[tip: irq/core] irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register

[tip: irq/core] irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register

[tip-bot2 for Marek Behún]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     4042a965a5e62c8d298d642cbf72b14f41687319
Gitweb:        https://git.kernel.org/tip/4042a965a5e62c8d298d642cbf72b14f41687319
Author:        Marek Behún <kabel@kernel.org>
AuthorDate:    Wed, 07 Aug 2024 18:41:02 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 08 Aug 2024 17:15:01 +02:00

irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register

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.

Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 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 83afc3a..36d1bac 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -678,7 +678,7 @@ 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.