linux-kernel - Re: [PATCH 1/2] arch: arm: Correct the dependency of HAVE_ARM

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Message-ID: <20110712073401.GB23270@n2100.arm.linux.org.uk>
Date:	Tue, 12 Jul 2011 08:34:01 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	林宏文 <tommy.lin.1101@...il.com>
Cc:	Anton Vorontsov <cbouatmailru@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arch: arm: Correct the dependency of HAVE_ARM_TWD

On Tue, Jul 12, 2011 at 02:57:38PM +0800, 林宏文 wrote:
> 2011/7/8 Russell King - ARM Linux <linux@....linux.org.uk>
> >
> > On Fri, Jul 08, 2011 at 01:10:14PM +0400, Anton Vorontsov wrote:
> > > On Fri, Jul 08, 2011 at 01:59:23PM +0800, Tommy Lin wrote:
> > > Russell,
> > >
> > > As the patch is needed for CNS3xxx Watchdog support, I'd like to take
> > > it via CNS3xxx tree, if you're OK with that.
> >
> > No.
> >
> > TWD is only useful if SMP is enabled, otherwise the contained code
> > won't be called.  Without SMP you'll find that the timer rate will
> > be zero.
> >
> > So actually your problems are bigger than just this dependency.
>
> I think LOCAL_TIMERS is the one that useful if SMP is enabled. The zero
> timer rate issue still able to limited by LOCAL_TIMERS.

No.  I could repeat everything I've said about the initialization but
there's no point.  I'm not dropping the SMP dependency of SMP_TWD.
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