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Re: [patch 10/20] cpu/hotplug: Make target state writeable

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: [patch 10/20] cpu/hotplug: Make target state writeable
Date 2016-02-28 16:00 +0100
Message-ID <r7aZc-3Z9-9@gated-at.bofh.it> (permalink)
References <r6vCG-7sv-3@gated-at.bofh.it> <r6Aj0-2oo-11@gated-at.bofh.it> <r6HNv-88y-7@gated-at.bofh.it> <r6OlY-4r1-3@gated-at.bofh.it>
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Rafael,

On Sat, 27 Feb 2016, Rafael J. Wysocki wrote:
> Say we've taken all of them offline and now we are ready to eject.  If an
> online from sysfs (or any other place) comes in at this point, we'll be
> ejecting a CPU that's potentially doing something which is not awesome.
> 
> That's why we have device_hotplug_lock and some ugly code related to it.
> 
> It extends to parents and children somewhat because of device objects
> representing packages (we want those to be "offline" only if all their
> children are offline) and that's why the lock is held around offline from
> sysfs too.
> 
> I'm not entirely happy with this for quite obvious reasons, but it gets
> the job done ATM.

Understood. I'll fix that thing up so that won't happen and I put it on the
list of things to look at deeper.

Thanks,

	tglx

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Thread

[patch 10/20] cpu/hotplug: Make target state writeable Thomas Gleixner <tglx@linutronix.de> - 2016-02-26 19:50 +0100
  Re: [patch 10/20] cpu/hotplug: Make target state writeable "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-02-27 00:50 +0100
    Re: [patch 10/20] cpu/hotplug: Make target state writeable Thomas Gleixner <tglx@linutronix.de> - 2016-02-27 08:50 +0100
      Re: [patch 10/20] cpu/hotplug: Make target state writeable "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-02-27 15:50 +0100
        Re: [patch 10/20] cpu/hotplug: Make target state writeable Thomas Gleixner <tglx@linutronix.de> - 2016-02-28 16:00 +0100
          Re: [patch 10/20] cpu/hotplug: Make target state writeable Thomas Gleixner <tglx@linutronix.de> - 2016-02-29 17:00 +0100
            Re: [patch 10/20] cpu/hotplug: Make target state writeable "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-01 03:00 +0100
  [tip:smp/hotplug] cpu/hotplug: Make target state writeable tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2016-03-01 21:00 +0100
    Re: [tip:smp/hotplug] cpu/hotplug: Make target state writeable Peter Zijlstra <peterz@infradead.org> - 2016-03-02 13:50 +0100
      Re: [tip:smp/hotplug] cpu/hotplug: Make target state writeable Thomas Gleixner <tglx@linutronix.de> - 2016-03-02 21:00 +0100

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