genirq: Update affinity of secondary threads

For interrupts with secondary threads, the affinity is applied when the
thread is created but if the interrupts affinity is changed later only
the primary thread is updated.

Update the secondary thread's affinity as well to keep all the interrupts
activity on the assigned CPUs.

Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230406180857.588682-1-john@metanate.com

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 8ce75495e04f137ec48f8259d2b3444a3e1c8281..d2742af0f0fd870124c8fa189c102e8f330ff4d9 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -189,9 +189,12 @@ void irq_set_thread_affinity(struct irq_desc *desc)
 {
        struct irqaction *action;
 
-       for_each_action_of_desc(desc, action)
+       for_each_action_of_desc(desc, action) {
                if (action->thread)
                        set_bit(IRQTF_AFFINITY, &action->thread_flags);
+               if (action->secondary && action->secondary->thread)
+                       set_bit(IRQTF_AFFINITY, &action->secondary->thread_flags);
+       }
 }
 
 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK