linux-kernel - Re: [tip:x86/platform] x86/vsmp: Ignore IOAPIC IRQ affinity if possible

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Date:	Thu, 14 Jun 2012 12:51:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Ido Yariv <ido@...ery.com>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, shai@...lemp.com,
	kiran.thirumalai@...il.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org,
	Fengguang Wu <wfg@...ux.intel.com>
Subject: Re: [tip:x86/platform] x86/vsmp: Ignore IOAPIC IRQ affinity if
 possible


* Ido Yariv <ido@...ery.com> wrote:

> Hi Ingo,
> 
> On Mon, Jun 11, 2012 at 10:58:43AM +0200, Ingo Molnar wrote:
> > 
> > * Ido Yariv <ido@...ery.com> wrote:
> > 
> > > This seems to break when CONFIG_PARAVIRT is set but CONFIG_SMP 
> > > isn't. Since there's little point in optimizing IOAPIC routing 
> > > for UP kernels, how about the following fix?
> > 
> > Looks good to me, I'll give it some testing.
> 
> I'm afraid this patch is missing one more config dependency. Since
> no_irq_affinity is declared in proc.c, we need to verify that
> CONFIG_PROC_FS is set before referencing this variable. The below patch
> fixes this.
> 
> Thanks to Fengguang Wu for reporting this.

Please send a delta fix patch on top of latest -tip to fix this.

Thanks,

	Ingo
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