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Commit cb9c6f15 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/spinlock: Check against default value of -1 for IRQ line. 



The default (uninitialized) value of the IRQ line is -1.
Check if we already have allocated an spinlock interrupt line
and if somebody is trying to do it again. Also set it to -1
when we offline the CPU.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent ef35a4e6

arch/x86/xen/spinlock.c

+4 −0
Original line number Diff line number Diff line
@@ -364,6 +364,9 @@ void __cpuinit xen_init_lock_cpu(int cpu) 
	int irq;

	const char *name;



	WARN(per_cpu(lock_kicker_irq, cpu) > 0, "spinlock on CPU%d exists on IRQ%d!\n",

	     cpu, per_cpu(lock_kicker_irq, cpu));



	name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);

	irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,

				     cpu,
@@ -383,6 +386,7 @@ void __cpuinit xen_init_lock_cpu(int cpu) 
void xen_uninit_lock_cpu(int cpu)

{

	unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);

	per_cpu(lock_kicker_irq, cpu) = -1;

}



void __init xen_init_spinlocks(void)