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x86: arch_probe_nr_irqs

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Impact: save RAM with large NR_CPUS, get smaller nr_irqs

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Mike Travis <travis@sgi.com>
This commit is contained in:
Yinghai Lu 2009-01-12 17:39:24 -08:00 • committed by Mike Travis
parent e65e49d0f3
commit 4a046d1754
5 changed files with 26 additions and 12 deletions
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9
kernel/irq/handle.c
View file

@ -59,10 +59,6 @@ EXPORT_SYMBOL_GPL(nr_irqs);
#ifdef CONFIG_SPARSE_IRQ
#ifndef max_nr_irqs
#define max_nr_irqs(nr_cpus) NR_IRQS
#endif
static struct irq_desc irq_desc_init = {
.irq = -1,
.status = IRQ_DISABLED,
@ -137,9 +133,8 @@ int __init early_irq_init(void)
int legacy_count;
int i;
/* initialize nr_irqs based on nr_cpu_ids */
nr_irqs = max_nr_irqs(nr_cpu_ids);
/* initialize nr_irqs based on nr_cpu_ids */
arch_probe_nr_irqs();
printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
desc = irq_desc_legacy;

5
kernel/softirq.c
View file

@ -795,6 +795,11 @@ int __init __weak early_irq_init(void)
return 0;
}
int __init __weak arch_probe_nr_irqs(void)
{
return 0;
}
int __init __weak arch_early_irq_init(void)
{
return 0;