diff --git a/arch/s390/include/asm/preempt.h b/arch/s390/include/asm/preempt.h index ef6ea3163c27..6e5821bb047e 100644 --- a/arch/s390/include/asm/preempt.h +++ b/arch/s390/include/asm/preempt.h @@ -113,7 +113,22 @@ static __always_inline void __preempt_count_sub(int val) */ static __always_inline bool __preempt_count_dec_and_test(void) { +#ifdef __HAVE_ASM_FLAG_OUTPUTS__ + unsigned long lc_preempt; + int cc; + + lc_preempt = offsetof(struct lowcore, preempt_count); + asm_inline( + ALTERNATIVE("alsi %[offzero](%%r0),%[val]\n", + "alsi %[offalt](%%r0),%[val]\n", + ALT_FEATURE(MFEATURE_LOWCORE)) + : "=@cc" (cc), "+m" (((struct lowcore *)0)->preempt_count) + : [offzero] "i" (lc_preempt), [val] "i" (-1), + [offalt] "i" (lc_preempt + LOWCORE_ALT_ADDRESS)); + return (cc == 0) || (cc == 2); +#else return __atomic_add_const_and_test(-1, &get_lowcore()->preempt_count); +#endif } /*