Subject: Re: powerpc32: add support for csum_add()

From: Jochen Rollwagen <[email-masked]>
Date: Mon, 13 Oct 2014 18:23:08 +0200

Am 13.10.2014 um 13:17 schrieb leroy christophe:
> Le 12/10/2014 18:22, Jochen Rollwagen a écrit :
>> This patch
>>
>> https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-September/121144.html
>>
>> only compiles after putting an #ifndef ARCH_HAS_CSUM_ADD around the 
>> definition in include/net/checksum.h
>>
>> This is missing from the patch
>>
>>
>
> This is already included upstream since May 2014, see patch below
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=07064c6e022ba8dc0c86ce12f7851a1de24e04fc
>
>  From 07064c6e022ba8dc0c86ce12f7851a1de24e04fc Mon Sep 17 00:00:00 2001
> From: Tom Herbert<[email-masked]>
> Date: Fri, 2 May 2014 16:28:03 -0700
> Subject: net: Allow csum_add to be provided in arch
>
> csum_add is really nothing more then add-with-carry which
> can be implemented efficiently in some architectures.
> Allow architecture to define this protected by HAVE_ARCH_CSUM_ADD.
>
> Signed-off-by: Tom Herbert<[email-masked]>
> Signed-off-by: David S. Miller<[email-masked]>
>
> diff --git a/include/net/checksum.h b/include/net/checksum.h
> index a28f4e0..87cb190 100644
> --- a/include/net/checksum.h
> +++ b/include/net/checksum.h
> @@ -57,12 +57,14 @@ static __inline__ __wsum csum_and_copy_to_user
>   }
>   #endif
>   
> +#ifndef HAVE_ARCH_CSUM_ADD
>   static inline __wsum csum_add(__wsum csum, __wsum addend)
>   {
>   	u32 res = (__force u32)csum;
>   	res += (__force u32)addend;
>   	return (__force __wsum)(res + (res < (__force u32)addend));
>   }
> +#endif
>   
>   static inline __wsum csum_sub(__wsum csum, __wsum addend)
>   {
> -- 
> cgit v0.10.1
>
>
Ah bon. Obviously this wasn't backported to 3.14, that's what i compiled 
for. So i backported the 2 Lines of code manually et tout est bon.

Salut

Jochen