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>

1 files changed, 2 insertions, 4 deletions

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index c0d5c3b3a760..5456d11d6ae4 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -157,10 +157,8 @@ void __init init_IRQ(void)
         struct irq_desc *desc;
         int irq;
 
-        for (irq = 0; irq < nr_irqs; irq++) {
-                desc = irq_to_desc_alloc_node(irq, 0);
+        for (irq = 0; irq < nr_irqs; irq++)
                 desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
-        }
 
         init_arch_irq();
 }
@@ -169,7 +167,7 @@ void __init init_IRQ(void)
 int __init arch_probe_nr_irqs(void)
 {
         nr_irqs = arch_nr_irqs ? arch_nr_irqs : NR_IRQS;
-        return 0;
+        return nr_irqs;
 }
 #endif