1 files changed, 12 insertions, 0 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 37708d9af638..27cb638f0824 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -243,6 +243,18 @@ static int __init mips_smp_ipi_init(void)
         struct irq_domain *ipidomain;
         struct device_node *node;
 
+        /*
+         * In some cases like qemu-malta, it is desired to try SMP with
+         * a single core. Qemu-malta has no GIC, so an attempt to set any IPIs
+         * would cause a BUG_ON() to be triggered since there's no ipidomain.
+         *
+         * Since for a single core system IPIs aren't required really, skip the
+         * initialisation which should generally keep any such configurations
+         * happy and only fail hard when trying to truely run SMP.
+         */
+        if (cpumask_weight(cpu_possible_mask) == 1)
+                return 0;
+
         node = of_irq_find_parent(of_root);
         ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);