From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753224AbeDPQMr (ORCPT ); Mon, 16 Apr 2018 12:12:47 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:59814 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753099AbeDPQLu (ORCPT ); Mon, 16 Apr 2018 12:11:50 -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, Andrea Parri , "Paul E. McKenney" Subject: [PATCH tools/memory-model 16/17] tools/memory-model: Model 'smp_store_mb()' Date: Mon, 16 Apr 2018 09:12:44 -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: 18041616-0056-0000-0000-0000043EB45C 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: 18041616-0057-0000-0000-00000882B7C6 Message-Id: <1523895165-17576-16-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=1011 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 From: Andrea Parri This commit models 'smp_store_mb(x, val);' to be semantically equivalent to 'WRITE_ONCE(x, val); smp_mb();'. Suggested-by: Paolo Bonzini Suggested-by: Peter Zijlstra Signed-off-by: Andrea Parri Signed-off-by: Paul E. McKenney --- tools/memory-model/linux-kernel.def | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def index 397e4e67e8c8..acf86f6f360a 100644 --- a/tools/memory-model/linux-kernel.def +++ b/tools/memory-model/linux-kernel.def @@ -14,6 +14,7 @@ smp_store_release(X,V) { __store{release}(*X,V); } smp_load_acquire(X) __load{acquire}(*X) rcu_assign_pointer(X,V) { __store{release}(X,V); } rcu_dereference(X) __load{once}(X) +smp_store_mb(X,V) { __store{once}(X,V); __fence{mb}; } // Fences smp_mb() { __fence{mb} ; } -- 2.5.2