On Thu, 01 Feb 2007 10:59:53 +0100 [email protected] wrote:
> Fix a race in the initialization of HPET, which might result in a
> 5 minute lockup on boot.
>
What race? Please always describe bugs when fixing them.
>
> Index: linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
> ===================================================================
> --- linux-2.6.20-rc5.orig/arch/x86_64/kernel/apic.c
> +++ linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
> @@ -764,10 +767,12 @@ static void setup_APIC_timer(unsigned in
>
> /* wait for irq slice */
> if (vxtime.hpet_address && hpet_use_timer) {
> - int trigger = hpet_readl(HPET_T0_CMP);
> - while (hpet_readl(HPET_COUNTER) >= trigger)
> - /* do nothing */ ;
> - while (hpet_readl(HPET_COUNTER) < trigger)
> + int trigger;
> + do
> + trigger = hpet_readl(HPET_T0_CMP);
> + while (hpet_readl(HPET_COUNTER) >= trigger);
> +
Is this signedness-safe and wraparound-safe? It might be better to make
`trigger' unsigned and do
while (hpet_readl(HPET_COUNTER) - trigger >= 0)
> + while (hpet_readl(HPET_COUNTER) < trigger)
> /* do nothing */ ;
ditto.
-
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