Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
index 0251dd3..9235b76 100644
--- a/tools/perf/bench/mem-functions.c
+++ b/tools/perf/bench/mem-functions.c
@@ -8,8 +8,7 @@
  */
 
 #include "debug.h"
-#include "../perf.h"
-#include "../util/util.h"
+#include "../perf-sys.h"
 #include <subcmd/parse-options.h>
 #include "../util/header.h"
 #include "../util/cloexec.h"
@@ -21,9 +20,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <sys/time.h>
 #include <errno.h>
 #include <linux/time64.h>
+#include <linux/zalloc.h>
 
 #define K 1024