linux-kernel - Re: [PATCH] Fix the race between smp_call

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Message-ID: <1331546307.18960.26.camel@twins>
Date:	Mon, 12 Mar 2012 10:58:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH] Fix the race between smp_call_function and CPU booting

On Mon, 2012-03-12 at 09:27 +0000, Liu, Chuansheng wrote:
> The solution is just to send smp call to active cpus instead of online
> cpus.

BTW, that solution is broken because !active cpus can still be online
and actually running stuff, so sending IPIs to them is perfectly fine
and actually required.


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