linux-kernel - Re: [PATCH v4 1/5] sched/topology: Add check to backup comment about hotplug lock

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Date:   Thu, 14 Jun 2018 16:11:18 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Quentin Perret <quentin.perret@....com>
Cc:     Steven Rostedt <rostedt@...dmis.org>, peterz@...radead.org,
        mingo@...hat.com, linux-kernel@...r.kernel.org,
        luca.abeni@...tannapisa.it, claudio@...dence.eu.com,
        tommaso.cucinotta@...tannapisa.it, bristot@...hat.com,
        mathieu.poirier@...aro.org, lizefan@...wei.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v4 1/5] sched/topology: Add check to backup comment about
 hotplug lock

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. :-(