Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull stacktrace fix from Ingo Molnar:
 "Fix a stack_trace_save_tsk_reliable() regression"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  stacktrace: Unbreak stack_trace_save_tsk_reliable()

kernel/stacktrace.c

@@ -207,7 +207,7 @@ int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
 
 	ret = arch_stack_walk_reliable(consume_entry, &c, tsk);
 	put_task_stack(tsk);
-	return ret;
+	return ret ? ret : c.len;
 }
 #endif