From: Helge Deller Date: Fri, 4 Jan 2019 23:05:46 +0000 (+0100) Subject: parisc: Improve initial IRQ to CPU assignment X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978;p=linux.git 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 --- diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index 6f19f364c20ab..23040a67583e4 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -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; }