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genirq: Implement sane enumeration

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Use the allocator bitmap to lookup active interrupts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2010-09-30 10:45:07 +02:00
parent 13bfe99e09
commit a98d24b71b
2 changed files with 16 additions and 0 deletions
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5
include/linux/irqnr.h
View file

@ -25,6 +25,7 @@
extern int nr_irqs;
extern struct irq_desc *irq_to_desc(unsigned int irq);
unsigned int irq_get_next_irq(unsigned int offset);
# define for_each_irq_desc(irq, desc) \
for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs; \
@ -47,6 +48,10 @@ extern struct irq_desc *irq_to_desc(unsigned int irq);
#define irq_node(irq) 0
#endif
# define for_each_active_irq(irq) \
for (irq = irq_get_next_irq(0); irq < nr_irqs; \
irq = irq_get_next_irq(irq + 1))
#endif /* CONFIG_GENERIC_HARDIRQS */
#define for_each_irq_nr(irq) \

11
kernel/irq/irqdesc.c
View file

@ -463,6 +463,17 @@ err:
return ret;
}
/**
* irq_get_next_irq - get next allocated irq number
* @offset: where to start the search
*
* Returns next irq number after offset or nr_irqs if none is found.
*/
unsigned int irq_get_next_irq(unsigned int offset)
{
return find_next_bit(allocated_irqs, nr_irqs, offset);
}
/* Statistics access */
void clear_kstat_irqs(struct irq_desc *desc)
{