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| author | Heiko Carstens <hca@linux.ibm.com> | 2022-11-02 17:18:07 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2022-11-21 15:36:15 +0300 |
| commit | e388d66f032166c8e8c4efd9e6c6f43610378903 (patch) | |
| tree | b970ae27fe944c1ef27901897ec3736fe5a606e4 /arch/s390/include/asm/cmpxchg.h | |
| parent | ce968f654570dbd9cac7de694681640061559d3b (diff) | |
| download | linux-e388d66f032166c8e8c4efd9e6c6f43610378903.tar.xz | |
s390/cmpxchg: remove digits from input constraints
Instead of using a digit for input constraints simply initialize the
corresponding output operand in C code and use a "+" constraint
modifier.
Link: https://lore.kernel.org/r/Y2J8H82B6JhJhrp2@osiris
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/s390/include/asm/cmpxchg.h | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h index 02165acdaa93..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" ((unsigned int)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; } |