[PATCH 11/13] irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register

[Marek Behún]

Use MPIC_PER_CPU_IRQS_NR (29) bound instead of BITS_PER_LONG (32) when
iterating the bits of the per-CPU interrupt cause register, since there
are only 29 per-CPU interrupts. The top 3 bits are always zero anyway,
so this may save a couple of cycles in the interrupt handler.

Signed-off-by: Marek Behún <kabel at kernel.org>
---
 drivers/irqchip/irq-armada-370-xp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 78d9c7699972..1db9160da20a 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -683,7 +683,7 @@ static void mpic_handle_cascade_irq(struct irq_desc *desc)
 	cause = readl_relaxed(mpic->per_cpu + MPIC_PPI_CAUSE);
 	cpuid = cpu_logical_map(smp_processor_id());
 
-	for_each_set_bit(i, &cause, BITS_PER_LONG) {
+	for_each_set_bit(i, &cause, MPIC_PER_CPU_IRQS_NR) {
 		irqsrc = readl_relaxed(mpic->base + MPIC_INT_SOURCE_CTL(i));
 
 		/* Check if the interrupt is not masked on current CPU.
-- 
2.44.2