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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>
This commit is contained in:
Heiko Carstens 2022-11-02 15:18:07 +01:00
parent ce968f6545
commit e388d66f03
1 changed files with 6 additions and 8 deletions
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14
arch/s390/include/asm/cmpxchg.h
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@ -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;
}