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authorSrinivas Ramana <sramana@codeaurora.org>2018-12-20 19:05:57 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-05 17:58:47 +0100
commit17fab8914f8650f9d815919c14228915e02558a2 (patch)
tree888f6263bbc8c9140819a5432f81598775f4d189 /kernel
parent7746dd64c2c9e08c60e2cf735b1bc2c9e227ea0d (diff)
genirq: Make sure the initial affinity is not empty
[ Upstream commit bddda606ec76550dd63592e32a6e87e7d32583f7 ] If all CPUs in the irq_default_affinity mask are offline when an interrupt is initialized then irq_setup_affinity() can set an empty affinity mask for a newly allocated interrupt. Fix this by falling back to cpu_online_mask in case the resulting affinity mask is zero. Signed-off-by: Srinivas Ramana <sramana@codeaurora.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arm-msm@vger.kernel.org Link: https://lkml.kernel.org/r/1545312957-8504-1-git-send-email-sramana@codeaurora.org Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/manage.c3
1 files changed, 3 insertions, 0 deletions
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);