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s390/futex: Cleanup futex_atomic_cmpxchg_inatomic()

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Cleanup the futex_atomic_cmpxchg_inatomic() inline assembly to make it
a bit more readable.

Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2025-01-21 15:55:01 +01:00
committed by Alexander Gordeev
parent 9e8f72f773
commit 554f8842dc
1 changed files with 11 additions and 10 deletions
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21
arch/s390/include/asm/futex.h
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@@ -71,19 +71,20 @@ int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
u32 oldval, u32 newval)
{
int ret;
int rc;
asm volatile(
" sacf 256\n"
"0: cs %1,%4,0(%5)\n"
"1: la %0,0\n"
"2: sacf 768\n"
EX_TABLE(0b,2b) EX_TABLE(1b,2b)
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
asm_inline volatile(
" sacf 256\n"
"0: cs %[old],%[new],%[uaddr]\n"
"1: lhi %[rc],0\n"
"2: sacf 768\n"
EX_TABLE_UA_FAULT(0b, 2b, %[rc])
EX_TABLE_UA_FAULT(1b, 2b, %[rc])
: [rc] "=d" (rc), [old] "+d" (oldval), [uaddr] "+Q" (*uaddr)
: [new] "d" (newval)
: "cc", "memory");
*uval = oldval;
return ret;
return rc;
}
#endif /* _ASM_S390_FUTEX_H */