linux-kernel - Re: [PATCH 2/4] sched: implement __set_cpus

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Message-ID: <1275300165.27810.21858.camel@twins>
Date:	Mon, 31 May 2010 12:02:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 2/4] sched: implement __set_cpus_allowed()

On Mon, 2010-05-31 at 12:01 +0200, Peter Zijlstra wrote:
> >  but we can update cpu_active mask before other
> > CPU_UP_PREPARE notifiers are executed so that it's symmetrical to cpu
> > down path and then this problem goes away the exact same way, right?
> 
> Ah, no, we cannot mark it active before its actually up, because at that
> time we'll actually try and run stuff on it, which clearly won't work
> when its not there to run stuff. 

So we should clear it _before_ we go down, and set it _after_ we're up.


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