linux-kernel - Re: [PATCH v2] parport_pc: Also enable driver for PCI systems

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Date:   Wed, 16 Feb 2022 18:17:44 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-csky@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-um <linux-um@...ts.infradead.org>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] parport_pc: Also enable driver for PCI systems

On Wed, Feb 16, 2022 at 5:35 PM Maciej W. Rozycki <macro@...am.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