x86, irq: Move irq_remapping_enabled declaration to iommu code

Remove the last left-over from this flag from x86 code.
Signed-off-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/include/asm/irq_remapping.h

@@ -26,8 +26,6 @@
 
 #ifdef CONFIG_IRQ_REMAP
 
-extern int irq_remapping_enabled;
-
 extern void setup_irq_remapping_ops(void);
 extern int irq_remapping_supported(void);
 extern int irq_remapping_prepare(void);
@@ -49,8 +47,6 @@ extern void panic_if_irq_remap(const char *msg);
 
 #else  /* CONFIG_IRQ_REMAP */
 
-#define irq_remapping_enabled	0
-
 static inline void setup_irq_remapping_ops(void) { }
 static inline int irq_remapping_supported(void) { return 0; }
 static inline int irq_remapping_prepare(void) { return -ENODEV; }

drivers/iommu/dmar.c

@@ -41,6 +41,8 @@
 #include <asm/irq_remapping.h>
 #include <asm/iommu_table.h>
 
+#include "irq_remapping.h"
+
 /* No locks are needed as DMA remapping hardware unit
  * list is constructed at boot time and hotplug of
  * these units are not supported by the architecture.

drivers/iommu/intel-iommu.c

@@ -46,6 +46,8 @@
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
 
+#include "irq_remapping.h"
+
 #define ROOT_SIZE		VTD_PAGE_SIZE
 #define CONTEXT_SIZE		VTD_PAGE_SIZE
 

drivers/iommu/irq_remapping.h

@@ -34,6 +34,7 @@ struct msi_msg;
 extern int disable_irq_remap;
 extern int disable_sourceid_checking;
 extern int no_x2apic_optout;
+extern int irq_remapping_enabled;
 
 struct irq_remap_ops {
 	/* Check whether Interrupt Remapping is supported */