[RFC PATCH 2/3] ARM: gic: allow irq_start to be 0

[Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>

There's really no need to set irq_start per platform for the primary gic.
The SGIs and PPIs are not handled as normal irqs, so how irqs 0-31 are
setup doesn't really matter. So allow irq_start to be set to 0 to match
the linux irq numbering.

Signed-off-by: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
---
 arch/arm/common/gic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 3227ca9..f13298e 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -353,7 +353,7 @@ void __init gic_init(unsigned int gic_nr, unsigned int irq_start,
 	gic = &gic_data[gic_nr];
 	gic->dist_base = dist_base;
 	gic->cpu_base = cpu_base;
-	gic->irq_offset = (irq_start - 1) & ~31;
+	gic->irq_offset = irq_start ? (irq_start - 1) & ~31 : 0;
 
 	if (gic_nr == 0)
 		gic_cpu_base_addr = cpu_base;
-- 
1.7.4.1