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x86/time: Unconditionally register legacy timer interrupt 

Even without a PIC/PIT the legacy timer interrupt is required for HPET in
legacy replacement mode.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: len.brown@intel.com
Cc: rui.zhang@intel.com
Link: https://lkml.kernel.org/r/20171222092243.382623763@infradead.org
This commit is contained in:
Peter Zijlstra 2017-12-22 10:20:12 +01:00 committed by Thomas Gleixner
parent 30c7e5b123
commit 6d671e1b85
1 changed files with 6 additions and 3 deletions
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9
arch/x86/kernel/time.c
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@ -69,9 +69,12 @@ static struct irqaction irq0 = {
static void __init setup_default_timer_irq(void)
{
if (!nr_legacy_irqs())
return;
setup_irq(0, &irq0);
/*
* Unconditionally register the legacy timer; even without legacy
* PIC/PIT we need this for the HPET0 in legacy replacement mode.
*/
if (setup_irq(0, &irq0))
pr_info("Failed to register legacy timer interrupt\n");
}
/* Default timer init function */