diff options
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 4c69326aa77..e49a288fa47 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -616,6 +616,22 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, return ret; } +#ifdef CONFIG_HARDIRQS_SW_RESEND +int irq_set_parent(int irq, int parent_irq) +{ + unsigned long flags; + struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0); + + if (!desc) + return -EINVAL; + + desc->parent_irq = parent_irq; + + irq_put_desc_unlock(desc, flags); + return 0; +} +#endif + /* * Default primary interrupt handler for threaded interrupts. Is * assigned as primary handler when request_threaded_irq is called @@ -716,6 +732,7 @@ static void irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) { cpumask_var_t mask; + bool valid = true; if (!test_and_clear_bit(IRQTF_AFFINITY, &action->thread_flags)) return; @@ -730,10 +747,18 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action) } raw_spin_lock_irq(&desc->lock); - cpumask_copy(mask, desc->irq_data.affinity); + /* + * This code is triggered unconditionally. Check the affinity + * mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out. + */ + if (desc->irq_data.affinity) + cpumask_copy(mask, desc->irq_data.affinity); + else + valid = false; raw_spin_unlock_irq(&desc->lock); - set_cpus_allowed_ptr(current, mask); + if (valid) + set_cpus_allowed_ptr(current, mask); free_cpumask_var(mask); } #else @@ -793,7 +818,7 @@ static void irq_thread_dtor(struct callback_head *unused) action = kthread_data(tsk); pr_err("exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", - tsk->comm ? tsk->comm : "", tsk->pid, action->irq); + tsk->comm, tsk->pid, action->irq); desc = irq_to_desc(action->irq); @@ -833,6 +858,8 @@ static int irq_thread(void *data) init_task_work(&on_exit_work, irq_thread_dtor); task_work_add(current, &on_exit_work, false); + irq_thread_check_affinity(desc, action); + while (!irq_wait_for_interrupt(action)) { irqreturn_t action_ret; @@ -936,6 +963,16 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) */ get_task_struct(t); new->thread = t; + /* + * Tell the thread to set its affinity. This is + * important for shared interrupt handlers as we do + * not invoke setup_affinity() for the secondary + * handlers as everything is already set up. Even for + * interrupts marked with IRQF_NO_BALANCE this is + * correct as we want the thread to move to the cpu(s) + * on which the requesting code placed the interrupt. + */ + set_bit(IRQTF_AFFINITY, &new->thread_flags); } if (!alloc_cpumask_var(&mask, GFP_KERNEL)) { |