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

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Date:   Fri, 18 Jan 2019 11:07:50 +0100
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()

Hi Geert,

This patch is still in my patchwork todo list, and I wonder who will pick this up,
especially the change to arch/powerpc/include/asm/io.h.

Wouldn't it be easier to just fix this in fsl-viu.c only by doing this:

#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
#endif

Basically just your patch, but without removing #ifndef CONFIG_PPC.

That way there is no need to touch arch/powerpc/include/asm/io.h.

Regards,

	Hans

On 6/15/18 10:10 AM, Hans Verkuil wrote:
> 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
>>  
>>
> 
>