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McKenney" To: Peter Zijlstra Cc: Andrea Parri , Will Deacon , Alan Stern , LKMM Maintainers -- Akira Yokosawa , Boqun Feng , Daniel Lustig , David Howells , Jade Alglave , Luc Maranget , Nicholas Piggin , Kernel development list , Linus Torvalds Subject: Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire Reply-To: paulmck@linux.vnet.ibm.com References: <20180710093821.GA5414@andrea> <20180711094310.GA13963@arm.com> <20180711123421.GA9673@andrea> <20180712074040.GA4920@worktop.programming.kicks-ass.net> <20180712115249.GA6201@andrea> <20180712134821.GT2494@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180712134821.GT2494@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 18071216-0068-0000-0000-00000317260F X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009357; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01060331; UDB=6.00544266; IPR=6.00838250; MB=3.00022118; MTD=3.00000008; XFM=3.00000015; UTC=2018-07-12 16:17:41 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18071216-0069-0000-0000-00004501CB5B Message-Id: <20180712161957.GR3593@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-07-12_06:,, 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 mlxscore=0 impostorscore=0 mlxlogscore=613 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1807120171 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 12, 2018 at 03:48:21PM +0200, Peter Zijlstra wrote: [ . . . ] > I'm still hoping we can convince the PowerPC people that they're wrong, > and get rid of this wart and just call all locks RCsc. As always, I must defer to the PowerPC maintainers on this point. Thanx, Paul