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authorThomas Gleixner <tglx@linutronix.de>2018-02-16 15:21:20 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-02-16 15:28:50 +0100
commitcbf8699996a6e7f2f674b3a2a4cef9f666ff613e (patch)
treebd662d2061f90832d1bc26e47033f00d13585901 /kernel/irq/manage.c
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
downloadlinux-stericsson-cbf8699996a6e7f2f674b3a2a4cef9f666ff613e.tar.gz
genirq: Let irq thread follow the effective hard irq affinity
In case of threaded interrupts the thread follows the affinity setting of the hard interrupt. The related function uses the affinity mask which was set by either from user space or via one of the kernel mechanisms. This mask can be wider than the resulting effective affinity of the hard interrupt. As a consequence the thread might become affine to a completely different CPU. Use the effective interrupt affinity if the architecture supports it, so the hard interrupt and the thread stay on the same CPU. Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'kernel/irq/manage.c')
-rw-r--r--kernel/irq/manage.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0f922729bab9..d2b3c59f1200 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -855,10 +855,14 @@ irq_thread_check_affinity(struct irq_desc *desc, struct irqaction *action)
* This code is triggered unconditionally. Check the affinity
* mask pointer. For CPU_MASK_OFFSTACK=n this is optimized out.
*/
- if (cpumask_available(desc->irq_common_data.affinity))
- cpumask_copy(mask, desc->irq_common_data.affinity);
- else
+ if (cpumask_available(desc->irq_common_data.affinity)) {
+ const struct cpumask *m;
+
+ m = irq_data_get_effective_affinity_mask(&desc->irq_data);
+ cpumask_copy(mask, m);
+ } else {
valid = false;
+ }
raw_spin_unlock_irq(&desc->lock);
if (valid)