linux-kernel - Re: [RFC PATCH 1/2] Kconfig: Introduce "uses" keyword

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Date:   Wed, 22 Apr 2020 15:37:46 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Nicolas Pitre <nico@...xnic.net>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "masahiroy@...nel.org" <masahiroy@...nel.org>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>,
        "arnd@...db.de" <arnd@...db.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "kieran.bingham+renesas@...asonboard.com" 
        <kieran.bingham+renesas@...asonboard.com>,
        "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "leon@...nel.org" <leon@...nel.org>
Subject: Re: [RFC PATCH 1/2] Kconfig: Introduce "uses" keyword

On 4/22/20 2:13 PM, Nicolas Pitre wrote:
> On Wed, 22 Apr 2020, Jani Nikula wrote:
> 
>> On Tue, 21 Apr 2020, Nicolas Pitre <nico@...xnic.net> wrote:
>>> This is really a conditional dependency. That's all this is about.
>>> So why not simply making it so rather than fooling ourselves? All that 
>>> is required is an extension that would allow:
>>>
>>> 	depends on (expression) if (expression)
>>>
>>> This construct should be obvious even without reading the doc, is 
>>> already used extensively for other things already, and is flexible 
>>> enough to cover all sort of cases in addition to this particular one.
>>
>> Okay, you convinced me. Now you only need to convince whoever is doing
>> the actual work of implementing this stuff. ;)
> 
> What about this:
> 
> ----- >8
> Subject: [PATCH] kconfig: allow for conditional dependencies
> 
> This might appear to be a strange concept, but sometimes we want
> a dependency to be conditionally applied. One such case is currently
> expressed with:
> 
> 	depends on FOO || !FOO
> 
> This pattern is strange enough to give one's pause. Given that it is
> also frequent, let's make the intent more obvious with some syntaxic 
> sugar by effectively making dependencies optionally conditional.
> This also makes the kconfig language more uniform.
> 
> Signed-off-by: Nicolas Pitre <nico@...xnic.net>

Hi,

If we must do something here, I prefer this one.

Nicolas, would you do another example, specifically for
CRAMFS_MTD in fs/cramfs/Kconfig, please?

thanks.
-- 
~Randy