Commit 07064c6e authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

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: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2ad06496

include/net/checksum.h

+2 −0
Original line number Diff line number Diff line
@@ -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)

{