revised version according to Eric. and it can be applied clearly to
current Linus's Tree.
Clear the irq releated entries in irq_vector, irq_domain and vector_irq
instead of clearing irq_vector only. So when new irq is created, it
could reuse that vector. (actually is the second loop scanning from
FIRST_DEVICE_VECTOR+8). This could avoid the vectors are used up
with enough module inserting and removing
Cc: Eric W. Biedierman <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Signed-off-By: Yinghai Lu <[email protected]>
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index fe429e5..976634c 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -684,6 +684,22 @@ static int assign_irq_vector(int irq, cp
return vector;
}
+static void __clear_irq_vector(int irq)
+{
+ cpumask_t mask;
+ int cpu, vector;
+
+ BUG_ON(!irq_vector[irq]);
+
+ vector = irq_vector[irq];
+ cpus_and(mask, irq_domain[irq], cpu_online_map);
+ for_each_cpu_mask(cpu, mask)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+
+ irq_vector[irq] = 0;
+ irq_domain[irq] = CPU_MASK_NONE;
+}
+
void __setup_vector_irq(int cpu)
{
/* Initialize vector_irq on a new cpu */
@@ -1771,7 +1787,7 @@ void destroy_irq(unsigned int irq)
dynamic_irq_cleanup(irq);
spin_lock_irqsave(&vector_lock, flags);
- irq_vector[irq] = 0;
+ __clear_irq_vector(irq);
spin_unlock_irqrestore(&vector_lock, flags);
}
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