linux-kernel - Re: [patch 00/18] SMP: Boot and CPU hotplug refactoring

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Message-ID: <4F9471B9.5050007@tilera.com>
Date:	Sun, 22 Apr 2012 23:01:45 +0200
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [patch 00/18] SMP: Boot and CPU hotplug refactoring - Part 1

On Fri, 2012-04-20 at 13:05 +0000, Thomas Gleixner wrote:
> [...]
> This first part moves the idle thread management for non-boot cpus
> into the core. fork_idle() is called in a workqueue as it is
> implemented in a few architectures already. This is necessary when not
> all cpus are brought up by the early boot code as otherwise we would
> take a ref on the user task VM of the thread which brings the cpu up
> via the sysfs interface.
> 
> This converts all architectures except m32r, mn10300, tile and UM to
> the new core facility. These architecture are calling fork_idle() in
> the very early boot code in smp_prepare_cpus() for unknown reasons.
> I haven't analyzed yet, whether this is on purpose or can be moved
> over to the generic facility. It'd be nice if the responsible maintainers
> could look into that as well.

I will take a look at this for the tile architecture later this week; I'm
out on vacation until Wednesday.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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