lib/radix-tree.c:718:17: error: implicit declaration of function '__radix_tree_delete'; did you mean 'radix_tree_delete'? [-Werror=implicit-function-declaration]
lib/radix-tree.c:1366:13: error: conflicting types for '__radix_tree_delete'; have 'bool(struct xarray *, struct xa_node *, void **)' {aka '_Bool(struct xarray *, struct xa_node *, void **)'}