linux-kernel - [PATCH v2 3/3] irqchip: Set CPU affinity only on SMP machines for LoongArch

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Date: Tue, 26 Mar 2024 20:11:30 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <maz@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v2 3/3] irqchip: Set CPU affinity only on SMP machines for LoongArch

According to the code comment of "struct irq_chip" in include/linux/irq.h,
the member "irq_set_affinity" is to set the CPU affinity on SMP machines,
so define and call eiointc_set_irq_affinity() only under CONFIG_SMP.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 drivers/irqchip/irq-loongson-eiointc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index b64cbe3052e8..4f5e6d21d77d 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -59,6 +59,7 @@ static int cpu_to_eio_node(int cpu)
 	return cpu_logical_map(cpu) / CORES_PER_EIO_NODE;
 }
 
+#ifdef CONFIG_SMP
 static void eiointc_set_irq_route(int pos, unsigned int cpu, unsigned int mnode, nodemask_t *node_map)
 {
 	int i, node, cpu_node, route_node;
@@ -126,6 +127,7 @@ static int eiointc_set_irq_affinity(struct irq_data *d, const struct cpumask *af
 
 	return IRQ_SET_MASK_OK;
 }
+#endif
 
 static int eiointc_index(int node)
 {
@@ -238,7 +240,9 @@ static struct irq_chip eiointc_irq_chip = {
 	.irq_ack		= eiointc_ack_irq,
 	.irq_mask		= eiointc_mask_irq,
 	.irq_unmask		= eiointc_unmask_irq,
+#ifdef CONFIG_SMP
 	.irq_set_affinity	= eiointc_set_irq_affinity,
+#endif
 };
 
 static int eiointc_domain_alloc(struct irq_domain *domain, unsigned int virq,
-- 
2.42.0