linux-kernel - Re: [PATCH] x86: Don't send RESCHEDULE

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Message-ID: <47D5549D.8090402@tiscali.nl>
Date:	Mon, 10 Mar 2008 16:32:45 +0100
From:	Roel Kluin <12o3l@...cali.nl>
To:	ego@...ibm.com
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [PATCH] x86: Don't send RESCHEDULE_VECTOR to offlined cpus

Gautham R Shenoy wrote:
> On Mon, Mar 10, 2008 at 01:24:18PM +0100, Ingo Molnar wrote:
>> * Gautham R Shenoy <ego@...ibm.com> wrote:
>>
>>> x86: Don't send RESCHEDULE_VECTOR to offlined cpus.
>>> From: Gautham R Shenoy <ego@...ibm.com>
>>>
>>> In the x86 native_smp_send_reschedule_function(), don't send the IPI 
>>> if the cpu has gone offline already. Warn nevertheless!!
>> have you seen this happen?
> 
> Yup, this afternoon while running
> cpu-hotplug stress tests (http://lkml.org/lkml/2008/3/3/11)
> in parallel with kern-bench, I got this on the serial console.

from arch/m32r/kernel/smp.c:134

void smp_send_reschedule(int cpu_id)
{
        WARN_ON(cpu_is_offline(cpu_id));
        send_IPI_mask(cpumask_of_cpu(cpu_id), RESCHEDULE_IPI, 1);
}

should this be changed as well?
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