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

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Date: Sat, 11 May 2024 11:59:59 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Mahesh Bandewar (महेश बंडेवार) <maheshb@...gle.com>
Cc: Richard Cochran <richardcochran@...il.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

On Fri, May 10 2024 at 09:45, Mahesh Bandewar (महेश बंडेवार) wrote:

> On Fri, May 10, 2024 at 12:50 AM Thomas Gleixner <tglx@...utronixde> wrote:
>>
>> On Thu, May 09 2024 at 21:07, Richard Cochran wrote:
>>
>> > 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).
>>
>> Adding the git SHA before committing the change is going to be
>> challenging :)
>
> Instead of v1/v2, how about I can make it 'prior to kernel 6.10' and
> 'from 6.10 onwards' etc. (as Richard proposed)?

Sure