diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h index 61c236850ca866..cbbcd18d418684 100644 --- a/include/linux/maple_tree.h +++ b/include/linux/maple_tree.h @@ -592,6 +592,20 @@ static __always_inline void mas_reset(struct ma_state *mas) #define mas_for_each(__mas, __entry, __max) \ while (((__entry) = mas_find((__mas), (__max))) != NULL) +/** + * mas_for_each_rev() - Iterate over a range of the maple tree in reverse order. + * @__mas: Maple Tree operation state (maple_state) + * @__entry: Entry retrieved from the tree + * @__min: minimum index to retrieve from the tree + * + * When returned, mas->index and mas->last will hold the entire range for the + * entry. + * + * Note: may return the zero entry. + */ +#define mas_for_each_rev(__mas, __entry, __min) \ + while (((__entry) = mas_find_rev((__mas), (__min))) != NULL) + #ifdef CONFIG_DEBUG_MAPLE_TREE enum mt_dump_format { mt_dump_dec,