linux-kernel - Re: [PATCH v3) posix-timers: make it configurable

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Message-ID: <alpine.LFD.2.20.1609151722080.9883@knanqh.ubzr>
Date:   Thu, 15 Sep 2016 17:35:28 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Josh Triplett <josh@...htriplett.org>
cc:     Richard Cochran <richardcochran@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3) posix-timers: make it configurable

On Thu, 15 Sep 2016, Josh Triplett wrote:

> On Thu, Sep 15, 2016 at 11:07:24PM +0200, Richard Cochran wrote:
> > On Thu, Sep 15, 2016 at 12:58:22PM -0700, John Stultz wrote:
> > > This doesn't look too bad.
> > 
> > I disagree.  It looks ugly.  If tinification means sprinkling more and
> > more of these conditionals all over the place, then it is going to be
> > a tough sell.
> 
> Looking at this particular patch, it does seem a bit much for the
> ability to have PTP without timers.  That doesn't seem like a very
> likely combination.  Handling that in Kconfig seems fine, unless there's
> a concrete use case for that combination.

I doubt there is.  This is more for randconfig purposes or the like.

I suspect there is more of a case for having net drivers _without_ ptp 
support.  This could be implemented with a ptp_clock_register() stub 
returning NULL when ptp is not configured.  I didn't look at most 
drivers but at least broadcom/tg3.c seems to be fine with such an 
approach.

Alternatively, all those ethernet drivers currently selecting 
PTP_1588_CLOCK could be banned from the kernel config when POSIX_TIMERS 
is not selected.

What do people prefer?

Nicolas