linux-kernel - RE: [PATCH V4 3/4] ARM: Xilinx: base header files and assembly macros

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Date:	Mon, 21 Feb 2011 07:36:56 -0700
From:	John Linn <John.Linn@...inx.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux@....linux.org.uk>,
	<catalin.marinas@....com>, <glikely@...retlab.ca>,
	<jamie@...ieiles.com>
Subject: RE: [PATCH V4 3/4] ARM: Xilinx: base header files and assembly macros

> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Monday, February 21, 2011 1:37 AM
> To: John Linn
> Cc: linux-arm-kernel@...ts.infradead.org;
linux-kernel@...r.kernel.org;
> linux@....linux.org.uk; catalin.marinas@....com; glikely@...retlab.ca;
> jamie@...ieiles.com
> Subject: Re: [PATCH V4 3/4] ARM: Xilinx: base header files and
assembly
> macros
> 
> On Monday 21 February 2011, John Linn wrote:
> > > > diff --git a/arch/arm/mach-xilinx/include/mach/timex.h
> > > b/arch/arm/mach-xilinx/include/mach/timex.h
> > > > new file mode 100644
> > > > index 0000000..4ebc0a6
> > > > --- /dev/null
> > > > +++ b/arch/arm/mach-xilinx/include/mach/timex.h
> > > > +#ifndef __MACH_TIMEX_H__
> > > > +#define __MACH_TIMEX_H__
> > > > +
> > > > +#define PERIPHERAL_CLOCK_RATE  2500000
> > > > +
> > > > +#define CLOCK_TICK_RATE        (PERIPHERAL_CLOCK_RATE / 32)
> > > > +
> > > > +#endif
> > >
> > > I thought we were at the point where CLOCK_TICK_RATE is no longer
> > used.
> >
> > The timer code in these patches is using it, no other comments on it
> so
> > far.
> >
> > > Did the patches not make it in yet?
> > >
> >
> > I haven't heard they made them in yet, just waiting and hoping for
an
> > ack.
> 
> I meant the patches removing CLOCK_TICK_RATE from common code, not
your
> patches, sorry for being vague.

Ahh... understand.  No problem, wishful thinking on my part :)

> 
> It would be better if you could avoid introducing new uses of
> CLOCK_TICK_RATE, because that will have to be removed before we can
> move to a real multi-platform kernel. For instance, you can put
> PERIPHERAL_CLOCK_RATE in a hardware specific header and put a bogus
> definition for CLOCK_TICK_RATE into timex.h

Hi Arnd,

I can remove the use of it from my timer code, but I still see
CLOCK_TICK_RATE 
being used in linux/jiffies.h.

I tried removing it and got build errors.  Am I missing something there?

Thanks,
John

> 
> 	Arnd


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