Commit cbf86999 authored Feb 16, 2018 by Thomas Gleixner

genirq: Let irq thread follow the effective hard irq affinity

In case of threaded interrupts the thread follows the affinity setting of
the hard interrupt. The related function uses the affinity mask which was
set by either from user space or via one of the kernel mechanisms. This
mask can be wider than the resulting effective affinity of the hard
interrupt. As a consequence the thread might become affine to a completely
different CPU.

Use the effective interrupt affinity if the architecture supports it, so
the hard interrupt and the thread stay on the same CPU.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

parent 7928b2cb

kernel/irq/manage.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -855,10 +855,14 @@ irq_thread_check_affinity(struct irq_desc desc, struct irqaction action)
		* This code is triggered unconditionally. Check the affinity
		* mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
		*/
		if (cpumask_available(desc->irq_common_data.affinity))
		cpumask_copy(mask, desc->irq_common_data.affinity);
		else
		if (cpumask_available(desc->irq_common_data.affinity)) {
		const struct cpumask *m;

		m = irq_data_get_effective_affinity_mask(&desc->irq_data);
		cpumask_copy(mask, m);
		} else {
		valid = false;
		}
		raw_spin_unlock_irq(&desc->lock);

		if (valid)