[PATCH 2.4] fix for clock running too fast

[Akira Tsukamoto <akira-t@s9.dion.ne.jp>]

Ingo Molnar <mingo@elte.hu> mentioned:
> 
> * Akira Tsukamoto <akira-t@s9.dion.ne.jp> wrote:
> 
> > This one line patch adds upper bound testing inside timer_irq_works() 
> > when evaluating whether irq timer works or not on boot up.
> > 
> > It fix the machines having problem with clock running too fast.
> > 
> > What this patch do is, if  timer interrupts running too fast through 
> > IO-APIC IRQ then false back to i8259A IRQ.
> 
> thanks - looks good to me.
> 
> Acked-by: Ingo Molnar <mingo@elte.hu>
> 
> 	Ingo

This patch is against kernel 2.4.

Signed-off-by: Akira Tsukamoto <akira-t@s9.dion.ne.jp>

--- linux-2.4.32-atifix/arch/i386/kernel/io_apic.c.orig	2004-11-17 20:54:21.000000000 +0900
+++ linux-2.4.32-atifix/arch/i386/kernel/io_apic.c	2005-11-25 02:27:32.000000000 +0900
@@ -1194,7 +1194,7 @@ static int __init timer_irq_works(void)
 	 * might have cached one ExtINT interrupt.  Finally, at
 	 * least one tick may be lost due to delays.
 	 */
-	if (jiffies - t1 > 4)
+	if (jiffies - t1 > 4 && jiffies - t1 < 16)
 		return 1;
 
 	return 0;



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-- 
Akira Tsukamoto <akira-t@s9.dion.ne.jp> <>


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