1 files changed, 42 insertions, 32 deletions

diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index dd24434392b6..b339798b3172 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -26,6 +26,48 @@
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
+static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
+
+int __devinit allocate_irqno(void)
+{
+        int irq;
+
+again:
+        irq = find_first_zero_bit(irq_map, NR_IRQS);
+
+        if (irq >= NR_IRQS)
+                return -ENOSPC;
+
+        if (test_and_set_bit(irq, irq_map))
+                goto again;
+
+        return irq;
+}
+
+EXPORT_SYMBOL_GPL(allocate_irqno);
+
+/*
+ * Allocate the 16 legacy interrupts for i8259 devices.  This happens early
+ * in the kernel initialization so treating allocation failure as BUG() is
+ * ok.
+ */
+void __init alloc_legacy_irqno(void)
+{
+        int i;
+
+        for (i = 0; i <= 16; i++)
+                BUG_ON(test_and_set_bit(i, irq_map));
+}
+
+void __devinit free_irqno(unsigned int irq)
+{
+        smp_mb__before_clear_bit();
+        clear_bit(irq, irq_map);
+        smp_mb__after_clear_bit();
+}
+
+EXPORT_SYMBOL_GPL(free_irqno);
+
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.
  * each architecture has to answer this themselves.
@@ -46,25 +88,6 @@ atomic_t irq_err_count;
 unsigned long irq_hwmask[NR_IRQS];
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-#undef do_IRQ
-
-/*
- * do_IRQ handles all normal device IRQ's (the special
- * SMP cross-CPU interrupts have their own specific
- * handlers).
- */
-asmlinkage unsigned int do_IRQ(unsigned int irq)
-{
-        irq_enter();
-
-        __DO_IRQ_SMTC_HOOK();
-        __do_IRQ(irq);
-
-        irq_exit();
-
-        return 1;
-}
-
 /*
  * Generic, controller-independent functions:
  */
@@ -130,19 +153,6 @@ __setup("nokgdb", nokgdb);
 
 void __init init_IRQ(void)
 {
-        int i;
-
-        for (i = 0; i < NR_IRQS; i++) {
-                irq_desc[i].status  = IRQ_DISABLED;
-                irq_desc[i].action  = NULL;
-                irq_desc[i].depth   = 1;
-                irq_desc[i].chip = &no_irq_chip;
-                spin_lock_init(&irq_desc[i].lock);
-#ifdef CONFIG_MIPS_MT_SMTC
-                irq_hwmask[i] = 0;
-#endif /* CONFIG_MIPS_MT_SMTC */
-        }
-
         arch_init_irq();
 
 #ifdef CONFIG_KGDB