netdev - [PATCH 2/8 v4] x86_64: csum_add for x86

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Message-ID: <alpine.DEB.2.02.1405021527190.19510@tomh.mtv.corp.google.com>
Date:	Fri, 2 May 2014 16:28:15 -0700 (PDT)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 2/8 v4] x86_64: csum_add for x86_64

Add csum_add function for x86_64.

Signed-off-by: Tom Herbert <therbert@...gle.com>
---
 arch/x86/include/asm/checksum_64.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/checksum_64.h b/arch/x86/include/asm/checksum_64.h
index e6fd8a0..3581761 100644
--- a/arch/x86/include/asm/checksum_64.h
+++ b/arch/x86/include/asm/checksum_64.h
@@ -188,4 +188,11 @@ static inline unsigned add32_with_carry(unsigned a, unsigned b)
 	return a;
 }
 
+#define HAVE_ARCH_CSUM_ADD
+static inline __wsum csum_add(__wsum csum, __wsum addend)
+{
+	return (__force __wsum)add32_with_carry((__force unsigned)csum,
+						(__force unsigned)addend);
+}
+
 #endif /* _ASM_X86_CHECKSUM_64_H */
-- 
1.9.1.423.g4596e3a

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