diff options
| -rw-r--r-- | lib/maple_tree.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 4e05511c8d1e..4eda94906360 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -3547,9 +3547,20 @@ static inline int mas_root_expand(struct ma_state *mas, void *entry) return slot; } +/* + * mas_store_root() - Storing value into root. + * @mas: The maple state + * @entry: The entry to store. + * + * There is no root node now and we are storing a value into the root - this + * function either assigns the pointer or expands into a node. + */ static inline void mas_store_root(struct ma_state *mas, void *entry) { - if (likely((mas->last != 0) || (mas->index != 0))) + if (!entry) { + if (!mas->index) + rcu_assign_pointer(mas->tree->ma_root, NULL); + } else if (likely((mas->last != 0) || (mas->index != 0))) mas_root_expand(mas, entry); else if (((unsigned long) (entry) & 3) == 2) mas_root_expand(mas, entry); |