Create a new interface and confine it with a config switch which makes
clear that this is just legacy support and not to be used for new code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/irq.h  |    4 ++++
 kernel/irq/Kconfig   |    4 ++++
 kernel/irq/irqdesc.c |    7 +++++++
 3 files changed, 15 insertions(+)

Index: tip/include/linux/irq.h
===================================================================
--- tip.orig/include/linux/irq.h
+++ tip/include/linux/irq.h
@@ -637,6 +637,10 @@ int arch_setup_hwirq(unsigned int irq, i
 void arch_teardown_hwirq(unsigned int irq);
 #endif
 
+#ifdef CONFIG_GENERIC_IRQ_LEGACY
+void irq_init_desc(unsigned int irq);
+#endif
+
 #ifndef irq_reg_writel
 # define irq_reg_writel(val, addr)	writel(val, addr)
 #endif
Index: tip/kernel/irq/Kconfig
===================================================================
--- tip.orig/kernel/irq/Kconfig
+++ tip/kernel/irq/Kconfig
@@ -5,6 +5,10 @@ menu "IRQ subsystem"
 config MAY_HAVE_SPARSE_IRQ
        bool
 
+# Legacy support, required for itanic
+config GENERIC_IRQ_LEGACY
+       bool
+
 # Enable the generic irq autoprobe mechanism
 config GENERIC_IRQ_PROBE
 	bool
Index: tip/kernel/irq/irqdesc.c
===================================================================
--- tip.orig/kernel/irq/irqdesc.c
+++ tip/kernel/irq/irqdesc.c
@@ -306,6 +306,13 @@ void irq_mark_irq(unsigned int irq)
 	mutex_unlock(&sparse_irq_lock);
 }
 
+#ifdef CONFIG_GENERIC_IRQ_LEGACY
+void irq_init_desc(unsigned int irq)
+{
+	dynamic_irq_cleanup(irq);
+}
+#endif
+
 #endif /* !CONFIG_SPARSE_IRQ */
 
 /**


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