linux-kernel - Re: gtod/clocksource/clockevents documentation

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Message-Id: <200704221113.21778.david-b@pacbell.net>
Date:	Sun, 22 Apr 2007 11:13:21 -0700
From:	David Brownell <david-b@...bell.net>
To:	linux@...mer.net
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: gtod/clocksource/clockevents documentation

On Sunday 22 April 2007, Remy Bohmer wrote:
> Hello David,
> 
> Thanks for this patch you sent me. This patch will also increase the
> clock resolution which is good in RT context.

Yeah, a 32768 Hz timer (battery backed) may leave a bit to be desired.

> But, unfortunately, I have some problems with compiling the kernel, as
> this patch does not enable CONFIG_GENERIC_TIME, while the patch you
> published earlier did.

I'm not sure which patch you mean.  I tested only in conjunction with
updates specific to the at91rm9200.

> Is there a special reason why you removed that?

My config didn't need it ... and ISTR that making a system support
it was more than just adding a "select GENERIC_TIME" after

> > +config AT91_TC_CLOCKSOURCE

Like the various arch/arm/kernel/* changes needed.  ISTR
there are several still in Russell's patch queue.

But basically, because I couldn't test such an at91sam926x
configuration.  That would be one of the "tweaks" that I
mentioned you would need to do.

- Dave

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