[PATCH 2/4] maple_tree: add a test check deficient node

[Wei Yang <richard.weiyang@gmail.com>]

Add a test to assert when resulting a deficient node on splitting.

We can achieve this by build a tree with two nodes. With the left
node with consecutive data from 0 and leave some room for the final
insert to locate in left node. And the right node a full node to force
the split happens on the left node.

Another simple way to trigger this is to inserting from 0 to 16 till the
first split happens. The new right node is deficient. But current
validation skip the right node. This will be fixed in next patch.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Liam R. Howlett <Liam.Howlett@Oracle.com>
CC: Sidhartha Kumar <sidhartha.kumar@oracle.com>
CC: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
---
 lib/test_maple_tree.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
index 2ef72f6c6d1b..7cd38c884869 100644
--- a/lib/test_maple_tree.c
+++ b/lib/test_maple_tree.c
@@ -1563,6 +1563,30 @@ static noinline void __init check_root_expand(struct maple_tree *mt)
 	mas_unlock(&mas);
 }
 
+static noinline void __init check_deficient_node(struct maple_tree *mt)
+{
+	MA_STATE(mas, mt, 0, 0);
+	int count;
+
+	mas_lock(&mas);
+	for (count = 0; count < 10; count++) {
+		mas_set(&mas, count);
+		mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+	}
+
+	for (count = 20; count < 39; count++) {
+		mas_set(&mas, count);
+		mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+	}
+
+	for (count = 10; count < 12; count++) {
+		mas_set(&mas, count);
+		mas_store_gfp(&mas, xa_mk_value(count), GFP_KERNEL);
+	}
+	mas_unlock(&mas);
+	mt_validate(mt);
+}
+
 static noinline void __init check_gap_combining(struct maple_tree *mt)
 {
 	struct maple_enode *mn1, *mn2;
@@ -3804,6 +3828,10 @@ static int __init maple_tree_seed(void)
 	check_root_expand(&tree);
 	mtree_destroy(&tree);
 
+	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+	check_deficient_node(&tree);
+	mtree_destroy(&tree);
+
 	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
 	check_iteration(&tree);
 	mtree_destroy(&tree);
-- 
2.34.1