xen/x86: Don't BUG on CPU0 offlining

vittyvk · jgross1 · commit 0e4d394fe503 · 2017-07-23T08:09:24.000+02:00
CONFIG_BOOTPARAM_HOTPLUG_CPU0 allows to offline CPU0 but Xen HVM guests
BUG() in xen_teardown_timer(). Remove the BUG_ON(), this is probably a
leftover from ancient times when CPU0 hotplug was impossible, it works
just fine for HVM.

Signed-off-by: Vitaly Kuznetsov &lt;vkuznets@redhat.com&gt;
Acked-by: Juergen Gross &lt;jgross@suse.com&gt;
Signed-off-by: Juergen Gross &lt;jgross@suse.com&gt;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
@@ -309,7 +309,6 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
 void xen_teardown_timer(int cpu)
 {
 	struct clock_event_device *evt;
-	BUG_ON(cpu == 0);
 	evt = &per_cpu(xen_clock_events, cpu).evt;
 
 	if (evt->irq >= 0) {

Original file line number	Diff line number	Diff line change
`@@ -309,7 +309,6 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)`
`309`	`309`	`void xen_teardown_timer(int cpu)`
`310`	`310`	`{`
`311`	`311`	`struct clock_event_device *evt;`
`312`		`- BUG_ON(cpu == 0);`
`313`	`312`	`evt = &per_cpu(xen_clock_events, cpu).evt;`
`314`	`313`
`315`	`314`	`if (evt->irq >= 0) {`