linux-kernel - Re: [patch V2 00/24] cpu/hotplug: Convert get_online_cpus() to a percpu

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Date:   Thu, 27 Apr 2017 10:27:20 +0200
From:   Sebastian Siewior <bigeasy@...utronix.de>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Suzuki K Poulose <Suzuki.Poulose@....com>, catalin.marinas@....com,
        will.deacon@....com, Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [patch V2 00/24] cpu/hotplug: Convert get_online_cpus() to a
 percpu_rwsem

On 2017-04-26 11:32:36 [+0100], Mark Rutland wrote:
> > So we could end up calling static_branch_enable_cpuslocked()
> > without actually holding the lock. Should we do a cpu_hotplug_begin/done in
> > setup_cpu_feature_capabilities ? I agree it doesn't look that nice. Thoughts ?
> 
> I agree that's hideous, but it looks like the only choice given the
> hotplug rwsem cahnges. :/

would work for you to provide a locked and unlocked version?

> I can spin a v2 with that and the typo fixes.
> 
> Thanks,
> Mark.

Sebastian