irq: initialize nr_irqs based on nr_cpu_ids

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.  This is done by adding a new
"max_nr_irqs" macro to irq_vectors.h (and a dummy in irqnr.h) to
return a max NR_IRQS value based on NR_CPUS or nr_cpu_ids.

This necessitated moving the define of MAX_IO_APICS to a separate
file (asm/apicnum.h) so it could be included without the baggage
of the other asm/apicdef.h declarations.

Signed-off-by: Mike Travis <travis@sgi.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index d0b8f7e72790..ebba7a116f14 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -133,6 +133,9 @@ 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);
+
         printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
 
         desc = irq_desc_legacy;