maple_tree: Add mas_init() function

Add a function that will zero out the maple state struct and set some
basic defaults.

Signed-off-by: Liam Howlett <Liam.Howlett@oracle.com>

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 2effab72add10e1030757948328f460cba9389d2..98423df1e864c4c353d409b53fa09c2aac6ccc0e 100644 (file)
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -433,6 +433,7 @@ struct ma_wr_state {
                .min = 0,                                               \
                .max = ULONG_MAX,                                       \
                .alloc = NULL,                                          \
+               .mas_flags = 0,                                         \
        }
 
 #define MA_WR_STATE(name, ma_state, wr_entry)                          \
@@ -471,6 +472,16 @@ void *mas_next(struct ma_state *mas, unsigned long max);
 int mas_empty_area(struct ma_state *mas, unsigned long min, unsigned long max,
                   unsigned long size);
 
+static inline void mas_init(struct ma_state *mas, struct maple_tree *tree,
+                           unsigned long addr)
+{
+       memset(mas, 0, sizeof(struct ma_state));
+       mas->tree = tree;
+       mas->index = mas->last = addr;
+       mas->max = ULONG_MAX;
+       mas->node = MAS_START;
+}
+
 /* Checks if a mas has not found anything */
 static inline bool mas_is_none(struct ma_state *mas)
 {