linux-kernel - Re: [PATCH] media: fsl-viu: Use proper check for presence of {out,in}

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Date:   Fri, 15 Jun 2018 10:10:43 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: fsl-viu: Use proper check for presence of
 {out,in}_be32()

On 08/06/18 11:48, Geert Uytterhoeven wrote:
> When compile-testing on m68k or microblaze:
> 
>     drivers/media/platform/fsl-viu.c:41:1: warning: "out_be32" redefined
>     drivers/media/platform/fsl-viu.c:42:1: warning: "in_be32" redefined
> 
> Fix this by replacing the check for PowerPC by checks for the presence
> of {out,in}_be32().
> 
> As PowerPC implements the be32 accessors using inline functions instead
> of macros, identity definions are added for all accessors to make the
> above checks work.
> 
> Fixes: 29d750686331a1a9 ("media: fsl-viu: allow building it with COMPILE_TEST")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Reviewed-by: Hans Verkuil <hans.verkuil@...co.com>

Should this go through the media tree or powerpc tree? Either way works for me.

Regards,

	Hans

> ---
> Compile-tested on m68k, microblaze, and powerpc.
> Assembler output before/after compared for powerpc.
> ---
>  arch/powerpc/include/asm/io.h    | 14 ++++++++++++++
>  drivers/media/platform/fsl-viu.c |  4 +++-
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
> index e0331e7545685c5f..3741183ae09349f1 100644
> --- a/arch/powerpc/include/asm/io.h
> +++ b/arch/powerpc/include/asm/io.h
> @@ -222,6 +222,20 @@ static inline void out_be64(volatile u64 __iomem *addr, u64 val)
>  #endif
>  #endif /* __powerpc64__ */
>  
> +#define in_be16 in_be16
> +#define in_be32 in_be32
> +#define in_be64 in_be64
> +#define in_le16 in_le16
> +#define in_le32 in_le32
> +#define in_le64 in_le64
> +
> +#define out_be16 out_be16
> +#define out_be32 out_be32
> +#define out_be64 out_be64
> +#define out_le16 out_le16
> +#define out_le32 out_le32
> +#define out_le64 out_le64
> +
>  /*
>   * Low level IO stream instructions are defined out of line for now
>   */
> diff --git a/drivers/media/platform/fsl-viu.c b/drivers/media/platform/fsl-viu.c
> index e41510ce69a40815..5d5e030c9c980647 100644
> --- a/drivers/media/platform/fsl-viu.c
> +++ b/drivers/media/platform/fsl-viu.c
> @@ -37,8 +37,10 @@
>  #define VIU_VERSION		"0.5.1"
>  
>  /* Allow building this driver with COMPILE_TEST */
> -#ifndef CONFIG_PPC
> +#ifndef out_be32
>  #define out_be32(v, a)	iowrite32be(a, (void __iomem *)v)
> +#endif
> +#ifndef in_be32
>  #define in_be32(a)	ioread32be((void __iomem *)a)
>  #endif
>  
>