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[2/9,v2] x86_64: csum_add for x86_64

Message ID alpine.DEB.2.02.1404261359490.26798@tomh.mtv.corp.google.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Tom Herbert April 26, 2014, 9:24 p.m. UTC 
Add csum_add function for x86_64.

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

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 */