diff options
| -rw-r--r-- | include/linux/irq.h | 11 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 2 | ||||
| -rw-r--r-- | kernel/irq/proc.c | 4 |
3 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index f04ba20712a2..60f8bc78a35a 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -221,6 +221,17 @@ extern void note_interrupt(unsigned int irq, irq_desc_t *desc, extern int can_request_irq(unsigned int irq, unsigned long irqflags); extern void init_irq_proc(void); + +#ifdef CONFIG_AUTO_IRQ_AFFINITY +extern int select_smp_affinity(unsigned int irq); +#else +static inline int +select_smp_affinity(unsigned int irq) +{ + return 1; +} +#endif + #endif extern hw_irq_controller no_irq_type; /* needed in every arch ? */ diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 81c49a4d679e..97d5559997d2 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -366,6 +366,8 @@ int request_irq(unsigned int irq, action->next = NULL; action->dev_id = dev_id; + select_smp_affinity(irq); + retval = setup_irq(irq, action); if (retval) kfree(action); diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index f26e534c6585..8a64a4844cde 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -68,7 +68,9 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer, */ cpus_and(tmp, new_value, cpu_online_map); if (cpus_empty(tmp)) - return -EINVAL; + /* Special case for empty set - allow the architecture + code to set default SMP affinity. */ + return select_smp_affinity(irq) ? -EINVAL : full_count; proc_set_irq_affinity(irq, new_value); |