x86: make 32 bit to use sparse_irq

but actually irq still needs to be less than NR_IRQS, because
interrupt[NR_IRQS] in entry.S.

need to enable per_cpu vector...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c
index 65c1c9507707..ded09ac2642e 100644
--- a/arch/x86/kernel/irqinit_32.c
+++ b/arch/x86/kernel/irqinit_32.c
@@ -69,6 +69,13 @@ void __init init_ISA_irqs (void)
          * 16 old-style INTA-cycle interrupts:
          */
         for (i = 0; i < 16; i++) {
+                /* first time call this irq_desc */
+                struct irq_desc *desc = irq_to_desc_alloc(i);
+
+                desc->status = IRQ_DISABLED;
+                desc->action = NULL;
+                desc->depth = 1;
+
                 set_irq_chip_and_handler_name(i, &i8259A_chip,
                                               handle_level_irq, "XT");
         }