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

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Date:	Wed, 2 Apr 2008 13:20:07 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	john stultz <johnstul@...ibm.com>
cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] Keep track of original clocksource frequency

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.

bye, Roman


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

---
 include/linux/clocksource.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/include/linux/clocksource.h
===================================================================
--- linux-2.6.orig/include/linux/clocksource.h
+++ linux-2.6/include/linux/clocksource.h
@@ -64,7 +64,7 @@ struct clocksource {
 	cycle_t (*read)(void);
 	cycle_t mask;
 	u32 mult;
-	s32 mult_orig;
+	u32 mult_orig;
 	u32 shift;
 	unsigned long flags;
 	cycle_t (*vread)(void);
--
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