in x86 architecture ,why the function atomic_sub_and_test() does not disable the interrupt?

[æç]

static inline int atomic_sub_and_test(int i, atomic_t *v)
{
	unsigned char c;

	asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"
		     : "+m" (v->counter), "=qm" (c)
		     : "ir" (i) : "memory");
	return c;
}

TIA:)
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