linux-kernel - Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

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Message-ID: <20130417115820.GF3658@sgi.com>
Date:	Wed, 17 Apr 2013 06:58:20 -0500
From:	Robin Holt <holt@....com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Robin Holt <holt@....com>, Ingo Molnar <mingo@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, Russ Anderson <rja@....com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Joe Perches <joe@...ches.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

> The get/put_online_cpus() doesn't help in this case, because if a
> hotplug operation is started _after_ this function returns, then
> your task will get force migrated - which makes the get/put_online_cpus()
> pointless. What we need to do is *disable* CPU hotplug altogether.
> We need not even enable it back, since we are rebooting/powering off
> anyway.
> 
> So how about using the following patch in your series and using
> cpu_hotplug_disable() to achieve the goal?

I will incorporate it before my patch and utilize.  Thank you very
much as I was at a loss as to what I should be doing.

Robin
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