* Yang, Sheng <[EMAIL PROTECTED]> wrote:
> +#if 1
> +#define pit_debug(fmt, arg...) printk(KERN_WARNING fmt, ##arg)
> +#else
> +#define pit_debug(fmt, arg...)
> +#endif
this should use pr_debug() instead i guess.
> +#ifndef CONFIG_X86_64
> +#define mod_64(x, y) ((x) - (y) * div64_64(x, y))
> +#else
> +#define mod_64(x, y) ((x) % (y))
> +#endif
> +/* Compute with 96 bit intermediate result: (a*b)/c */
> +static u64 muldiv64(u64 a, u32 b, u32 c)
> +{
> + union {
> + u64 ll;
> + struct {
> + u32 low, high;
> + } l;
> + } u, res;
> + u64 rl, rh;
> +
> + u.ll = a;
> + rl = (u64)u.l.low * (u64)b;
> + rh = (u64)u.l.high * (u64)b;
> + rh += (rl >> 32);
> + res.l.high = div64_64(rh, c);
> + res.l.low = div64_64(((mod_64(rh, c) << 32) + (rl & 0xffffffff)), c);
> + return res.ll;
> +}
eventually these should move into a generic file, for example
lib/div64.c.
> + ASSERT(mutex_is_locked(&kvm->arch.vpit->pit_state.lock));
could we please standardize on WARN_ON(!(x)) instead?
> +static enum hrtimer_restart pit_timer_fn(struct hrtimer *data)
> +{
> + struct kvm_kpit_state *ps;
> + int restart_timer = 0;
> +
> + ps = container_of(data, struct kvm_kpit_state, pit_timer.timer);
> +
> + restart_timer = __pit_timer_fn(ps);
> +
> + if (restart_timer)
> + return HRTIMER_RESTART;
> + else
> + return HRTIMER_NORESTART;
> +}
elegant use of hrtimers! :-)
> + if (val == 0)
> + val = 0x10000;
magic constant.
> + val &= 0xff;
> + addr &= 3;
magic constants.
Ingo
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