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authorThomas Gleixner <tglx@linutronix.de>2009-07-21 11:09:39 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-07-21 14:35:07 +0200
commit591d2fb02ea80472d846c0b8507007806bdd69cc (patch)
treec7962a95a47bbdf664f15a504eff24c351f33613 /include
parentaea1f7964ae6cba5eb419a958956deb9016b3341 (diff)
genirq: Delegate irq affinity setting to the irq thread
irq_set_thread_affinity() calls set_cpus_allowed_ptr() which might sleep, but irq_set_thread_affinity() is called with desc->lock held and can be called from hard interrupt context as well. The code has another bug as it does not hold a ref on the task struct as required by set_cpus_allowed_ptr(). Just set the IRQTF_AFFINITY bit in action->thread_flags. The next time the thread runs it migrates itself. Solves all of the above problems nicely. Add kerneldoc to irq_set_thread_affinity() while at it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <new-submission>
Diffstat (limited to 'include')
-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 2721f07e935..88b056ac562 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -64,11 +64,13 @@
* IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
* IRQTF_DIED - handler thread died
* IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
+ * IRQTF_AFFINITY - irq thread is requested to adjust affinity
*/
enum {
IRQTF_RUNTHREAD,
IRQTF_DIED,
IRQTF_WARNED,
+ IRQTF_AFFINITY,
};
typedef irqreturn_t (*irq_handler_t)(int, void *);