linux-kernel - Re: [patch] irq: use config_enabled(SMP) checks to cleanup irq_set

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Message-ID: <1339101083.28766.80.camel@sbsiddha-desk.sc.intel.com>
Date:	Thu, 07 Jun 2012 13:31:23 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	joerg.roedel@....com, paul.gortmaker@...driver.com,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [patch] irq: use config_enabled(SMP) checks to cleanup
 irq_set_affinity() for UP

On Wed, 2012-06-06 at 18:36 -0700, Yinghai Lu wrote:
> On Wed, Jun 6, 2012 at 4:29 PM, Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> > On Ingo's request, re-basing the previous version
> > (http://marc.info/?l=linux-kernel&m=133667389223282) to the latest -tip
> > tree. Thanks.
> > ---
> > From: Suresh Siddha <suresh.b.siddha@...el.com>
> > Subject: irq: use config_enabled(CONFIG_SMP) checks to cleanup irq_set_affinity() for UP
> >
> > Use config_enabled(CONFIG_SMP) checks for cleaning up the ifdef CONFIG_SMP
> > around irq_set_affinity routines in io_apic and irq_remapping subsystems.
> 
> can you just use
> if (nr_cpu_ids > 1)
> checking instead
> if config_enabled(CONFIG_SMP)

Idea is to not have any extra runtime checks if CONFIG_SMP is enabled
and which is when all the smp affinity routines are used/invoked.

thanks,
suresh


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