[PATCH 3/5] xen: arm: Add DT_NR_GIC_INTERRUPT_CELLS rather than hardcoding 3

[Ian Campbell <ian.campbell@citrix.com>]

I'm going to need this elsewhere and would prefer to avoid writing 3 again.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---
 xen/arch/arm/domain_build.c |    2 +-
 xen/arch/arm/gic.c          |    2 +-
 xen/include/asm-arm/gic.h   |    2 ++
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index de180d8..998b6fd 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -500,7 +500,7 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo,
  * This code is assuming the irq is an PPI.
  */
 
-typedef __be32 gic_interrupt_t[3];
+typedef __be32 gic_interrupt_t[DT_NR_GIC_INTERRUPT_CELLS];
 
 static void set_interrupt_ppi(gic_interrupt_t interrupt, unsigned int irq,
                               unsigned int cpumask, unsigned int level)
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 70d10d6..148f555 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -147,7 +147,7 @@ int gic_irq_xlate(const u32 *intspec, unsigned int intsize,
                   unsigned int *out_hwirq,
                   unsigned int *out_type)
 {
-    if ( intsize < 3 )
+    if ( intsize < DT_NR_GIC_INTERRUPT_CELLS )
         return -EINVAL;
 
     /* Get the interrupt number and add 16 to skip over SGIs */
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 187dc46..d697dd9 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -22,6 +22,8 @@
 #define NR_GIC_SGI         16
 #define MAX_RDIST_COUNT    4
 
+#define DT_NR_GIC_INTERRUPT_CELLS 3
+
 #define GICD_CTLR       (0x000)
 #define GICD_TYPER      (0x004)
 #define GICD_IIDR       (0x008)
-- 
1.7.10.4