Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 658664a..df1edb5 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -1311,8 +1311,7 @@
 
 void global_cache_flush(void)
 {
-	if (on_each_cpu(ipi_handler, NULL, 1) != 0)
-		panic(PFX "timed out waiting for the other CPUs!\n");
+	on_each_cpu(ipi_handler, NULL, 1);
 }
 EXPORT_SYMBOL(global_cache_flush);