linux-kernel - Re: [PATCH -v6 2/5] Migrate shutdown/reboot to boot cpu.

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Message-Id: <20130424151950.1349c3cdfe08d73f684cda81@linux-foundation.org>
Date:	Wed, 24 Apr 2013 15:19:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Robin Holt <holt@....com>, Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Russ Anderson <rja@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Cc:	stable@...nel.org
Subject: Re: [PATCH -v6 2/5] Migrate shutdown/reboot to boot cpu.

On Wed, 24 Apr 2013 15:17:49 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:

> > +static void migrate_to_reboot_cpu(void)
> > +{
> > +	/* The boot cpu is always logical cpu 0 */
> > +	int reboot_cpu_id = 0;
> > +
> > +	cpu_hotplug_disable();
> > +
> > +	/* Make certain the cpu I'm about to reboot on is online */
> > +	if (!cpu_online(reboot_cpu_id))
> > +		reboot_cpu_id = cpumask_first(cpu_online_mask);
> > +
> > +	/* Prevent races with other tasks migrating this task */
> > +	current->flags |= PF_THREAD_BOUND;
> 
> PF_THREAD_BOUND was removed/replaced in linux-next's a9ab775bc
> ("workqueue: directly restore CPU affinity of workers from CPU_ONLINE")

Which means that we'll need an updated patchset for 3.10-rc1, please. 
And when Greg discovers that the patch won't backport correctly, please
provide him with the 3.9.1 version.

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