linux-kernel - Re: [PATCH] sh: fix asm-generic/io.h inclusion

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Date:   Thu, 3 Aug 2023 07:38:44 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Guenter Roeck <linux@...ck-us.net>, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: fix asm-generic/io.h inclusion

On 08/02/23 at 04:16pm, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> A recent cleanup patch started using the generic asm/io.h header from
> the sh version, but unfortunately this caused build regressions in many
> configurations, such as:
> 
> include/asm-generic/io.h:636:15: error: redefinition of ‘inb_p’
> 
> I added some of the missing defines that are needed to keep using the
> sh specific implementations rather than the generic ones where they
> clash. I build all sh defconfig files to catch the various combinations
> of CONFIG_MMU, CONFIG_GENERIC_IOMAP and CONFIG_NO_IOPORT_MAP, this should
> cover them all.
> 
> A lot of the sh specific functions are equivalent to the generic ones
> and could in fact be removed, but it would be best to only do that with
> actual runtime testing.
> 
> In particular, the indirect ioport_map() implementation is only used
> for the "microdev" platform that appears to be broken beyond repair
> for as long as the git history goes, so removing both microdev and the
> custom ioport handling in favor of the asm-generic/io.h version would
> be a great cleanup, but this can be done another time if anyone feels
> motivated to clean up arch/sh.
> 
> Fixes: e41f1f7ff6c2b ("sh: add <asm-generic/io.h> including")
> Link: https://lore.kernel.org/lkml/09094baf-dadf-4bce-9f63-f2a1f255f9a8@app.fastmail.com/
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> Andrew, can you pick this up into the mm tree on top of the
> "sh: add <asm-generic/io.h> including" patch?
> ---
>  arch/sh/include/asm/io.h          | 24 ++++++++++++++++++++++++
>  arch/sh/include/asm/io_noioport.h | 14 --------------
>  2 files changed, 24 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
> index 24c560c065ec7..f2f38e9d489ac 100644
> --- a/arch/sh/include/asm/io.h
> +++ b/arch/sh/include/asm/io.h
> @@ -119,6 +119,10 @@ void __raw_readsl(const void __iomem *addr, void *data, int longlen);
>  
>  __BUILD_MEMORY_STRING(__raw_, q, u64)
>  
> +#define ioport_map ioport_map
> +#define ioport_unmap ioport_unmap
> +#define pci_iounmap pci_iounmap
> +
>  #define ioread8 ioread8
>  #define ioread16 ioread16
>  #define ioread16be ioread16be
> @@ -241,6 +245,26 @@ __BUILD_IOPORT_STRING(q, u64)
>  
>  #endif
>  
> +#define inb(addr)      inb(addr)
> +#define inw(addr)      inw(addr)
> +#define inl(addr)      inl(addr)
> +#define outb(x, addr)  outb((x), (addr))
> +#define outw(x, addr)  outw((x), (addr))
> +#define outl(x, addr)  outl((x), (addr))
> +
> +#define inb_p(addr)    inb(addr)
> +#define inw_p(addr)    inw(addr)
> +#define inl_p(addr)    inl(addr)
> +#define outb_p(x, addr)        outb((x), (addr))
> +#define outw_p(x, addr)        outw((x), (addr))
> +#define outl_p(x, addr)        outl((x), (addr))
> +
> +#define insb insb
> +#define insw insw
> +#define insl insl
> +#define outsb outsb
> +#define outsw outsw
> +#define outsl outsl
>  
>  #define IO_SPACE_LIMIT 0xffffffff
>  
> diff --git a/arch/sh/include/asm/io_noioport.h b/arch/sh/include/asm/io_noioport.h
> index 5ba4116b4265c..12dad91f41c1e 100644
> --- a/arch/sh/include/asm/io_noioport.h
> +++ b/arch/sh/include/asm/io_noioport.h
> @@ -46,20 +46,6 @@ static inline void ioport_unmap(void __iomem *addr)
>  	BUG();
>  }
>  
> -#define inb_p(addr)	inb(addr)
> -#define inw_p(addr)	inw(addr)
> -#define inl_p(addr)	inl(addr)
> -#define outb_p(x, addr)	outb((x), (addr))
> -#define outw_p(x, addr)	outw((x), (addr))
> -#define outl_p(x, addr)	outl((x), (addr))
> -
> -#define insb insb
> -#define insw insw
> -#define insl insl
> -#define outsb outsb
> -#define outsw outsw
> -#define outsl outsl

Thanks for this fixing.

Reviewed-by: Baoquan He <bhe@...hat.com>