[PATCH 3/4] irq: initialize nr_irqs based on nr_cpu_ids

[Mike Travis]

Impact: Reduce memory usage.

This is the second half of the changes to make the irq_desc_ptrs be
variable sized based on nr_cpu_ids.  The algorithm is the same as the
setting of NR_IRQS except use nr_cpu_ids instead of NR_CPUS.  This is
only when CONFIG_SPARSE_IRQS=y.

Signed-off-by: Mike Travis <travis@xxxxxxx>
---
 kernel/irq/handle.c |    5 +++++
 1 file changed, 5 insertions(+)

Files linux-2.6-for-ingo.orig/kernel/irq/.handle.c.swp and linux-2.6-for-ingo/kernel/irq/.handle.c.swp differ
--- linux-2.6-for-ingo.orig/kernel/irq/handle.c
+++ linux-2.6-for-ingo/kernel/irq/handle.c
@@ -133,6 +133,11 @@ int __init early_irq_init(void)
 	int legacy_count;
 	int i;
 
+	/* initialize nr_irqs based on nr_cpu_ids */
+ 	nr_irqs =  (8 * nr_cpu_ids) > (32 * MAX_IO_APICS) ?
+ 			NR_VECTORS + (8 * nr_cpu_ids) :
+ 			NR_VECTORS + (32 * MAX_IO_APICS);
+
 	printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
 
 	desc = irq_desc_legacy;

-- 
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