linux-kernel - Re: [PATCH v6 8/9] Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping

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Message-ID: <20160113213156.GB20252@localhost.localdomain>
Date:	Wed, 13 Jan 2016 22:31:56 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	"Christopher S. Hall" <christopher.s.hall@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, john.stultz@...aro.org,
	hpa@...or.com, jeffrey.t.kirsher@...el.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, kevin.b.stanton@...el.com
Subject: Re: [PATCH v6 8/9] Add PTP_SYS_OFFSET_PRECISE for driver
 crosstimestamping

On Wed, Jan 13, 2016 at 04:12:28AM -0800, Christopher S. Hall wrote:
> Currently, network /system cross-timestamping is performed in the
> PTP_SYS_OFFSET ioctl. The PTP clock driver reads gettimeofday() and
> the gettime64() callback provided by the driver. The cross-timestamp
> is best effort where the latency between the capture of system time
> (getnstimeofday()) and the device time (driver callback) may be
> significant.

Looks good to me.

Acked-by: Richard Cochran <richardcochran@...il.com>