[PATCH 1/2] x86/dtb: make irq host list accessible

[Sebastian Andrzej Siewior]

From: Torben Hohn <torbenh@xxxxxxxxxxxxx>

There is an gpio irq chip comming which needs this from the outside.
There is no EXPORT_SYMBOL because this does not yet work in modules.

Signed-off-by: Torben Hohn <torbenh@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 arch/x86/include/asm/irq_controller.h |    2 ++
 arch/x86/kernel/devicetree.c          |   15 +++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/irq_controller.h b/arch/x86/include/asm/irq_controller.h
index 423bbbd..04fecc0 100644
--- a/arch/x86/include/asm/irq_controller.h
+++ b/arch/x86/include/asm/irq_controller.h
@@ -9,4 +9,6 @@ struct irq_domain {
 	struct list_head l;
 };
 
+extern void irq_add_of_interrupt_host(struct irq_domain *ih);
+extern void irq_remove_of_interrupt_host(struct irq_domain *ih);
 #endif
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index e90f084..58c4208 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -26,8 +26,7 @@ static DEFINE_RAW_SPINLOCK(big_irq_lock);
 
 int __initdata of_ioapic;
 
-#ifdef CONFIG_X86_IO_APIC
-static void add_interrupt_host(struct irq_domain *ih)
+void irq_add_of_interrupt_host(struct irq_domain *ih)
 {
 	unsigned long flags;
 
@@ -35,7 +34,15 @@ static void add_interrupt_host(struct irq_domain *ih)
 	list_add(&ih->l, &irq_domains);
 	raw_spin_unlock_irqrestore(&big_irq_lock, flags);
 }
-#endif
+
+void irq_remove_of_interrupt_host(struct irq_domain *ih)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&big_irq_lock, flags);
+	list_del(&ih->l);
+	raw_spin_unlock_irqrestore(&big_irq_lock, flags);
+}
 
 static struct irq_domain *get_ih_from_node(struct device_node *controller)
 {
@@ -415,7 +422,7 @@ static void __init ioapic_add_ofnode(struct device_node *np)
 			id->controller = np;
 			id->xlate = ioapic_xlate;
 			id->priv = (void *)i;
-			add_interrupt_host(id);
+			irq_add_of_interrupt_host(id);
 			return;
 		}
 	}
-- 
1.7.4.4

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