linux-kernel - Re: [PATCH] kernel/cpu.c: Move the CPU

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Message-ID: <48C2B90C.8000205@colorfullife.com>
Date:	Sat, 06 Sep 2008 19:08:28 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] kernel/cpu.c: Move the CPU_DYING notifiers

Ingo Molnar wrote:
> * Manfred Spraul <manfred@...orfullife.com> wrote:
>   
>> -	raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
>> -				param->hcpu);
>>  	/* Ensure this CPU doesn't handle any more interrupts. */
>>  	err = __cpu_disable();
>>  	if (err < 0)
>>  		return err;
>>  
>> +	raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
>> +				param->hcpu);
>>     
>
> hm, doesnt this break things like CPU cross-calls done in CPU_DYING 
> callbacks?
>   
We are within stop_machine(). No other cpu is running. As fas as I can 
see no cross-calls are possible.

Which scenario do you think about?

--
    Manfred
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