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From: Kumar Gala <>
Cc: David Miller <>,,,,,,
Subject: Re: [PATCH] genirq: Set initial default irq affinity to just CPU0
Date: Mon, 27 Oct 2008 08:43:11 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1225002815.7654.487.camel@pasglop>

On Oct 26, 2008, at 1:33 AM, Benjamin Herrenschmidt wrote:

> On Sat, 2008-10-25 at 21:04 -0700, David Miller wrote:
>> But back to my original wonder, since I've always tipped off of this
>> generic IRQ layer cpu mask, when was it ever defaulting to zero
>> and causing the behvaior your powerpc guys actually want? :-)
> Well, I'm not sure what Kumar wants. Most powerpc SMP setups actually
> want to spread interrupts to all CPUs, and those who can't tend to  
> just
> not implement set_affinity... So Kumar must have a special case of  
> usage here on FSL platforms.
> In any case, the platform limitations should be dealt with there or  
> the
> user could break it by manipulating affinity via /proc anyway.
> By yeah, I do expect default affinity to be all CPUs and in fact, I  
> even
> have an -OLD- comment in the code that says
> 	/* let the mpic know we want intrs. default affinitya is  
> 0xffffffff ...

While we have the comment the code appears not to really follow it.   
We appear to write 1 << hard_smp_processor_id().

- k

  reply	other threads:[~2008-10-27 13:44 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-24 15:57 Kumar Gala
2008-10-24 23:18 ` David Miller
2008-10-25 21:33   ` Benjamin Herrenschmidt
2008-10-26  4:04     ` David Miller
2008-10-26  6:33       ` Benjamin Herrenschmidt
2008-10-27 13:43         ` Kumar Gala [this message]
2008-10-27 20:27           ` Benjamin Herrenschmidt
2008-10-27 20:45             ` Kumar Gala

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