HRT time doesn't set the interrupt priority, will cause low priority interrupt response

1 
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@file drv_hrt.c

static void
hrt_tim_init(void)
{
	/* claim our interrupt vector */
	irq_attach(HRT_TIMER_VECTOR, hrt_tim_isr);

   	/* clock/power on our timer */
	modifyreg32(HRT_TIMER_POWER_REG, 0, HRT_TIMER_POWER_BIT);

	/* disable and configure the timer */
	rCR1 = 0;
	rCR2 = 0;
	rSMCR = 0;
	rDIER = DIER_HRT | DIER_PPM;
	rCCER = 0;		/* unlock CCMR* registers */
	rCCMR1 = CCMR1_PPM;
	rCCMR2 = CCMR2_PPM;
	rCCER = CCER_PPM;
	rDCR = 0;

	/* configure the timer to free-run at 1MHz */
	rPSC = (HRT_TIMER_CLOCK / 1000000) - 1;	/* this really only works for whole-MHz clocks */

	/* run the full span of the counter */
	rARR = 0xffff;

	/* set an initial capture a little ways off */
	rCCR_HRT = 1000;

	/* generate an update event; reloads the counter, all registers */
	rEGR = GTIM_EGR_UG;

	/* enable the timer */
	rCR1 = GTIM_CR1_CEN;

	/* enable interrupts */
	up_enable_irq(HRT_TIMER_VECTOR);
}

HRT time doesn’t set the interrupt priority, will cause low priority interrupt response??
thank you !!!