[PATCH] [RFC]ARM:Let GIC to route IRQs to any allowed CPUs

The current logic will always route IRQs to the first allowed CPU
Following two commands have the same result (all IRQs to CPU0)
cmd1: $ echo 3 > proc/irq/xxx/smp_affinity
cmd2: $ echo 1 > proc/irq/xxx/smp_affinity
While below command will route all IRQs to CPU1
cmd3: $ echo 2 > proc/irq/xxx/smp_affinity

With this patch, cmd1 will route IRQs to both CPU0 and CPU1
Meanwhile, cmd2 and cmd3 will work as before

Change-Id: Ife8e466ded7c18b4b050a4bc64b62346c063a93b
Signed-off-by: Tao Hu <redacted>
---
 arch/arm/common/gic.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index bceb9cb..4904988 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c

@@ -105,7 +105,11 @@ static int gic_set_cpu(unsigned int irq, const

struct cpumask *mask_val)
 	spin_lock(&irq_controller_lock);
 	irq_desc[irq].node = cpu;
 	val = readl(reg) & ~(0xff << shift);
-	val |= 1 << (cpu + shift);
+	do {
+		val |= 1 << (cpu + shift);
+		cpu = cpumask_next(cpu, mask_val);
+	} while (cpu < nr_cpu_ids);
+
 	writel(val, reg);
 	spin_unlock(&irq_controller_lock);

-- 
1.7.1