linux-kernel - Re: [PATCH] asm-generic: Support NO_IOPORT_MAP in pci

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Date:   Fri, 29 Jul 2022 12:04:49 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Stafford Horne <shorne@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH] asm-generic: Support NO_IOPORT_MAP in pci_iomap.h

On Sat, Jul 23, 2022 at 06:22:48AM +0900, Stafford Horne wrote:
> When building OpenRISC PCI which has no ioport_map we get the following build
> error.
> 
>     lib/pci_iomap.c: In function 'pci_iomap_range':
>       CC      drivers/i2c/i2c-core-base.o
>     ./include/asm-generic/pci_iomap.h:29:41: error: implicit declaration of function 'ioport_map'; did you mean 'ioremap'? [-Werror=implicit-function-declaration]
>        29 | #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
>           |                                         ^~~~~~~~~~
>     lib/pci_iomap.c:44:24: note: in expansion of macro '__pci_ioport_map'
>        44 |                 return __pci_ioport_map(dev, start, len);
>           |                        ^~~~~~~~~~~~~~~~
> 
> This patch adds a NULL definition of __pci_ioport_map for architetures
> which do not support ioport_map.
> 
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Stafford Horne <shorne@...il.com>

Appended to my pci/header-cleanup-immutable branch for v5.20, thanks!

> ---
> The Kconfig I am using to test this is here:
>   https://github.com/stffrdhrn/linux/commits/or1k-virt-4
> 
>  include/asm-generic/pci_iomap.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
> index 5a2f9bf53384..8fbb0a55545d 100644
> --- a/include/asm-generic/pci_iomap.h
> +++ b/include/asm-generic/pci_iomap.h
> @@ -25,6 +25,8 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
>  #ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
>  extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
>  				      unsigned int nr);
> +#elif !defined(CONFIG_HAS_IOPORT_MAP)
> +#define __pci_ioport_map(dev, port, nr) NULL
>  #else
>  #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
>  #endif
> -- 
> 2.36.1
>