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Date:	Fri, 2 May 2014 16:28:03 -0700 (PDT)
From:	Tom Herbert <>
Subject: [PATCH 1/8 v4] 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 <>
 include/net/checksum.h | 2 ++
 1 file changed, 2 insertions(+)

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
 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));
 static inline __wsum csum_sub(__wsum csum, __wsum addend)

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