From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161301AbcIZPhs (ORCPT ); Mon, 26 Sep 2016 11:37:48 -0400 Received: from smtprelay0109.hostedemail.com ([216.40.44.109]:49071 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S941528AbcIZPho (ORCPT ); Mon, 26 Sep 2016 11:37:44 -0400 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1537:1566:1593:1594:1711:1714:1730:1747:1777:1792:2393:2553:2559:2562:2693:3138:3139:3140:3141:3142:3622:3865:3867:3870:3871:3872:3874:5007:6261:7875:10004:10400:10848:10967:11026:11232:11658:11914:12296:12740:12760:13069:13311:13357:13439:14181:14659:14721:21080:30012:30054:30090:30091,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: pie37_2578d9210803e X-Filterd-Recvd-Size: 1571 Date: Mon, 26 Sep 2016 11:37:27 -0400 From: Steven Rostedt To: Peter Zijlstra Cc: mingo@kernel.org, tglx@linutronix.de, juri.lelli@arm.com, xlpang@redhat.com, bigeasy@linutronix.de, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, jdesfossez@efficios.com, bristot@redhat.com, Ingo Molnar Subject: Re: [PATCH -v2 1/9] rtmutex: Deboost before waking up the top waiter Message-ID: <20160926113727.4c08c58c@grimm.local.home> In-Reply-To: <20160926113503.7d0528de@grimm.local.home> References: <20160926123213.851818224@infradead.org> <20160926124127.863639194@infradead.org> <20160926111511.1d963075@grimm.local.home> <20160926152228.GE5016@twins.programming.kicks-ass.net> <20160926113503.7d0528de@grimm.local.home> X-Mailer: Claws Mail 3.14.0 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 26 Sep 2016 11:35:03 -0400 Steven Rostedt wrote: > Especially now that the code after the spin_unlock(&hb->lock) is now a > critical section (preemption is disable). There's nothing obvious in > futex.c that says it is. Not to mention, this looks like it will break PREEMPT_RT as wake_up_q() calls sleepable spin locks. -- Steve