livepatch/arm64: use for_each_process_thread instead instead of while_each_thread

euler inclusion
category: bugfix
Bugzilla: 5507
CVE: N/A

----------------------------------------

The commit 0c740d0a ("introduce for_each_thread() to replace the buggy
while_each_thread()") replace while_each_thread. while_each_thread()
and next_thread() should die, almost every lockless.

So use for_each_process_thread which is more safer than others to
check the livepatch activeness function when enable.
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: NLi Bin <huawei.libin@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

arch/arm64/kernel/livepatch.c

@@ -109,7 +109,7 @@ int klp_check_calltrace(struct klp_patch *patch, int enable)
 		.ret = 0
 	};
 
-	do_each_thread(g, t) {
+	for_each_process_thread(g, t) {
 		frame.fp = thread_saved_fp(t);
 		frame.pc = thread_saved_pc(t);
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
@@ -122,7 +122,7 @@ int klp_check_calltrace(struct klp_patch *patch, int enable)
 			show_stack(t, NULL);
 			goto out;
 		}
-	} while_each_thread(g, t);
+	}
 
 out:
 	return ret;