Sometimes it is necessary to fix interrupt affinity to an offline CPU, for example in initialization of local timers. This patch modifies .set_affinity() operation of irq-gic driver to fall back to any possible CPU if no online CPU can be found in requested CPU mask. This fixes broken Exynos4210 support since commit ee98d27df6 ARM: EXYNOS4: Divorce mct from local timer API caused by timer initialization code unable to set affinity for local timer interrupts. Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> --- drivers/irqchip/irq-gic.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index ee7c503..5f0797e 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -250,6 +250,15 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask); u32 val, mask, bit; + /* + * If no online CPU could be found, fall back to any possible CPU. + * + * This is to allow setting affinity of some interrupts to a CPU + * before it is marked as online, i.e. local timer initialization. + */ + if (cpu >= nr_cpu_ids) + cpu = cpumask_any_and(mask_val, cpu_possible_mask); + if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids) return -EINVAL; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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