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

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A054D70@SHSMSX101.ccr.corp.intel.com>
Date:	Tue, 13 Mar 2012 06:46:15 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
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



> -----Original Message-----
> From: Peter Zijlstra [mailto:peterz@...radead.org]
> Sent: Monday, March 12, 2012 5:58 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@...r.kernel.org; Yanmin Zhang; 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.
> 
Based on current code base, the IPI can be handled only after the cpu is active, before CPU is active,
Any sending IPI is meanless.
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