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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-04-16 14:33:20 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-04-16 16:05:15 -0400
commitcb9c6f15f318aa3aeb62fe525aa5c6dcf6eee159 (patch)
tree804a98f6f928a5f27bf69f1b31f40d26867b78aa /arch/x86/xen/spinlock.c
parentef35a4e6d9eef3bd904b8c6b85618a2e878e801e (diff)
downloadlinux-cb9c6f15f318aa3aeb62fe525aa5c6dcf6eee159.tar.bz2
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>
Diffstat (limited to 'arch/x86/xen/spinlock.c')
-rw-r--r--arch/x86/xen/spinlock.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index f7a080ef0354..47ae032f8d97 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -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)