linux-kernel - Re: [PATCH 1/2] pcmcia : make PCMCIA depend on HAS

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Date:   Thu, 16 Feb 2023 10:05:15 +0100
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-s390@...r.kernel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: [PATCH 1/2] pcmcia : make PCMCIA depend on HAS_IOMEM

On Thu, 2023-02-16 at 15:34 +0800, Baoquan He wrote:
> On s390 systems (aka mainframes), it has classic channel devices for
> networking and permanent storage that are currently even more common
> than PCI devices. Hence it could have a fully functional s390 kernel
> with CONFIG_PCI=n, then the relevant iomem mapping functions
> [including ioremap(), devm_ioremap(), etc.] are not available.
> 
> Here let depend PCMCIA on HAS_IOMEM so that it won't be built to
> cause below compiling error if PCI is unset.
> 
> -------------------------------------------------------
> ld: drivers/pcmcia/cistpl.o: in function `set_cis_map':
> cistpl.c:(.text+0x1202): undefined reference to `ioremap'
> ld: cistpl.c:(.text+0x13b0): undefined reference to `iounmap'
> ld: cistpl.c:(.text+0x14a6): undefined reference to `iounmap'
> ld: cistpl.c:(.text+0x1544): undefined reference to `ioremap'
> ld: drivers/pcmcia/cistpl.o: in function `release_cis_mem':
> cistpl.c:(.text+0x3f14): undefined reference to `iounmap'
> 
> Link: https://lore.kernel.org/all/Y0TcaZD4nB1w+mAQ@MiWiFi-R3L-srv/T/#u
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Cc: Dominik Brodowski <linux@...inikbrodowski.net>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> ---
>  drivers/pcmcia/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
> index 1525023e49b6..7c412bbe8bbe 100644
> --- a/drivers/pcmcia/Kconfig
> +++ b/drivers/pcmcia/Kconfig
> @@ -20,6 +20,7 @@ if PCCARD
>  
>  config PCMCIA
>  	tristate "16-bit PCMCIA support"
> +	depends on HAS_IOMEM
>  	select CRC32
>  	default y
>  	help

Not sure how many PCMCIA drivers only use I/O memory but not I/O ports
the latter of which are badly stubbed out on s390, though at leat they
compile. I have a series on that part that I intend to send a new
version for soon™. That said yes this does solve the compilation issue
and there could be drivers which rely only on I/O memory and are not
broken in principle.

Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>