Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/lib/Documentation/Makefile b/tools/perf/lib/Documentation/Makefile
new file mode 100644
index 0000000..586425a
--- /dev/null
+++ b/tools/perf/lib/Documentation/Makefile
@@ -0,0 +1,7 @@
+all:
+	rst2man man/libperf.rst > man/libperf.7
+	rst2pdf tutorial/tutorial.rst
+
+clean:
+	rm -f man/libperf.7
+	rm -f tutorial/tutorial.pdf