Merge tag 'irq-urgent-2025-12-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fix from Ingo Molnar:
"Fix IRQ thread affinity flags setup regression"

* tag 'irq-urgent-2025-12-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq: Don't overwrite interrupt thread flags on setup

kernel/irq/manage.c

···
 	 * Ensure the thread adjusts the affinity once it reaches the
 	 * thread function.
 	 */
-	new->thread_flags = BIT(IRQTF_AFFINITY);
+	set_bit(IRQTF_AFFINITY, &new->thread_flags);
 
 	return 0;
 }