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parisc: Improve initial IRQ to CPU assignment 

On parisc, each IRQ can only be handled by one CPU, and currently CPU0
is choosen as default for handling all IRQs by default.
With this patch we now assign each requested IRQ to one of the online
CPUs (and thus distribute the IRQs across all CPUs), even without an
instance of irqbalance running.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2019-01-05 00:05:46 +01:00
parent b102f29b2d
commit f73493eb4a
1 changed files with 4 additions and 1 deletions
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5
arch/parisc/kernel/irq.c
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@ -117,7 +117,10 @@ int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest)
return -EINVAL;
/* whatever mask they set, we just allow one CPU */
cpu_dest = cpumask_first_and(dest, cpu_online_mask);
cpu_dest = cpumask_next_and(d->irq & (num_online_cpus()-1),
dest, cpu_online_mask);
if (cpu_dest >= nr_cpu_ids)
cpu_dest = cpumask_first_and(dest, cpu_online_mask);
return cpu_dest;
}