Commit 96d97cf0 authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

x86: add /proc/irq/*/spurious to dump the spurious irq debugging state 



This is useful to debug problems with interrupt handlers that return
sometimes IRQ_NONE.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 9e094c17

kernel/irq/proc.c

+19 −2
Original line number Diff line number Diff line
@@ -75,6 +75,18 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer, 


#endif



static int irq_spurious_read(char *page, char **start, off_t off,

				  int count, int *eof, void *data)

{

	struct irq_desc *d = &irq_desc[(long) data];

	return sprintf(page, "count %u\n"

			     "unhandled %u\n"

			     "last_unhandled %u ms\n",

			d->irq_count,

			d->irqs_unhandled,

			jiffies_to_msecs(d->last_unhandled));

}



#define MAX_NAMELEN 128



static int name_unique(unsigned int irq, struct irqaction *new_action)
@@ -118,6 +130,7 @@ void register_handler_proc(unsigned int irq, struct irqaction *action) 
void register_irq_proc(unsigned int irq)

{

	char name [MAX_NAMELEN];

	struct proc_dir_entry *entry;



	if (!root_irq_dir ||

		(irq_desc[irq].chip == &no_irq_chip) ||
@@ -132,8 +145,6 @@ void register_irq_proc(unsigned int irq) 


#ifdef CONFIG_SMP

	{

		struct proc_dir_entry *entry;



		/* create /proc/irq/<irq>/smp_affinity */

		entry = create_proc_entry("smp_affinity", 0600, irq_desc[irq].dir);
@@ -144,6 +155,12 @@ void register_irq_proc(unsigned int irq) 
		}

	}

#endif



	entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir);

	if (entry) {

		entry->data = (void *)(long)irq;

		entry->read_proc = irq_spurious_read;

	}

}



#undef MAX_NAMELEN