[PATCH v3 3/3] maple_tree: only root node could be deficient

[Wei Yang]

Each level's right most node should have (max == ULONG_MAX). This means
current validation skips the right most node on each level.

Only the root node may be below the minimum data threshold.

Signed-off-by: Wei Yang <richard.weiyang at gmail.com>
CC: Liam R. Howlett <Liam.Howlett at Oracle.com>
CC: Sidhartha Kumar <sidhartha.kumar at oracle.com>
CC: Lorenzo Stoakes <lorenzo.stoakes at oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett at Oracle.com>

---
v2:
  adjust the change log
---
 lib/maple_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 4f2950a1c38d..667326717f35 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -7585,7 +7585,7 @@ void mt_validate(struct maple_tree *mt)
 		MAS_WARN_ON(&mas, mte_dead_node(mas.node));
 		end = mas_data_end(&mas);
 		if (MAS_WARN_ON(&mas, (end < mt_min_slot_count(mas.node)) &&
-				(mas.max != ULONG_MAX))) {
+				(!mte_is_root(mas.node)))) {
 			pr_err("Invalid size %u of " PTR_FMT "\n",
 			       end, mas_mn(&mas));
 		}
-- 
2.34.1