continue;
 
                if (ti->flush_supported)
-                       return 1;
+                       return true;
 
                if (ti->type->iterate_devices &&
                    ti->type->iterate_devices(ti, device_flush_capable, &flush))
-                       return 1;
+                       return true;
        }
 
-       return 0;
+       return false;
 }
 
 static bool dm_table_discard_zeroes_data(struct dm_table *t)
                ti = dm_table_get_target(t, i++);
 
                if (ti->discard_zeroes_data_unsupported)
-                       return 0;
+                       return false;
        }
 
-       return 1;
+       return true;
 }
 
 static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev,
 
                if (!ti->type->iterate_devices ||
                    !ti->type->iterate_devices(ti, func, NULL))
-                       return 0;
+                       return false;
        }
 
-       return 1;
+       return true;
 }
 
 static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev,
                        continue;
 
                if (ti->discards_supported)
-                       return 1;
+                       return true;
 
                if (ti->type->iterate_devices &&
                    ti->type->iterate_devices(ti, device_discard_capable, NULL))
-                       return 1;
+                       return true;
        }
 
-       return 0;
+       return false;
 }
 
 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,