This is a note to let you know that I've just added the patch titled
genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
genirq-adjust-irq-thread-affinity-on-irq_set_mask_ok_nocopy-return-value.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f5cb92ac82d06cb583c1f66666314c5c0a4d7913 Mon Sep 17 00:00:00 2001
From: Jiang Liu <[email protected]>
Date: Fri, 30 Mar 2012 23:11:33 +0800
Subject: genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return
value
From: Jiang Liu <[email protected]>
commit f5cb92ac82d06cb583c1f66666314c5c0a4d7913 upstream.
irq_move_masked_irq() checks the return code of
chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is
also a valid return code, which is there to avoid a redundant copy of
the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid
the redundant copy, we also fail to adjust the thread affinity of an
eventually threaded interrupt handler.
Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return
values correctly by checking the valid return values seperately.
Signed-off-by: Jiang Liu <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Keping Chen <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/irq/migration.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -43,12 +43,16 @@ void irq_move_masked_irq(struct irq_data
* masking the irqs.
*/
if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
- < nr_cpu_ids))
- if (!chip->irq_set_affinity(&desc->irq_data,
- desc->pending_mask, false)) {
+ < nr_cpu_ids)) {
+ int ret = chip->irq_set_affinity(&desc->irq_data,
+ desc->pending_mask, false);
+ switch (ret) {
+ case IRQ_SET_MASK_OK:
cpumask_copy(desc->irq_data.affinity,
desc->pending_mask);
+ case IRQ_SET_MASK_OK_NOCOPY:
irq_set_thread_affinity(desc);
}
+ }
cpumask_clear(desc->pending_mask);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/genirq-adjust-irq-thread-affinity-on-irq_set_mask_ok_nocopy-return-value.patch
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