Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
index b889a28..6f34d08 100644
--- a/tools/perf/tests/hists_common.c
+++ b/tools/perf/tests/hists_common.c
@@ -1,15 +1,17 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <inttypes.h>
-#include "perf.h"
 #include "util/debug.h"
+#include "util/dso.h"
+#include "util/event.h" // struct perf_sample
+#include "util/map.h"
 #include "util/symbol.h"
 #include "util/sort.h"
 #include "util/evsel.h"
-#include "util/evlist.h"
 #include "util/machine.h"
 #include "util/thread.h"
 #include "tests/hists_common.h"
 #include <linux/kernel.h>
+#include <linux/perf_event.h>
 
 static struct {
 	u32 pid;
@@ -161,7 +163,7 @@
 void print_hists_in(struct hists *hists)
 {
 	int i = 0;
-	struct rb_root *root;
+	struct rb_root_cached *root;
 	struct rb_node *node;
 
 	if (hists__has(hists, need_collapse))
@@ -170,7 +172,7 @@
 		root = hists->entries_in;
 
 	pr_info("----- %s --------\n", __func__);
-	node = rb_first(root);
+	node = rb_first_cached(root);
 	while (node) {
 		struct hist_entry *he;
 
@@ -191,13 +193,13 @@
 void print_hists_out(struct hists *hists)
 {
 	int i = 0;
-	struct rb_root *root;
+	struct rb_root_cached *root;
 	struct rb_node *node;
 
 	root = &hists->entries;
 
 	pr_info("----- %s --------\n", __func__);
-	node = rb_first(root);
+	node = rb_first_cached(root);
 	while (node) {
 		struct hist_entry *he;