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| author | Tom Herbert <therbert@google.com> | 2014-05-02 16:28:03 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-05 15:26:29 -0400 |
| commit | 07064c6e022ba8dc0c86ce12f7851a1de24e04fc (patch) | |
| tree | f1a0af6e9e69360d987bb8a40ba802f5cd715f97 | |
| parent | 2ad064968762534c0f3b552d5fe88496787bade9 (diff) | |
| download | lwn-07064c6e022ba8dc0c86ce12f7851a1de24e04fc.tar.gz lwn-07064c6e022ba8dc0c86ce12f7851a1de24e04fc.zip | |
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>
| -rw-r--r-- | include/net/checksum.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h index a28f4e0f6251..87cb1903640d 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) { |