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[1/5] s390/cmpxchg: use symbolic names for inline assembly operands
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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 --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; }