[lkml]   [2018]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH] genirq: Make sure the affinity to be set is not empty
If the default_affinity is managed/initialized by a system and
all the cpus present in irq_default_affinity are hotplugged out
we may end up passing a cpumask of 0 to irq_do_set_affinity().

Fix this by falling back to cpu_online_mask in case the
calculated affinity becomes zero.

Signed-off-by: Srinivas Ramana <>
kernel/irq/manage.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 9dbdccab3b6a..5c0ba5ca5930 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -393,6 +393,9 @@ int irq_setup_affinity(struct irq_desc *desc)

cpumask_and(&mask, cpu_online_mask, set);
+ if (cpumask_empty(&mask))
+ cpumask_copy(&mask, cpu_online_mask);
if (node != NUMA_NO_NODE) {
const struct cpumask *nodemask = cpumask_of_node(node);

Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.,
is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
 \ /
  Last update: 2018-12-20 14:36    [W:0.042 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site