linux-kernel - Re: [RFC][PATCH 3/3] Try to convert non-trivial clocksources to clocksource_register

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Date:	Mon, 10 May 2010 17:53:38 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	John Stultz <johnstul@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jim Cromie <jim.cromie@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 3/3] Try to convert non-trivial clocksources to
 clocksource_register_hz

On Fri, 30 Apr 2010 18:36:25 -0700
John Stultz <johnstul@...ibm.com> wrote:

> NOT FOR INCLUSION!
> NOT FOR INCLUSION!
> 
> I've already gone through and converted the rest of the clocksources 
> to use clocksource_register_hz, and I'll be hopefully pushing those 
> to arch maintainers for 2.6.36-2.6.37.
> 
> However, in going through all the clocksources, I hit a few
> non-trivial conversions and wanted to bring them up on the list
> early so they can be handled soon.
> 
> The following patch tries to convert the non-trival clocksources
> to use clocksource_register_hz/khz. It is likely broken. I will
> need arch maintainer help to figure out the best way to resovle 
> these clocksources.
> 
> This patch requires the previous "Add clocksource_register_hz/khz 
> interface" patch to build. 
> 
> So any help maintainers can provide in finding solutions to
> break the mult/shift assumptions in the arch code would be
> greatly appreciated!
> 
> thanks
> -john
> 
> NOT FOR INCLUSION!
> NOT FOR INCLUSION!

The s390 conversion to clocksource_register_khz looks good - at least
the kilo hertz value is correct. Bit 2^12 of the TOD value are
microseconds, which makes one millisecond (1000<<12). 

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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