linux-kernel - Re: [PATCHv4 net-next] ptp/ioctl: support MONOTONIC_RAW timestamps for PTP_SYS_OFFSET

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Date: Thu, 9 May 2024 21:07:00 -0700
From: Richard Cochran <richardcochran@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Mahesh Bandewar <maheshb@...gle.com>, Netdev <netdev@...r.kernel.org>,
	Linux <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Arnd Bergmann <arnd@...db.de>, Sagi Maimon <maimon.sagi@...il.com>,
	Jonathan Corbet <corbet@....net>, John Stultz <jstultz@...gle.com>,
	Mahesh Bandewar <mahesh@...dewar.net>
Subject: Re: [PATCHv4 net-next] ptp/ioctl: support MONOTONIC_RAW timestamps
 for PTP_SYS_OFFSET_EXTENDED

Thomas,

On Wed, May 08, 2024 at 09:38:58AM +0200, Thomas Gleixner wrote:
> On Tue, May 07 2024 at 21:44, Richard Cochran wrote:
> > On Thu, May 02, 2024 at 02:10:47PM -0700, Mahesh Bandewar wrote:
> >> + * History:
> >> + * v1: Initial implementation.
> >> + *
> >> + * v2: Use the first word of the reserved-field for @clockid. That's
> >> + *     backward compatible since v1 expects all three reserved words
> >> + *     (@rsv[3]) to be 0 while the clockid (first word in v2) for
> >> + *     CLOCK_REALTIME is '0'.

..

> I agree that it wants to be in the commit message, but having the
> version information in the kernel-doc which describes the UAPI is
> sensible and useful. That's where I'd look first and asking a user to
> dig up this information on lore is not really helpful.

But writing "v1, v2" doesn't make sense for this code.  There never
was a "v1" for this ioctl.  At the very least, the change should be
identified by kernel version (or git SHA).

Thanks,
Richard