Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block
[linux-2.6] / kernel / irq / migration.c
1 #include <linux/irq.h>
2
3 #if defined(CONFIG_GENERIC_PENDING_IRQ)
4
5 void set_pending_irq(unsigned int irq, cpumask_t mask)
6 {
7         irq_desc_t *desc = irq_desc + irq;
8         unsigned long flags;
9
10         spin_lock_irqsave(&desc->lock, flags);
11         desc->move_irq = 1;
12         pending_irq_cpumask[irq] = mask;
13         spin_unlock_irqrestore(&desc->lock, flags);
14 }
15
16 void move_native_irq(int irq)
17 {
18         cpumask_t tmp;
19         irq_desc_t *desc = irq_descp(irq);
20
21         if (likely(!desc->move_irq))
22                 return;
23
24         /*
25          * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
26          */
27         if (CHECK_IRQ_PER_CPU(desc->status)) {
28                 WARN_ON(1);
29                 return;
30         }
31
32         desc->move_irq = 0;
33
34         if (likely(cpus_empty(pending_irq_cpumask[irq])))
35                 return;
36
37         if (!desc->handler->set_affinity)
38                 return;
39
40         assert_spin_locked(&desc->lock);
41
42         cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
43
44         /*
45          * If there was a valid mask to work with, please
46          * do the disable, re-program, enable sequence.
47          * This is *not* particularly important for level triggered
48          * but in a edge trigger case, we might be setting rte
49          * when an active trigger is comming in. This could
50          * cause some ioapics to mal-function.
51          * Being paranoid i guess!
52          */
53         if (unlikely(!cpus_empty(tmp))) {
54                 if (likely(!(desc->status & IRQ_DISABLED)))
55                         desc->handler->disable(irq);
56
57                 desc->handler->set_affinity(irq,tmp);
58
59                 if (likely(!(desc->status & IRQ_DISABLED)))
60                         desc->handler->enable(irq);
61         }
62         cpus_clear(pending_irq_cpumask[irq]);
63 }
64
65 #endif