x86: arch_probe_nr_irqs
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>
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 04d3e46..375d68c 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -59,10 +59,6 @@
#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 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;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index bdbe9de..0365b48 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -795,6 +795,11 @@
return 0;
}
+int __init __weak arch_probe_nr_irqs(void)
+{
+ return 0;
+}
+
int __init __weak arch_early_irq_init(void)
{
return 0;