[PATCH v4 3/5] maple_tree: not necessary to check index/last again

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

Before calling mas_new_root(), the range has been checked.

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>

---
v4: add WARN_ON_ONCE() to check mis-usage.
---
 lib/maple_tree.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 517ddf2950e6..2226e77c00cb 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3662,7 +3662,9 @@ static inline void mas_new_root(struct ma_state *mas, void *entry)
 	void __rcu **slots;
 	unsigned long *pivots;
 
-	if (!entry && !mas->index && mas->last == ULONG_MAX) {
+	WARN_ON_ONCE(mas->index || mas->last != ULONG_MAX);
+
+	if (!entry) {
 		mas->depth = 0;
 		mas_set_height(mas);
 		rcu_assign_pointer(mas->tree->ma_root, entry);
-- 
2.34.1