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| author | Stuart Yoder <stuart.yoder@freescale.com> | 2011-05-19 08:54:26 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-06-22 21:44:59 -0500 |
| commit | 6ec36b5848a8336d3a0010727b9365c3254d2d2e (patch) | |
| tree | 7876f705354d8b6e73a6079b5bd6561f0b8e2cbd /arch/powerpc/kernel | |
| parent | 47fe819e7555b31d24f8a11d9b2568d8f5de8b01 (diff) | |
| download | linux-6ec36b5848a8336d3a0010727b9365c3254d2d2e.tar.gz linux-6ec36b5848a8336d3a0010727b9365c3254d2d2e.tar.bz2 linux-6ec36b5848a8336d3a0010727b9365c3254d2d2e.zip | |
powerpc: make irq_choose_cpu() available to all PIC drivers
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>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 5b428e308666..38dd10e2841d 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -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) |