genirq: Query arch for number of early descriptors
sparse irq sets up NR_IRQS_LEGACY irq descriptors and archs then go
ahead and allocate more.
Use the unused return value of arch_probe_nr_irqs() to let the
architecture return the number of early allocations. Fix up all users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 7cbe4f9..a1fbd1d 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -226,16 +226,16 @@
int __init early_irq_init(void)
{
- int i, node = first_online_node;
+ int i, initcnt, node = first_online_node;
struct irq_desc *desc;
init_irq_default_affinity();
- /* 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);
+ /* Let arch update nr_irqs and return the nr of preallocated irqs */
+ initcnt = arch_probe_nr_irqs();
+ printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
- for (i = 0; i < NR_IRQS_LEGACY; i++) {
+ for (i = 0; i < initcnt; i++) {
desc = alloc_desc(i, node);
set_bit(i, allocated_irqs);
irq_insert_desc(i, desc);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 07b4f1b..14a7b80 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -886,9 +886,10 @@
return 0;
}
+#ifdef CONFIG_GENERIC_HARDIRQS
int __init __weak arch_probe_nr_irqs(void)
{
- return 0;
+ return NR_IRQS_LEGACY;
}
int __init __weak arch_early_irq_init(void)
@@ -900,3 +901,4 @@
{
return 0;
}
+#endif
