[PATCH] x86-64 cmpxchg adjustment

[Jan Beulich]

(Note: Patch also attached because the inline version is certain to get
line wrapped.)

While only cosmetic for x86-64, this adjusts the cmpxchg code
appearantly
inherited from i386 to use more generic constraints.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

diff -Npru 2.6.13/include/asm-x86_64/system.h
2.6.13-x86_64-cmpxchg/include/asm-x86_64/system.h
--- 2.6.13/include/asm-x86_64/system.h	2005-08-29 01:41:01.000000000
+0200
+++ 2.6.13-x86_64-cmpxchg/include/asm-x86_64/system.h	2005-09-01
11:32:12.000000000 +0200
@@ -247,25 +247,25 @@ static inline unsigned long __cmpxchg(vo
 	case 1:
 		__asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2"
 				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)),
"0"(old)
+				     : "r"(new), "m"(*__xg(ptr)),
"0"(old)
 				     : "memory");
 		return prev;
 	case 2:
 		__asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2"
 				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)),
"0"(old)
+				     : "r"(new), "m"(*__xg(ptr)),
"0"(old)
 				     : "memory");
 		return prev;
 	case 4:
 		__asm__ __volatile__(LOCK_PREFIX "cmpxchgl %k1,%2"
 				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)),
"0"(old)
+				     : "r"(new), "m"(*__xg(ptr)),
"0"(old)
 				     : "memory");
 		return prev;
 	case 8:
 		__asm__ __volatile__(LOCK_PREFIX "cmpxchgq %1,%2"
 				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)),
"0"(old)
+				     : "r"(new), "m"(*__xg(ptr)),
"0"(old)
 				     : "memory");
 		return prev;
 	}

Attachment: linux-2.6.13-x86_64-cmpxchg.patch
Description: Binary data