From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juri Lelli Subject: Re: [PATCH v4 1/5] sched/topology: Add check to backup comment about hotplug lock Date: Thu, 14 Jun 2018 16:11:18 +0200 Message-ID: <20180614141118.GG12032@localhost.localdomain> References: <20180613121711.5018-1-juri.lelli@redhat.com> <20180613121711.5018-2-juri.lelli@redhat.com> <20180614093324.7ea45448@gandalf.local.home> <20180614134234.GC12032@localhost.localdomain> <20180614094747.390357ec@gandalf.local.home> <20180614135040.GE12032@localhost.localdomain> <20180614135800.GM17720@e108498-lin.cambridge.arm.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <20180614135800.GM17720@e108498-lin.cambridge.arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Quentin Perret Cc: Steven Rostedt , peterz@infradead.org, mingo@redhat.com, linux-kernel@vger.kernel.org, luca.abeni@santannapisa.it, claudio@evidence.eu.com, tommaso.cucinotta@santannapisa.it, bristot@redhat.com, mathieu.poirier@linaro.org, lizefan@huawei.com, cgroups@vger.kernel.org On 14/06/18 14:58, Quentin Perret wrote: [...] > Hmm not sure if this can help but I think that rebuild_sched_domains() > does _not_ take the hotplug lock before calling partition_sched_domains() > when CONFIG_CPUSETS=n. But it does take it for CONFIG_CPUSETS=y. Did you mean cpuset_mutex? cpu_hotplug_lock seems to be the problem here.. Can't seem to follow otherwise. :-(