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authorThomas Gleixner <tglx@linutronix.de>2011-02-23 23:52:13 +0000
committerThomas Gleixner <tglx@linutronix.de>2011-02-25 20:24:21 +0100
commitb5faba21a6805c33b40e258d36f57997ee1de131 (patch)
treec84ef3357ecd6e1b1cfda623136529db0e5fab6f /include/linux/interrupt.h
parent1204e95689f9fbd245a4ce5c1b0cd0a9b77f8d25 (diff)
genirq: Prepare the handling of shared oneshot interrupts
For level type interrupts we need to track how many threads are on flight to avoid useless interrupt storms when not all thread handlers have finished yet. Keep track of the woken threads and only unmask when there are no more threads in flight. Yes, I'm lazy and using a bitfield. But not only because I'm lazy, the main reason is that it's way simpler than using a refcount. A refcount based solution would need to keep track of various things like crashing the irq thread, spurious interrupts coming in, disables/enables, free_irq() and some more. The bitfield keeps the tracking simple and makes things just work. It's also nicely confined to the thread code pathes and does not require additional checks all over the place. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20110223234956.388095876@linutronix.de>
Diffstat (limited to 'include/linux/interrupt.h')
-rw-r--r--include/linux/interrupt.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 8da6643e39a6..e116fef274cd 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -99,6 +99,7 @@ typedef irqreturn_t (*irq_handler_t)(int, void *);
* @thread_fn: interupt handler function for threaded interrupts
* @thread: thread pointer for threaded interrupts
* @thread_flags: flags related to @thread
+ * @thread_mask: bitmask for keeping track of @thread activity
*/
struct irqaction {
irq_handler_t handler;
@@ -109,6 +110,7 @@ struct irqaction {
irq_handler_t thread_fn;
struct task_struct *thread;
unsigned long thread_flags;
+ unsigned long thread_mask;
const char *name;
struct proc_dir_entry *dir;
} ____cacheline_internodealigned_in_smp;