linux-kernel - Re: [PATCH] x86: fix wakeup

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Message-ID: <20081117173859.GB7686@elte.hu>
Date:	Mon, 17 Nov 2008 18:38:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix wakeup_cpu with numaq/es7000 v2


* Ingo Molnar <mingo@...e.hu> wrote:

> hm, one of my testboxes is rather unhappy about your patch:
> 
> [   54.718062] SMP alternatives: switching to SMP code
> [   55.083610] Booting processor 1 APIC 0x1 ip 0x6000
> [   55.088329] BUG: unable to handle kernel paging request at ffffffff817b0880
> [   55.092304] IP: [<ffffffff80f5ce20>] native_cpu_up+0x410/0xf30

triggered via:

echo 0 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 1 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 0 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 1 > /sys/devices/system/cpu/cpu1/online
sleep 1

	Ingo
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