add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/irqchip/irq-i8259.c
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@@ -225,14 +225,6 @@
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 	.shutdown = i8259A_shutdown,
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 };
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-static int __init i8259A_init_sysfs(void)
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-{
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-	register_syscore_ops(&i8259_syscore_ops);
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-	return 0;
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-}
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-
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-device_initcall(i8259A_init_sysfs);
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-
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 static void init_8259A(int auto_eoi)
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 {
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 	unsigned long flags;
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@@ -276,15 +268,6 @@
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 	raw_spin_unlock_irqrestore(&i8259A_lock, flags);
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 }
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-/*
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- * IRQ2 is cascade interrupt to second interrupt controller
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- */
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-static struct irqaction irq2 = {
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-	.handler = no_action,
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-	.name = "cascade",
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-	.flags = IRQF_NO_THREAD,
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-};
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-
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 static struct resource pic1_io_resource = {
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 	.name = "pic1",
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 	.start = PIC_MASTER_CMD,
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@@ -319,6 +302,10 @@
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  */
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 struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
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 {
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+	/*
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+	 * PIC_CASCADE_IR is cascade interrupt to second interrupt controller
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+	 */
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+	int irq = I8259A_IRQ_BASE + PIC_CASCADE_IR;
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 	struct irq_domain *domain;
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 	insert_resource(&ioport_resource, &pic1_io_resource);
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@@ -331,7 +318,9 @@
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 	if (!domain)
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 		panic("Failed to add i8259 IRQ domain");
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-	setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
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+	if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
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+		pr_err("Failed to register cascade interrupt\n");
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+	register_syscore_ops(&i8259_syscore_ops);
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 	return domain;
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 }
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