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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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
hifive-unleashed-5.1
Konrad Rzeszutek Wilk 2013-04-16 14:33:20 -04:00
parent ef35a4e6d9
commit cb9c6f15f3
1 changed files with 4 additions and 0 deletions
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4
arch/x86/xen/spinlock.c
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@ -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)