return fls(nr) - 1;
 }
 
-struct hmm_buffer_object *__bo_alloc(struct kmem_cache *bo_cache)
+static struct hmm_buffer_object *__bo_alloc(struct kmem_cache *bo_cache)
 {
        struct hmm_buffer_object *bo;
 
        return 0;
 }
 
-struct hmm_buffer_object *__bo_search_and_remove_from_free_rbtree(
+static struct hmm_buffer_object *__bo_search_and_remove_from_free_rbtree(
                                struct rb_node *node, unsigned int pgnr)
 {
        struct hmm_buffer_object *this, *ret_bo, *temp_bo;
        return temp_bo;
 }
 
-struct hmm_buffer_object *__bo_search_by_addr(struct rb_root *root,
+static struct hmm_buffer_object *__bo_search_by_addr(struct rb_root *root,
                                                        ia_css_ptr start)
 {
        struct rb_node *n = root->rb_node;
        return NULL;
 }
 
-struct hmm_buffer_object *__bo_search_by_addr_in_range(struct rb_root *root,
-                                       unsigned int start)
+static struct hmm_buffer_object *__bo_search_by_addr_in_range(
+               struct rb_root *root, unsigned int start)
 {
        struct rb_node *n = root->rb_node;
        struct hmm_buffer_object *bo;
        rb_insert_color(&bo->node, root);
 }
 
-struct hmm_buffer_object *__bo_break_up(struct hmm_bo_device *bdev,
+static struct hmm_buffer_object *__bo_break_up(struct hmm_bo_device *bdev,
                                        struct hmm_buffer_object *bo,
                                        unsigned int pgnr)
 {
        }
 }
 
-struct hmm_buffer_object *__bo_merge(struct hmm_buffer_object *bo,
+static struct hmm_buffer_object *__bo_merge(struct hmm_buffer_object *bo,
                                        struct hmm_buffer_object *next_bo)
 {
        struct hmm_bo_device *bdev;