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From: Arnd Bergmann <arnd@kernel.org>
To: "Keller, Jacob E" <jacob.e.keller@intel.com>
Cc: Richard Cochran <richardcochran@gmail.com>,
	Nicolas Pitre <nicolas.pitre@linaro.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
	"Nguyen, Anthony L" <anthony.l.nguyen@intel.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Kurt Kanzenbach <kurt@linutronix.de>,
	"Saleem, Shiraz" <shiraz.saleem@intel.com>,
	"Ertman, David M" <david.m.ertman@intel.com>,
	"intel-wired-lan@lists.osuosl.org"
	<intel-wired-lan@lists.osuosl.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next v2] ethernet/intel: fix PTP_1588_CLOCK dependencies
Date: Mon, 2 Aug 2021 22:32:08 +0200	[thread overview]
Message-ID: <CAK8P3a3P6=ZROxT8daW83mRp7z5rYAQydetWFXQoYF7Y5_KLHA@mail.gmail.com> (raw)
In-Reply-To: <bd631e36-1701-b120-a9b0-8825d14cc694@intel.com>

On Mon, Aug 2, 2021 at 9:54 PM Keller, Jacob E <jacob.e.keller@intel.com> wrote:
>
> So go back to "select"?
>
> It looks like Arnd proposed in the thread a solution that did a sort of
> "please enable this" but still let you disable it.
>
> An alternative (unfortunately per-driver...) solution was to setup the
> drivers so that they gracefully fall back to disabling PTP if the PTP
> core support is not reachable.. but that obviously requires that drivers
> do the right thing, and at least Intel drivers have not tested this
> properly.
>
> I'm definitely in favor of removing "implies" entirely. The semantics
> are unclear, and the fact that it doesn't handle the case of "i'm
> builtin, so my implies can't be modules"...
>
> I don't really like the syntax of the double "depends on A || !A".. I'd
> prefer if we had some keyword for this, since it would be more obvious
> and not run against the standard logic (A || !A is a tautology!)

I think the main reason we don't have a keyword for it is that nobody
so far has come up with an English word that expresses what it is
supposed to mean.

You can do something like it for a particular symbol though, such as

config MAY_USE_PTP_1588_CLOCK
       def_tristate PTP_1588_CLOCK || !PTP_1588_CLOCK

 config E1000E
        tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
        depends on PCI && (!SPARC32 || BROKEN)
+       depends on MAY_USE_PTP_1588_CLOCK
        select CRC32
-       imply PTP_1588_CLOCK


          Arnd

  reply	other threads:[~2021-08-02 20:32 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 14:59 Arnd Bergmann
2021-08-02 16:49 ` Richard Cochran
2021-08-02 19:54   ` Keller, Jacob E
2021-08-02 20:32     ` Arnd Bergmann [this message]
2021-08-02 20:46       ` Keller, Jacob E
2021-08-02 20:59         ` Arnd Bergmann
2021-08-02 21:09           ` Keller, Jacob E
2021-08-02 21:10           ` Keller, Jacob E
2021-08-02 21:22           ` Nicolas Pitre
2021-08-03 20:29       ` Arnd Bergmann
2021-08-02 23:09     ` Richard Cochran
2021-08-02 23:45       ` Keller, Jacob E
2021-08-03  0:03         ` Richard Cochran
2021-08-03  6:59       ` Arnd Bergmann
2021-08-03 15:55         ` Richard Cochran
2021-08-03 16:14           ` Richard Cochran
2021-08-03 17:00             ` Arnd Bergmann
2021-08-03 17:18               ` Keller, Jacob E
2021-08-03 18:27                 ` Arnd Bergmann
2021-08-03 23:25                   ` Keller, Jacob E
2021-08-04 11:18                   ` Arnd Bergmann
2021-08-03 20:54               ` Richard Cochran
2021-08-04 20:53                 ` Keller, Jacob E

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