linux-kernel - [PATCH 2/9] powerpc: mark xer clobbered in csum

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Message-Id: <14f0f70d1e59f423f58705d2c6ba971373f45481.1442876807.git.christophe.leroy@c-s.fr>
Date:	Tue, 22 Sep 2015 16:34:21 +0200 (CEST)
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>, scottwood@...escale.com
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org
Subject: [PATCH 2/9] powerpc: mark xer clobbered in csum_add()

addc uses carry so xer is clobbered in csum_add()

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/checksum.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h
index e8d9ef4..d2ca07b 100644
--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h
@@ -141,7 +141,7 @@ static inline __wsum csum_add(__wsum csum, __wsum addend)
 #else
 	asm("addc %0,%0,%1;"
 	    "addze %0,%0;"
-	    : "+r" (csum) : "r" (addend));
+	    : "+r" (csum) : "r" (addend) : "xer");
 	return csum;
 #endif
 }
-- 
2.1.0

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