Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/ui/browsers/header.c b/tools/perf/ui/browsers/header.c
index d754921..57e6e43 100644
--- a/tools/perf/ui/browsers/header.c
+++ b/tools/perf/ui/browsers/header.c
@@ -1,6 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#include "util/cache.h"
-#include "util/debug.h"
 #include "ui/browser.h"
 #include "ui/keysyms.h"
 #include "ui/ui.h"
@@ -35,7 +33,7 @@
 {
 	int key;
 	unsigned long offset;
-	const char help[] =
+	static const char help[] =
 	"h/?/F1        Show this window\n"
 	"UP/DOWN/PGUP\n"
 	"PGDN/SPACE\n"