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powerpc: make irq_choose_cpu() available to all PIC drivers

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Move irq_choose_cpu() into arch/powerpc/kernel/irq.c so that it can be used
by other PIC drivers.  The function is not MPIC-specific.

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Stuart Yoder
2011-05-19 08:54:26 -05:00
committed by Kumar Gala
parent 47fe819e75
commit 6ec36b5848
3 changed files with 37 additions and 36 deletions
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35
arch/powerpc/kernel/irq.c
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@@ -882,6 +882,41 @@ unsigned int irq_find_mapping(struct irq_host *host,
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
#ifdef CONFIG_SMP
int irq_choose_cpu(const struct cpumask *mask)
{
int cpuid;
if (cpumask_equal(mask, cpu_all_mask)) {
static int irq_rover;
static DEFINE_RAW_SPINLOCK(irq_rover_lock);
unsigned long flags;
/* Round-robin distribution... */
do_round_robin:
raw_spin_lock_irqsave(&irq_rover_lock, flags);
irq_rover = cpumask_next(irq_rover, cpu_online_mask);
if (irq_rover >= nr_cpu_ids)
irq_rover = cpumask_first(cpu_online_mask);
cpuid = irq_rover;
raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
} else {
cpuid = cpumask_first_and(mask, cpu_online_mask);
if (cpuid >= nr_cpu_ids)
goto do_round_robin;
}
return get_hard_smp_processor_id(cpuid);
}
#else
int irq_choose_cpu(const struct cpumask *mask)
{
return hard_smp_processor_id();
}
#endif
unsigned int irq_radix_revmap_lookup(struct irq_host *host,
irq_hw_number_t hwirq)