netdev - [PATCH 3/8 v3] net: Change x86_64 add32_with

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Message-ID: <alpine.DEB.2.02.1404290859470.9143@tomh.mtv.corp.google.com>
Date:	Tue, 29 Apr 2014 09:18:09 -0700 (PDT)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: [PATCH 3/8 v3] net: Change x86_64 add32_with_carry to allow memory
 operand

>From Eric Dumazet:

Note add32_with_carry(a, b) is suboptimal, as it forces
a and b in registers.

b could be a memory or a register operand.

Signed-off-by: Tom Herbert <therbert@...gle.com>
---
 arch/x86/include/asm/checksum_64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/checksum_64.h b/arch/x86/include/asm/checksum_64.h
index 3581761..cd00e17 100644
--- a/arch/x86/include/asm/checksum_64.h
+++ b/arch/x86/include/asm/checksum_64.h
@@ -184,7 +184,7 @@ static inline unsigned add32_with_carry(unsigned a, unsigned b)
 	asm("addl %2,%0\n\t"
 	    "adcl $0,%0"
 	    : "=r" (a)
-	    : "0" (a), "r" (b));
+	    : "0" (a), "rm" (b));
 	return a;
 }
 
-- 
1.9.1.423.g4596e3a

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