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Date: Mon, 17 Nov 2008 18:38:59 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: fix wakeup_cpu with numaq/es7000 v2
Message-ID: <20081117173859.GB7686@elte.hu>
References: <491FDE2A.1010809@kernel.org> <49200031.2040701@kernel.org> <20081117165224.GH12081@elte.hu> <20081117173728.GA7384@elte.hu>
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* Ingo Molnar <mingo@elte.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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