linux-kernel - Re: [PATCH 1/2] Keep track of original clocksource frequency

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Date:	Wed, 02 Apr 2008 08:38:37 -0700
From:	John Stultz <johnstul@...ibm.com>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] Keep track of original clocksource frequency


On Wed, 2008-04-02 at 13:20 +0200, Roman Zippel wrote:
> Hi,
> 
> On Tue, 18 Mar 2008, john stultz wrote:
> 
> > @@ -63,6 +64,7 @@ struct clocksource {
> >  	cycle_t (*read)(void);
> >  	cycle_t mask;
> >  	u32 mult;
> > +	s32 mult_orig;
> >  	u32 shift;
> >  	unsigned long flags;
> >  	cycle_t (*vread)(void);
> 
> This is wrong, with HZ=100 the jiffies clock multiplier suddenly becomes 
> negative and later the raw interval underflows.

Ah, thanks for catching that!

> 
> Signed-off-by: Roman Zippel <zippel@...ux-m68k.org>

Acked-by: John Stultz <johnstul@...ibm.com>



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