linux-kernel - Re: [PATCH v7] posix-timers: add clock

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Date: Tue, 2 Apr 2024 14:16:30 -0700
From: Mahesh Bandewar (महेश बंडेवार) <maheshb@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Sagi Maimon <maimon.sagi@...il.com>, richardcochran@...il.com, luto@...nel.org, 
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, 
	hpa@...or.com, arnd@...db.de, geert@...ux-m68k.org, peterz@...radead.org, 
	hannes@...xchg.org, sohil.mehta@...el.com, rick.p.edgecombe@...el.com, 
	nphamcs@...il.com, palmer@...ive.com, keescook@...omium.org, 
	legion@...nel.org, mark.rutland@....com, mszeredi@...hat.com, 
	casey@...aufler-ca.com, reibax@...il.com, davem@...emloft.net, 
	brauner@...nel.org, linux-kernel@...r.kernel.org, linux-api@...r.kernel.org, 
	linux-arch@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v7] posix-timers: add clock_compare system call

On Tue, Apr 2, 2024 at 2:25 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Mon, Apr 01 2024 at 22:42, Mahesh Bandewar (महेश बंडेवार) wrote:
> > On Mon, Apr 1, 2024 at 1:46 PM Thomas Gleixner <tglx@...utronixde> wrote:
> >> So if there is a backwards compability issue with PTP_SYS_OFFSET2, then
> >> you need to introduce PTP_SYS_OFFSET3. The PTP_SYS_*2 variants were
> >> introduced to avoid backwards compatibility issues as well, but
> >> unfortunately that did not address the reserved fields problem for
> >> PTP_SYS_OFFSET2. PTP_SYS_OFFSET_EXTENDED2 should just work, but maybe
> >> the PTP maintainers want a full extension to '3'. Either way is fine.
> >>
> > https://patchwork.kernel.org/project/netdevbpf/patch/20240104212436.3276057-1-maheshb@google.com/
> >
> > This was my attempt to solve a similar issue with the new ioctl op to
> > avoid backward compatibility issues.  Instead of flags I used the
> > clockid_t in a similar fashion.
>
> Works as well. I'm not seing the point for CLOCK_MONOTONIC and the
> change logs are not really telling anything about the problem being
> solved....
>
https://lore.kernel.org/lkml/20240104212431.3275688-1-maheshb@google.com/T/#:~:text=*%20[PATCHv3%20net%2Dnext%200/3]%20add%20ptp_gettimex64any()%20API,21:24%20Mahesh%20Bandewar%200%20siblings%2C%200%20replies;

This is the cover letter where I tried to explain the need for this.

Granted, my current use case is for CLOCK_MONOTONIC_RAW but just
because I don't have a use case doesn't mean someone else may not have
it and hence added it. In either way it's just a matter of
adding/removing another flag/clock-id.

Thanks,
--mahesh..
> Thanks,
>
>         tglx