cpumask: make irq_set_affinity() take a const struct cpumask
[linux-2.6.git] / kernel / irq / migration.c
1
2 #include <linux/irq.h>
3
4 void move_masked_irq(int irq)
5 {
6         struct irq_desc *desc = irq_to_desc(irq);
7
8         if (likely(!(desc->status & IRQ_MOVE_PENDING)))
9                 return;
10
11         /*
12          * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
13          */
14         if (CHECK_IRQ_PER_CPU(desc->status)) {
15                 WARN_ON(1);
16                 return;
17         }
18
19         desc->status &= ~IRQ_MOVE_PENDING;
20
21         if (unlikely(cpumask_empty(&desc->pending_mask)))
22                 return;
23
24         if (!desc->chip->set_affinity)
25                 return;
26
27         assert_spin_locked(&desc->lock);
28
29         /*
30          * If there was a valid mask to work with, please
31          * do the disable, re-program, enable sequence.
32          * This is *not* particularly important for level triggered
33          * but in a edge trigger case, we might be setting rte
34          * when an active trigger is comming in. This could
35          * cause some ioapics to mal-function.
36          * Being paranoid i guess!
37          *
38          * For correct operation this depends on the caller
39          * masking the irqs.
40          */
41         if (likely(cpumask_any_and(&desc->pending_mask, cpu_online_mask)
42                    < nr_cpu_ids)) {
43                 cpumask_and(&desc->affinity,
44                             &desc->pending_mask, cpu_online_mask);
45                 desc->chip->set_affinity(irq, &desc->affinity);
46         }
47         cpumask_clear(&desc->pending_mask);
48 }
49
50 void move_native_irq(int irq)
51 {
52         struct irq_desc *desc = irq_to_desc(irq);
53
54         if (likely(!(desc->status & IRQ_MOVE_PENDING)))
55                 return;
56
57         if (unlikely(desc->status & IRQ_DISABLED))
58                 return;
59
60         desc->chip->mask(irq);
61         move_masked_irq(irq);
62         desc->chip->unmask(irq);
63 }
64