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[PATCH] x86-64: Extend clear_irq_vector 

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 <ebiederm@xmission.com>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-By: Yinghai Lu <yinghai.lu@amd.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Yinghai Lu 2006-12-07 02:14:05 +01:00 committed by Andi Kleen
parent 3760dd6efa
commit 5df0287ecc
1 changed files with 17 additions and 1 deletions
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18
arch/x86_64/kernel/io_apic.c
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@ -750,6 +750,22 @@ static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
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 */
@ -1837,7 +1853,7 @@ 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);
}