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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Wed, 16 Feb 2022 18:17:44 +0100
Message-ID: <CAK8P3a3F4x6XX9oZG+6L6NDYOMWv5O-vr2dN6=VF0SLGJzPMLQ@mail.gmail.com>
Subject: Re: [PATCH v2] parport_pc: Also enable driver for PCI systems
To:     "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
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        Vasily Gorbik <gor@linux.ibm.com>,
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        Sven Schnelle <svens@linux.ibm.com>,
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        Richard Weinberger <richard@nod.at>,
        Anton Ivanov <anton.ivanov@cambridgegreys.com>,
        Chris Zankel <chris@zankel.net>,
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On Wed, Feb 16, 2022 at 5:35 PM Maciej W. Rozycki <macro@orcam.me.uk> wrote:
>
> On Wed, 16 Feb 2022, Christoph Hellwig wrote:
>
> > > > Instead of adding generic-y just ad a mandatory-y in
> > > > include/asm-generic/Kbuild.
> > >
> > >  I'm inconvinced.  Not all archs want it, 5 don't.
> >
> > Which is exactly what mandatory-y is for.  Provide the asm-generic
> > version by default, but let architectures override it.
>
>  I don't think so.  Those 5 architectures don't want it at all; 7 other
> ones have their own versions.
>
>  Otherwise we could blanket-list all asm-generic headers as mandatory-y.

I think ideally the PCI driver should be a separate file from the rest, or
possibly it could get split up even further.

parport_pc_probe_port()/parport_pc_unregister_port() are already exported
by the driver and used by some of the front-ends. The parport_pc_pci_driver
looks like it could easily go into one file using module_pci_driver(), while
the platform driver stays in the existing file and the legacy detection logic
goes into a third one. The powerpc and sparc versions could technically
also be separate drivers, but I wouldn't take the rework that far.

       Arnd