Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=96d97cf03b3d68e6c857623da93acd522b2b7e1a
Commit: 96d97cf03b3d68e6c857623da93acd522b2b7e1a
Parent: 9e094c17ee2b85130ab7b2ea37456f6867eb687a
Author: Andi Kleen <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:32:48 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:32:48 2008 +0100
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: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
kernel/irq/proc.c | 21 +++++++++++++++++++--
1 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 50b81b9..c2f2ccb 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -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
-
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