mas_set_range() resets the node to MAS_START, which will cause a re-walk
of the tree to the range. This is unnecessary when the maple state is
already at the correct location of the write. Add a function that only
sets the range to avoid unnecessary re-walking of the tree.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
include/linux/maple_tree.h | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 295548cca8b3..ed50d8f459e6 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -531,6 +531,22 @@ static inline void mas_reset(struct ma_state *mas)
*/
#define mas_for_each(__mas, __entry, __max) \
while (((__entry) = mas_find((__mas), (__max))) != NULL)
+/**
+ * __mas_set_range() - Set up Maple Tree operation state to a sub-range of the
+ * current location.
+ * @mas: Maple Tree operation state.
+ * @start: New start of range in the Maple Tree.
+ * @last: New end of range in the Maple Tree.
+ *
+ * set the internal maple state values to a sub-range.
+ * Please use mas_set_range() if you do not know where you are in the tree.
+ */
+static inline void __mas_set_range(struct ma_state *mas, unsigned long start,
+ unsigned long last)
+{
+ mas->index = start;
+ mas->last = last;
+}
/**
* mas_set_range() - Set up Maple Tree operation state for a different index.
@@ -545,9 +561,8 @@ static inline void mas_reset(struct ma_state *mas)
static inline
void mas_set_range(struct ma_state *mas, unsigned long start, unsigned long last)
{
- mas->index = start;
- mas->last = last;
- mas->node = MAS_START;
+ __mas_set_range(mas, start, last);
+ mas->node = MAS_START;
}
/**
--
2.39.2
