linux-kernel - Re: [PATCH][for 2.6.28] powerpc: Use physical cpu id when setting the processor affinity

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Message-Id: <EAAB7B1A-49DC-4D61-A76F-F87C777566D8@kernel.crashing.org>
Date:	Tue, 2 Dec 2008 17:05:25 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Paul Mackerras <paulus@...ba.org>, Andrew Morton <akpm@...l.org>,
	linuxppc-dev@...abs.org, Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][for 2.6.28] powerpc: Use physical cpu id when setting the processor affinity


On Dec 2, 2008, at 3:30 PM, Benjamin Herrenschmidt wrote:

> On Tue, 2008-12-02 at 13:37 -0600, Kumar Gala wrote:
>> In the CONFIG_SMP case the irq_choose_cpu() code was returning back
>> a logical cpu id not the physical id.  We were writing that directly
>> into the HW register.
>>
>> We need to be calling get_hard_smp_processor_id() so irq_choose_cpu()
>> always returns a physical cpu id.
>
> That will probably do for now but if we ever move that routine to
> generic code, I'd rather have the caller do the conversion.

Fair.. I felt at this point matching what the !CONFIG_SMP case of  
irq_choose_cpu() is doing was the best choice.

- k
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