Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/irq_poll.c b/lib/irq_poll.c
index 86a7099..2f17b48 100644
--- a/lib/irq_poll.c
+++ b/lib/irq_poll.c
@@ -35,7 +35,7 @@
 
 	local_irq_save(flags);
 	list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
-	__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
+	raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
 	local_irq_restore(flags);
 }
 EXPORT_SYMBOL(irq_poll_sched);