x86: make 32bit support per_cpu vector

so we can merge io_apic_32.c and io_apic_64.c

v2: Use cpu_online_map as target cpus for bigsmp, just like 64-bit is doing.

Also remove some unused TARGET_CPUS macro.

v3: need to check if desc is null in smp_irq_move_cleanup

also migration needs to reset vector too, so copy __target_IO_APIC_irq
from 64bit.

(the duplication will go away once the two files are unified.)

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

1 files changed, 11 insertions, 7 deletions

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 0a57e39159a..b51ffdcfa31 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -223,21 +223,25 @@ unsigned int do_IRQ(struct pt_regs *regs)
 {
         struct pt_regs *old_regs;
         /* high bit used in ret_from_ code */
-        int overflow, irq = ~regs->orig_ax;
+        int overflow;
+        unsigned vector = ~regs->orig_ax;
         struct irq_desc *desc;
+        unsigned irq;
 
-        desc = irq_to_desc(irq);
-        if (unlikely(!desc)) {
-                printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
-                                        __func__, irq);
-                BUG();
-        }
 
         old_regs = set_irq_regs(regs);
         irq_enter();
+        irq = __get_cpu_var(vector_irq)[vector];
 
         overflow = check_stack_overflow();
 
+        desc = irq_to_desc(irq);
+        if (unlikely(!desc)) {
+                printk(KERN_EMERG "%s: cannot handle IRQ %d vector %#x\n",
+                                        __func__, irq, vector);
+                BUG();
+        }
+
         if (!execute_on_irq_stack(overflow, desc, irq)) {
                 if (unlikely(overflow))
                         print_stack_overflow();