linux-kernel - Re: [RFC][PATCH] Convert alpha to use clocksource

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Message-ID: <20100322164137.GA12625@cmpxchg.org>
Date:	Mon, 22 Mar 2010 17:41:37 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	john stultz <johnstul@...ibm.com>,
	Richard Henderson <rth@...ddle.net>,
	lkml <linux-kernel@...r.kernel.org>,
	Matt Turner <mattst88@...il.com>
Subject: Re: [RFC][PATCH] Convert alpha to use clocksource

On Mon, Mar 22, 2010 at 03:22:12PM +0100, Thomas Gleixner wrote:
> On Mon, 22 Mar 2010, Johannes Weiner wrote:
> > > Though, even after a glance over the clocksource code, I've not
> > > gotten yet to how one could estimate the "shift" value...
> > > Any hints?
> > 
> > I had the same problem with xtensa and added a comment about what I
> > did in there, maybe it helps:
> > 
> > 	arch/xtensa/kernel/time.c
> > 
> > I took the upper bound of the multiplicator (nsecs per counter unit)
> > and subtracted its logarithm from my available 32 bits.  The result
> > is the highest possible shift value that works for the clocksource.
> 
> clocks_calc_mult_shift() is what you are looking for.

Oh, thanks!  That was not yet around at the time.

	Hannes

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