--- zzzz-none-000/linux-3.10.107/lib/is_single_threaded.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/lib/is_single_threaded.c	2021-02-04 17:41:59.000000000 +0000
@@ -36,8 +36,7 @@
 		if (unlikely(p == task->group_leader))
 			continue;
 
-		t = p;
-		do {
+		for_each_thread(p, t) {
 			if (unlikely(t->mm == mm))
 				goto found;
 			if (likely(t->mm))
@@ -48,7 +47,7 @@
 			 * forked before exiting.
 			 */
 			smp_rmb();
-		} while_each_thread(p, t);
+		}
 	}
 	ret = true;
 found: