diff options
| -rw-r--r-- | lib/maple_tree.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 5aa4c9500018..0e0158ee7ba5 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -6260,8 +6260,15 @@ static inline void mas_dup_alloc(struct ma_state *mas, struct ma_state *new_mas, for (i = 0; i < count; i++) { val = (unsigned long)mt_slot_locked(mas->tree, slots, i); val &= MAPLE_NODE_MASK; - new_slots[i] = ma_mnode_ptr((unsigned long)mas_pop_node(mas) | - val); + /* + * Warning, see rcu_assign_pointer() documentation. Since this + * is a duplication of a tree, there are no readers walking the + * tree until after the rcu_assign_pointer() call in + * mas_dup_build(). + */ + RCU_INIT_POINTER(new_slots[i], + ma_mnode_ptr((unsigned long)mas_pop_node(mas) | + val)); } } |