diff mbox series

[3/5] s390/cmpxchg: remove digits from input constraints

Message ID Y2J8H82B6JhJhrp2@osiris (mailing list archive)
State Accepted
Commit e388d66f032166c8e8c4efd9e6c6f43610378903
Headers show
Series [1/5] s390/cmpxchg: use symbolic names for inline assembly operands | expand

Commit Message

Heiko Carstens Nov. 2, 2022, 2:18 p.m. UTC 
Instead of using a digit for input constraints simply initialize the
corresponding output operand in C code and use a "+" constraint
modifier.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 arch/s390/include/asm/cmpxchg.h | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h
index 2ad057b94481..1c5785b851ec 100644
--- a/arch/s390/include/asm/cmpxchg.h
+++ b/arch/s390/include/asm/cmpxchg.h
@@ -142,26 +142,24 @@  static __always_inline unsigned long __cmpxchg(unsigned long address,
 		return prev >> shift;
 	}
 	case 4: {
-		unsigned int prev;
+		unsigned int prev = old;
 
 		asm volatile(
 			"	cs	%[prev],%[new],%[address]\n"
-			: [prev] "=&d" (prev),
+			: [prev] "+&d" (prev),
 			  [address] "+Q" (*(int *)address)
-			: "0" (old),
-			  [new] "d" (new)
+			: [new] "d" (new)
 			: "memory", "cc");
 		return prev;
 	}
 	case 8: {
-		unsigned long prev;
+		unsigned long prev = old;
 
 		asm volatile(
 			"	csg	%[prev],%[new],%[address]\n"
-			: [prev] "=&d" (prev),
+			: [prev] "+&d" (prev),
 			  [address] "+QS" (*(long *)address)
-			: "0" (old),
-			  [new] "d" (new)
+			: [new] "d" (new)
 			: "memory", "cc");
 		return prev;
 	}