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authorTom Herbert <therbert@google.com>2014-05-02 16:28:03 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-05 15:26:29 -0400
commit07064c6e022ba8dc0c86ce12f7851a1de24e04fc (patch)
treef1a0af6e9e69360d987bb8a40ba802f5cd715f97 /include/net/checksum.h
parent2ad064968762534c0f3b552d5fe88496787bade9 (diff)
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>
Diffstat (limited to 'include/net/checksum.h')
-rw-r--r--include/net/checksum.h2
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)
{