Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index 54f8a33..37671a5 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -67,7 +67,7 @@
 	return IRQ_HANDLED;
 }
 
-struct irqaction gic_compare_irqaction = {
+static struct irqaction gic_compare_irqaction = {
 	.handler = gic_compare_interrupt,
 	.percpu_dev_id = &gic_clockevent_device,
 	.flags = IRQF_PERCPU | IRQF_TIMER,