On Mon, 2010-05-10 at 18:12 +0000, Haiyang Zhang wrote:
> diff --git a/drivers/staging/hv/hv_utils.c b/drivers/staging/hv/hv_utils.c
> index 8f1d3ba..c0f57a1 100644
> --- a/drivers/staging/hv/hv_utils.c
> +++ b/drivers/staging/hv/hv_utils.c
> @@ -106,28 +106,45 @@ static void shutdown_onchannelcallback(void *context)
> orderly_poweroff(false);
> }
>
> -
> /*
> - * Synchronize time with host after reboot, restore, etc.
> + * Set guest time to host UTC time.
> */
> -static void adj_guesttime(u64 hosttime, u8 flags)
> +static inline void do_adj_guesttime(u64 hosttime)
> {
> s64 host_tns;
> struct timespec host_ts;
> - static s32 scnt = 50;
>
> host_tns = (hosttime - WLTIMEDELTA) * 100;
> host_ts = ns_to_timespec(host_tns);
>
> + do_settimeofday(&host_ts);
> +
> + return;
> +}
Just a couple of style nits.
return at the end of a void function() is unnecessary.
> +
> +/*
> + * Synchronize time with host after reboot, restore, etc.
> + *
> + * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
> + * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
> + * message after the timesync channel is opened. Since the hv_utils module is
> + * loaded after hv_vmbus, the first message is usually missed. The other
> + * thing is, systime is automatically set to emulated hardware clock which may
> + * not be UTC time or in the same time zone. So, to override these effects, we
> + * use the first 50 time samples for initial system time setting.
> + */
> +static inline void adj_guesttime(u64 hosttime, u8 flags)
> +{
> + static s32 scnt = 50;
> +
> if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
> - do_settimeofday(&host_ts);
> + do_adj_guesttime(hosttime);
> return;
> }
>
> - if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 &&
> - scnt > 0) {
> + if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
> scnt--;
> - do_settimeofday(&host_ts);
> + do_adj_guesttime(hosttime);
> }
>
> return;
here too
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