linux-kernel - Re: [PATCH 0/4] arch/CPU hotplug: Add missing CPU Hotplug bits to fix nasty issues

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Message-ID: <1332419558.2487.14.camel@twins>
Date:	Thu, 22 Mar 2012 13:32:38 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	rkuo@...eaurora.org, tglx@...utronix.de, linas@...eaurora.org,
	mingo@...e.hu, dhowells@...hat.com,
	yasutake.koichi@...panasonic.com, akpm@...ux-foundation.org,
	benh@...nel.crashing.org, jesper.nilsson@...s.com,
	cmetcalf@...era.com, linux@....linux.org.uk, jejb@...isc-linux.org,
	deller@....de, vapier@...too.org, linux-hexagon@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-am33-list@...hat.com,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH 0/4] arch/CPU hotplug: Add missing CPU Hotplug bits to
 fix nasty issues

On Thu, 2012-03-22 at 13:13 +0100, Peter Zijlstra wrote:
> 
> Furthermore, I was pondering the scenario where a 3rd cpu IPIs the newly
> booting cpu, I suspect we need a smp_wmb() after setting cpu_active and
> a rmb in select_fallback_rq() before reading active.

Hmm, not IPI, that would be covered by the disabling of interrupts on
bringup, but somehow manage to wake a thread that's strictly affine that
the fresh cpu, like queue_work_on() or so.


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