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>
diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
index 86af92e..de66e4e 100644
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -20,11 +20,18 @@
# define for_each_irq_desc_reverse(irq, desc) \
for (irq = nr_irqs - 1; irq >= 0; irq--)
+
#else /* CONFIG_GENERIC_HARDIRQS */
+#include <asm/irq_vectors.h> /* need possible max_nr_irqs() */
+
extern int nr_irqs;
extern struct irq_desc *irq_to_desc(unsigned int irq);
+# ifndef max_nr_irqs
+# define max_nr_irqs(nr_cpus) NR_IRQS
+# endif
+
# define for_each_irq_desc(irq, desc) \
for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; \
irq++, desc = irq_to_desc(irq)) \