Commit 07064c6e authored May 02, 2014 by Tom Herbert Committed by David S. Miller May 05, 2014

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 <therbert@google.com>
Signed-off-by: David 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)
		{