linux-kernel - Re: [RFC PATCH 1/5] ARM: remove useless guard in smp.c

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Message-ID: <20130102111405.GA25907@e106331-lin.cambridge.arm.com>
Date:	Wed, 2 Jan 2013 11:14:05 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"nico@...aro.org" <nico@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Will Deacon <Will.Deacon@....com>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 1/5] ARM: remove useless guard in smp.c

On Fri, Dec 21, 2012 at 10:02:01AM +0000, Santosh Shilimkar wrote:
> On Tuesday 18 December 2012 05:36 PM, Mark Rutland wrote:
> > Currently we only provide an implementation of smp_timer_broadcast in
> > smp.c if GENERIC_CLOCKEVENTS_BROADCAST is selected. As
> > smp_timer_broadcast is only used in smp.c, smp.c depends on SMP, and
> > GENERIC_CLOCKEVENTS_BROADCAST is selected by SMP, this is unnecessary.
> >
> > This patch removes the redundant guard.
> >
> > Signed-off-by: Mark Rutland <mark.rutland@....com>
> > ---
> CONFIG_GENERIC_CLOCKEVENTS_BROADCAST isn't mandatory to
> have SMP kernel working so the below select in ARM arch
> kconfig not seems to entirely accurate. SMP kernel will
> still boot with !GENERIC_CLOCKEVENTS_BROADCAST.
> 
> select GENERIC_CLOCKEVENTS_BROADCAST if SMP

Agreed, the selection is not entirely accurate. I'd be happy to see it made
more fine-grained (i.e. selected by platforms) instead.

If people want that I'm happy to drop this patch.

> The issue comes only for deeper CPU power C-states.
> Anyway, you patch is correct from the current code point of
> view.
> 
> Regards
> Santosh

Thanks,
Mark.

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