Only backport irq_get_trigger_type on architectures that have
CONFIG_HAVE_GENERIC_HARDIRQS=y. Otherwise we end up with:

In file included from drivers/pci/msi.c:11:0:
backport/backport-include/linux/irq.h: In function 'irq_get_trigger_type':
backport/backport-include/linux/irq.h:9:9: error: implicit declaration
of function 'irq_get_irq_data' [-Werror=implicit-function-declaration]
  struct irq_data *d = irq_get_irq_data(irq);

Signed-off-by: Stefan Assmann <[email protected]>
---
 backport/backport-include/linux/irq.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/backport/backport-include/linux/irq.h 
b/backport/backport-include/linux/irq.h
index 1738e9b..29b543b 100644
--- a/backport/backport-include/linux/irq.h
+++ b/backport/backport-include/linux/irq.h
@@ -2,6 +2,7 @@
 #define __BACKPORT_LINUX_IRQ_H
 #include_next <linux/irq.h>
 
+#ifdef CONFIG_HAVE_GENERIC_HARDIRQS
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)
 #define irq_get_trigger_type LINUX_BACKPORT(irq_get_trigger_type)
 static inline u32 irq_get_trigger_type(unsigned int irq)
@@ -10,5 +11,6 @@ static inline u32 irq_get_trigger_type(unsigned int irq)
        return d ? irqd_get_trigger_type(d) : 0;
 }
 #endif
+#endif /* CONFIG_HAVE_GENERIC_HARDIRQS */
 
 #endif /* __BACKPORT_LINUX_IRQ_H */
-- 
1.9.3

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