Y Y Y a a a a Y -smp_mb__after_atomic() CP a a Y Y Y Y Y +smp_mb__after_atomic() CP a a Y Y Y Y Y Y Key: C: Ordering is cumulative -- 2.5.2