linux-kernel - Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588

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Message-ID: <20210803161434.GE32663@hoboy.vegasvil.org>
Date:   Tue, 3 Aug 2021 09:14:34 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Nicolas Pitre <nico@...xnic.net>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588_CLOCK
 dependencies

On Tue, Aug 03, 2021 at 08:55:56AM -0700, Richard Cochran wrote:
> On Tue, Aug 03, 2021 at 08:59:02AM +0200, Arnd Bergmann wrote:
> > It may well be a lost cause, but a build fix is not the time to nail down
> > that decision. The fix I proposed (with the added MAY_USE_PTP_1588_CLOCK
> > symbol) is only two extra lines and leaves everything else working for the
> > moment.
> 
> Well, then we'll have TWO ugly and incomprehensible Kconfig hacks,
> imply and MAY_USE.
> 
> Can't we fix this once and for all?
> 
> Seriously, "imply" has been nothing but a major PITA since day one,
> and all to save 22 kb.  I can't think of another subsystem which
> tolerates so much pain for so little gain.

Here is what I want to have, in accordance with the KISS principle:

config PTP_1588_CLOCK
	bool "PTP clock support"
	select NET
	select POSIX_TIMERS
	select PPS
	select NET_PTP_CLASSIFY

# driver variant 1:

config ACME_MAC
	select PTP_1588_CLOCK

# driver variant 2:

config ACME_MAC

config ACME_MAC_PTP
	depends on ACME_MAC
	select PTP_1588_CLOCK

Hm?	

Thanks,
Richard