linux-kernel - Re: [PATCH v3 01/10] Add auxiliary bus support

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Message-ID: <CAPcyv4hmBhkFjSA2Q_p=Ss40CLFs86N7FugJOpq=sZ-NigoSRw@mail.gmail.com>
Date:   Thu, 5 Nov 2020 09:12:51 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Leon Romanovsky <leonro@...dia.com>
Cc:     Dave Ertman <david.m.ertman@...el.com>,
        alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
        Mark Brown <broonie@...nel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Doug Ledford <dledford@...hat.com>,
        Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Fred Oh <fred.oh@...ux.intel.com>,
        Parav Pandit <parav@...lanox.com>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "Patil, Kiran" <kiran.patil@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 01/10] Add auxiliary bus support

On Thu, Nov 5, 2020 at 1:47 AM Leon Romanovsky <leonro@...dia.com> wrote:
>
> On Thu, Nov 05, 2020 at 01:19:09AM -0800, Dan Williams wrote:
> > Some doc fixups, and minor code feedback. Otherwise looks good to me.
> >
> > On Thu, Oct 22, 2020 at 5:35 PM Dave Ertman <david.m.ertman@...el.com> wrote:
> > >
>
> <...>
>
> > >
> > > +config AUXILIARY_BUS
> > > +       bool
> >
> > tristate? Unless you need non-exported symbols, might as well let this
> > be a module.
>
> I asked it to be "bool", because bus as a module is an invitation for
> a disaster. For example if I compile-in mlx5 which is based on this bus,
> and won't add auxiliary_bus as a module to initramfs, the system won't boot.

Something is broken if module dependencies don't arrange for
auxiliary_bus.ko to be added to the initramfs automatically, but yes,
it is another degree of freedom for something to go wrong if you build
the initramfs by hand.

>
> <...>
>
> >
> > Per above SPDX is v2 only, so...
>
> Isn't it default for the Linux kernel?

SPDX eliminated the need to guess a default, and MODULE_LICENSE("GPL")
implies the "or later" language. The only default assumption is that
the license is GPL v2 compatible, those possibilities are myriad, but
v2-only is the first preference.