The maple tree node limits are implied by the parent. When walking up
the tree, the limit may not be known until a slot that does not have
implied limits are encountered. However, if the node is the left-most
or right-most node, the walking up to find that limit can be skipped.
This commit also fixes the debug/testing code that was not setting the
limit on walking down the tree as that optimization is not compatible
with this change.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
lib/maple_tree.c | 6 ++++++
tools/testing/radix-tree/maple.c | 4 ++++
2 files changed, 10 insertions(+)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index ac0245dd88dad..60bae5be008a6 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -1132,6 +1132,12 @@ static int mas_ascend(struct ma_state *mas)
return 0;
}
+ if (!mas->min)
+ set_min = true;
+
+ if (mas->max == ULONG_MAX)
+ set_max = true;
+
min = 0;
max = ULONG_MAX;
do {
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 9286d3baa12d6..75df543e019c9 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -35259,6 +35259,7 @@ static void mas_dfs_preorder(struct ma_state *mas)
struct maple_enode *prev;
unsigned char end, slot = 0;
+ unsigned long *pivots;
if (mas->node == MAS_START) {
mas_start(mas);
@@ -35291,6 +35292,9 @@ static void mas_dfs_preorder(struct ma_state *mas)
mas_ascend(mas);
goto walk_up;
}
+ pivots = ma_pivots(mte_to_node(prev), mte_node_type(prev));
+ mas->max = mas_safe_pivot(mas, pivots, slot, mte_node_type(prev));
+ mas->min = mas_safe_min(mas, pivots, slot);
return;
done:
--
2.39.2
