Re: [PATCH 2/2] hyperv: Implement Time Synchronization using host time sample

From: Dan Carpenter
Date: Tue Oct 14 2014 - 07:20:04 EST


I had a couple small style nits.

On Tue, Oct 14, 2014 at 04:11:18AM -0700, Thomas Shao wrote:
> diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
> index 3b9c9ef..1d8390c 100644
> --- a/drivers/hv/hv_util.c
> +++ b/drivers/hv/hv_util.c
> @@ -51,11 +51,30 @@
> #define HB_WS2008_MAJOR 1
> #define HB_WS2008_VERSION (HB_WS2008_MAJOR << 16 | HB_MINOR)
>
> +#define TIMESAMPLE_INTERVAL 5000000000L /* 5s in nanosecond */

If you wanted you could say:

#define TIMESAMPLE_INTERVAL (5 * NSEC_PER_SEC)

> +
> +/*host sends time sample for every 5s.So the max polling interval
> + *is 128*5 = 640s.
> +*/

The comment still has problems throughout. Read
Documentation/CodingStyle.

> +#define TIME_ADJ_MAX_INTERVAL 128 /*Max polling interval */
> +
> static int sd_srv_version;
> static int ts_srv_version;
> static int hb_srv_version;
> static int util_fw_version;
>
> +/*host sends time sample for every 5s.So the initial polling interval
> + *is 5s.
> +*/
> +static s32 adj_interval = 1;

Prefer mundane types instead there is a reason. This should be int
because it's not specified in a hardware spec. I know you are being
consistent with the surrounding code, but the surrounding code is bad so
don't emulate it.

> +
> +/*The host_time_sync module parameter is used to control the time
> + sync between host and guest.
> +*/
> +static bool host_time_sync;
> +module_param(host_time_sync, bool, (S_IRUGO | S_IWUSR));
> +MODULE_PARM_DESC(host_time_sync, "If the guest sync time with host");

Maybe say: "Synchronize time with the host"?

> +
> static void shutdown_onchannelcallback(void *context);
> static struct hv_util_service util_shutdown = {
> .util_cb = shutdown_onchannelcallback,
> @@ -163,15 +182,61 @@ static void shutdown_onchannelcallback(void *context)
> /*
> * Set guest time to host UTC time.
> */
> -static inline void do_adj_guesttime(u64 hosttime)
> +static inline void do_adj_guesttime(u64 hosttime, bool forceSync)

I'm surprise checkpatch.pl does't complain about this CamelCase.

regards,
dan carpenter

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