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

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Message-ID: <CAK8P3a0ydfp79Us-WhwwHOB2MGgtj=ovfYa_g8qhazA4gmv8eg@mail.gmail.com>
Date:   Thu, 23 Apr 2020 17:28:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Nicolas Pitre <nico@...xnic.net>,
        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>,
        "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 5:16 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
> On Thu, Apr 23, 2020 at 11:11:46AM -0400, Nicolas Pitre wrote:

> > > > 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
> > >
> > > ?
> >
> > No. There is no logic in restricting MTD usage based on CRAMFS or
> > CRAMFS_MTD.
>
> Ah, I got it backwards, maybe this:
>
> config CRAMFS
>    depends on MTD if CRAMFS_MTD

I'm not sure this can work if you also have the requirement that 'CRAMFS_MTD
depends on CRAMFS': dependencies in Kconfig generally cannot have
loops in them.

       Arnd