linux-kernel - Re: [Fwd: [PATCH] x86/smp: Fix cpuN startup panic]

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Message-ID: <50248195.9080401@zytor.com>
Date:	Thu, 09 Aug 2012 20:35:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	yanmin_zhang@...ux.intel.com
CC:	mingo@...hat.com, tglx@...utronix.de, linx.z.chen@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [Fwd: [PATCH] x86/smp: Fix cpuN startup panic]

On 08/09/2012 05:35 PM, Yanmin Zhang wrote:
> Peter,
>
> What's your opinion about the patch? We hit it when enabling Medfield Android mobile.
> This patch would put AP to a loop.
>
> Another method to fix it is just to enlarge the wait time, for example, from 2HZ to 10HZ.
>

Hmm... and I presume running with preemption disabled doesn't work for 
hotplug (not that this is a hotplug situation)...

2 seconds is a *long* time, but I guess there isn't really nay harm in 
making it 10 seconds in the sense that the system is basically dead at 
that point...

tglx - you have been looking at the CPU startup lately, any opinions?

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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