x86: add debug info for 32bit sparse_irq

so could figure out bugs where we get an interrupt, but vector_irq is
not initialized yet.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index ea33d3c74970..3001924bdd36 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -1114,8 +1114,12 @@ next:
                         cfg->move_in_progress = 1;
                         cfg->old_domain = cfg->domain;
                 }
-                for_each_cpu_mask_nr(new_cpu, new_mask)
-                        per_cpu(vector_irq, new_cpu)[vector] = irq;
+                printk(KERN_DEBUG "assign_irq_vector: irq %d vector %#x cpu ", irq, vector);
+                for_each_cpu_mask_nr(new_cpu, new_mask) {
+                        per_cpu(vector_irq, new_cpu)[vector] = irq;
+                        printk(KERN_CONT " %d ", new_cpu);
+                }
+                printk(KERN_CONT "\n");
                 cfg->vector = vector;
                 cfg->domain = domain;
                 return 0;