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SubjectRe: [PATCH] linux-2.5.54_delay-cleanup_A0
Hi!

> Linus, all,
> I've been busy with other things, so I've just been sitting on this for
> a while. Anyway, I figured it was about time to resend.
>
> This patch tries to cleanup the delay code by moving the timer-specific
> implementations into the timer_ops struct. Thus, rather then doing:
>
> if(x86_delay_tsc)
> __rdtsc_delay(loops);
> else if(x86_delay_cyclone)
> __cyclone_delay(loops);
> else if(whatever....
>
> we just simply do:
>
> if(timer)
> timer->delay(loops);
>
> diff -Nru a/arch/i386/kernel/timers/timer_pit.c b/arch/i386/kernel/timers/timer_pit.c
> --- a/arch/i386/kernel/timers/timer_pit.c Tue Jan 7 17:11:03 2003
> +++ b/arch/i386/kernel/timers/timer_pit.c Tue Jan 7 17:11:03 2003
> @@ -27,6 +27,19 @@
> /* nothing needed */
> }
>
> +static void delay_pit(unsigned long loops)
> +{
> + int d0;
> + __asm__ __volatile__(
> + "\tjmp 1f\n"
> + ".align 16\n"
> + "1:\tjmp 2f\n"
> + ".align 16\n"
> + "2:\tdecl %0\n\tjns 2b"
> + :"=&a" (d0)
> + :"0" (loops));
> +}
> +

But... this is not using pit to do the delay, right? It is sensitive
to CPU clock changes, pit-delay should not be.

Pavel

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