Dump the resultant and comparison maps on failure.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/maps.c | 51 +++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
index fd0c464fcf95..1c7293476aca 100644
--- a/tools/perf/tests/maps.c
+++ b/tools/perf/tests/maps.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <inttypes.h>
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 #include "tests.h"
@@ -17,22 +18,42 @@ static int check_maps(struct map_def *merged, unsigned int size, struct maps *ma
 {
 	struct map_rb_node *rb_node;
 	unsigned int i = 0;
-
-	maps__for_each_entry(maps, rb_node) {
-		struct map *map = rb_node->map;
-
-		if (i > 0)
-			TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
-
-		TEST_ASSERT_VAL("wrong map start",  map__start(map) == merged[i].start);
-		TEST_ASSERT_VAL("wrong map end",    map__end(map) == merged[i].end);
-		TEST_ASSERT_VAL("wrong map name",  !strcmp(map__dso(map)->name, merged[i].name));
-		TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 1);
-
-		i++;
+	bool failed = false;
+
+	if (maps__nr_maps(maps) != size) {
+		pr_debug("Expected %d maps, got %d", size, maps__nr_maps(maps));
+		failed = true;
+	} else {
+		maps__for_each_entry(maps, rb_node) {
+			struct map *map = rb_node->map;
+
+			if (map__start(map) != merged[i].start ||
+			    map__end(map) != merged[i].end ||
+			    strcmp(map__dso(map)->name, merged[i].name) ||
+			    refcount_read(&map->refcnt) != 1) {
+				failed = true;
+			}
+			i++;
+		}
 	}
-
-	return TEST_OK;
+	if (failed) {
+		pr_debug("Expected:\n");
+		for (i = 0; i < size; i++) {
+			pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: 1\n",
+				merged[i].start, merged[i].end, merged[i].name);
+		}
+		pr_debug("Got:\n");
+		maps__for_each_entry(maps, rb_node) {
+			struct map *map = rb_node->map;
+
+			pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: %d\n",
+				map__start(map),
+				map__end(map),
+				map__dso(map)->name,
+				refcount_read(&map->refcnt));
+		}
+	}
+	return failed ? TEST_FAIL : TEST_OK;
 }
 
 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
-- 
2.40.0.rc1.284.g88254d51c5-goog