This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / kernel / irq / migration.c

diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
new file mode 100644 (file)
index 0000000..134f9f2
--- /dev/null
+++ b/kernel/irq/migration.c
@@ -0,0 +1,62 @@
+
+#include <linux/irq.h>
+
+void set_pending_irq(unsigned int irq, cpumask_t mask)
+{
+       irq_desc_t *desc = irq_desc + irq;
+       unsigned long flags;
+
+       spin_lock_irqsave(&desc->lock, flags);
+       desc->move_irq = 1;
+       pending_irq_cpumask[irq] = mask;
+       spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+void move_native_irq(int irq)
+{
+       cpumask_t tmp;
+       irq_desc_t *desc = irq_descp(irq);
+
+       if (likely(!desc->move_irq))
+               return;
+
+       /*
+        * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
+        */
+       if (CHECK_IRQ_PER_CPU(desc->status)) {
+               WARN_ON(1);
+               return;
+       }
+
+       desc->move_irq = 0;
+
+       if (likely(cpus_empty(pending_irq_cpumask[irq])))
+               return;
+
+       if (!desc->handler->set_affinity)
+               return;
+
+       assert_spin_locked(&desc->lock);
+
+       cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
+
+       /*
+        * If there was a valid mask to work with, please
+        * do the disable, re-program, enable sequence.
+        * This is *not* particularly important for level triggered
+        * but in a edge trigger case, we might be setting rte
+        * when an active trigger is comming in. This could
+        * cause some ioapics to mal-function.
+        * Being paranoid i guess!
+        */
+       if (unlikely(!cpus_empty(tmp))) {
+               if (likely(!(desc->status & IRQ_DISABLED)))
+                       desc->handler->disable(irq);
+
+               desc->handler->set_affinity(irq,tmp);
+
+               if (likely(!(desc->status & IRQ_DISABLED)))
+                       desc->handler->enable(irq);
+       }
+       cpus_clear(pending_irq_cpumask[irq]);
+}