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s390/spinlock: use R constraint in inline assembly

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Allow the compiler to generate slightly better code by using the R
constraint.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-03-22 16:12:56 +01:00
parent 000174233b
commit 4f9abb7e70
1 changed files with 1 additions and 1 deletions
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2
arch/s390/include/asm/spinlock.h
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@ -88,7 +88,7 @@ static inline void arch_spin_unlock(arch_spinlock_t *lp)
asm_inline volatile(
ALTERNATIVE("", ".long 0xb2fa0070", 49) /* NIAI 7 */
" sth %1,%0\n"
: "=Q" (((unsigned short *) &lp->lock)[1])
: "=R" (((unsigned short *) &lp->lock)[1])
: "d" (0) : "cc", "memory");
}