1 files changed, 120 insertions, 0 deletions

diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
index ec847bf4dcb4..f1db333270e9 100644
--- a/lib/test_maple_tree.c
+++ b/lib/test_maple_tree.c
@@ -1709,6 +1709,74 @@ static noinline void check_forking(struct maple_tree *mt)
 	mtree_destroy(&newmt);
 }
 
+static noinline void check_iteration(struct maple_tree *mt)
+{
+	int i, nr_entries = 125;
+	void *val;
+	MA_STATE(mas, mt, 0, 0);
+
+	for (i = 0; i <= nr_entries; i++)
+		mtree_store_range(mt, i * 10, i * 10 + 9,
+				  xa_mk_value(i), GFP_KERNEL);
+
+	mt_set_non_kernel(99999);
+
+	i = 0;
+	mas_lock(&mas);
+	mas_for_each(&mas, val, 925) {
+		MT_BUG_ON(mt, mas.index != i * 10);
+		MT_BUG_ON(mt, mas.last != i * 10 + 9);
+		/* Overwrite end of entry 92 */
+		if (i == 92) {
+			mas.index = 925;
+			mas.last = 929;
+			mas_store(&mas, val);
+		}
+		i++;
+	}
+	/* Ensure mas_find() gets the next value */
+	val = mas_find(&mas, ULONG_MAX);
+	MT_BUG_ON(mt, val != xa_mk_value(i));
+
+	mas_set(&mas, 0);
+	i = 0;
+	mas_for_each(&mas, val, 785) {
+		MT_BUG_ON(mt, mas.index != i * 10);
+		MT_BUG_ON(mt, mas.last != i * 10 + 9);
+		/* Overwrite start of entry 78 */
+		if (i == 78) {
+			mas.index = 780;
+			mas.last = 785;
+			mas_store(&mas, val);
+		} else {
+			i++;
+		}
+	}
+	val = mas_find(&mas, ULONG_MAX);
+	MT_BUG_ON(mt, val != xa_mk_value(i));
+
+	mas_set(&mas, 0);
+	i = 0;
+	mas_for_each(&mas, val, 765) {
+		MT_BUG_ON(mt, mas.index != i * 10);
+		MT_BUG_ON(mt, mas.last != i * 10 + 9);
+		/* Overwrite end of entry 76 and advance to the end */
+		if (i == 76) {
+			mas.index = 760;
+			mas.last = 765;
+			mas_store(&mas, val);
+			mas_next(&mas, ULONG_MAX);
+		}
+		i++;
+	}
+	/* Make sure the next find returns the one after 765, 766-769 */
+	val = mas_find(&mas, ULONG_MAX);
+	MT_BUG_ON(mt, val != xa_mk_value(76));
+	mas_unlock(&mas);
+	mas_destroy(&mas);
+	mt_set_non_kernel(0);
+}
+
 static noinline void check_mas_store_gfp(struct maple_tree *mt)
 {
 
@@ -2602,6 +2670,49 @@ static noinline void check_empty_area_window(struct maple_tree *mt)
 	rcu_read_unlock();
 }
 
+static noinline void check_empty_area_fill(struct maple_tree *mt)
+{
+	const unsigned long max = 0x25D78000;
+	unsigned long size;
+	int loop, shift;
+	MA_STATE(mas, mt, 0, 0);
+
+	mt_set_non_kernel(99999);
+	for (shift = 12; shift <= 16; shift++) {
+		loop = 5000;
+		size = 1 << shift;
+		while (loop--) {
+			mas_set(&mas, 0);
+			mas_lock(&mas);
+			MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != 0);
+			MT_BUG_ON(mt, mas.last != mas.index + size - 1);
+			mas_store_gfp(&mas, (void *)size, GFP_KERNEL);
+			mas_unlock(&mas);
+			mas_reset(&mas);
+		}
+	}
+
+	/* No space left. */
+	size = 0x1000;
+	rcu_read_lock();
+	MT_BUG_ON(mt, mas_empty_area(&mas, 0, max, size) != -EBUSY);
+	rcu_read_unlock();
+
+	/* Fill a depth 3 node to the maximum */
+	for (unsigned long i = 629440511; i <= 629440800; i += 6)
+		mtree_store_range(mt, i, i + 5, (void *)i, GFP_KERNEL);
+	/* Make space in the second-last depth 4 node */
+	mtree_erase(mt, 631668735);
+	/* Make space in the last depth 4 node */
+	mtree_erase(mt, 629506047);
+	mas_reset(&mas);
+	/* Search from just after the gap in the second-last depth 4 */
+	rcu_read_lock();
+	MT_BUG_ON(mt, mas_empty_area(&mas, 629506048, 690000000, 0x5000) != 0);
+	rcu_read_unlock();
+	mt_set_non_kernel(0);
+}
+
 static DEFINE_MTREE(tree);
 static int maple_tree_seed(void)
 {
@@ -2660,6 +2771,10 @@ static int maple_tree_seed(void)
 #endif
 
 	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+	check_iteration(&tree);
+	mtree_destroy(&tree);
+
+	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
 	check_forking(&tree);
 	mtree_destroy(&tree);
 
@@ -2854,6 +2969,11 @@ static int maple_tree_seed(void)
 	check_empty_area_window(&tree);
 	mtree_destroy(&tree);
 
+	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+	check_empty_area_fill(&tree);
+	mtree_destroy(&tree);
+
+
 #if defined(BENCH)
 skip:
 #endif