linux-kernel - Re: [PATCH v3 21/38] parport: PC style parport depends on HAS

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Date:   Tue, 14 Mar 2023 15:12:27 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Niklas Schnelle" <schnelle@...ux.ibm.com>,
        "Sudip Mukherjee" <sudipm.mukherjee@...il.com>
Cc:     "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Alan Stern" <stern@...land.harvard.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Albert Ou" <aou@...s.berkeley.edu>, linux-kernel@...r.kernel.org,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-pci@...r.kernel.org, "Arnd Bergmann" <arnd@...nel.org>
Subject: Re: [PATCH v3 21/38] parport: PC style parport depends on HAS_IOPORT

On Tue, Mar 14, 2023, at 13:11, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. As PC style parport uses these functions we need to
> handle this dependency.
>
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>

> 
>  menuconfig PARPORT
>  	tristate "Parallel port support"
> -	depends on HAS_IOMEM

I would leave this dependency, or maybe make it 'HAS_IOMEM || HAS_IOPORT'.
at least the parport_atari driver uses MMIO instead of PIO.

>  	help
>  	  If you want to use devices connected to your machine's parallel port
>  	  (the connector at the computer with 25 holes), e.g. printer, ZIP
> @@ -42,7 +41,8 @@ if PARPORT
> 
>  config PARPORT_PC
>  	tristate "PC-style hardware"
> -	depends on ARCH_MIGHT_HAVE_PC_PARPORT || (PCI && !S390)
> +	depends on ARCH_MIGHT_HAVE_PC_PARPORT
> +	depends on HAS_IOPORT
>  	help
>  	  You should say Y here if you have a PC-style parallel port. All
>  	  IBM PC compatible computers and some Alphas have PC-style

This would revert 66bcd06099bb ("parport_pc: Also enable driver for
PCI systems"), so I think this is wrong. You can drop the !S390
by adding HAS_IOPORT as a dependency, but the other line should still
be 

       depends on ARCH_MIGHT_HAVE_PC_PARPORT || PCI
    

    Arnd