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

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Date:   Thu, 23 Apr 2020 12:05:57 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Nicolas Pitre <nico@...xnic.net>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        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>,
        "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 Thu, Apr 23, 2020 at 11:01:40AM -0400, Nicolas Pitre wrote:
> On Wed, 22 Apr 2020, Randy Dunlap wrote:
> 
> > 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:
> > > 
> > > 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?
> 
> I don't see how that one can be helped. The MTD dependency is not 
> optional.

Could it be done as 

config MTD
   depends on CRAMFS if CRAMFS_MTD

?

Jason