+static int check_loop_return(int ret, int loop_ret, int loop_osl_errno)
+{
+ if (ret >= 0)
+ return ret;
+ assert(ret == -E_OSL);
+ if (osl_errno != E_OSL_LOOP)
+ /* error not caused by loop function returning negative. */
+ return ret;
+ assert(loop_ret < 0);
+ if (loop_ret == -E_LOOP_COMPLETE) /* no error */
+ return 1;
+ if (loop_ret == -E_OSL) { /* osl error in loop function */
+ assert(loop_osl_errno);
+ osl_errno = loop_osl_errno;
+ }
+ return loop_ret;
+}
+
+static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private_data,
+ osl_rbtree_loop_func *func, int *loop_ret, int *loop_osl_errno)
+{
+ int ret = osl(osl_rbtree_loop_reverse(t, col_num, private_data, func));
+ return check_loop_return(ret, *loop_ret, *loop_osl_errno);
+}
+
+static int print_user_stats(void)