From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF4C4C04A6B for ; Wed, 8 May 2019 20:24:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BFC3D20675 for ; Wed, 8 May 2019 20:24:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728917AbfEHUY5 (ORCPT ); Wed, 8 May 2019 16:24:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:35116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728832AbfEHUYy (ORCPT ); Wed, 8 May 2019 16:24:54 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5829821726; Wed, 8 May 2019 20:24:54 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.92) (envelope-from ) id 1hOT7V-0007jE-D2; Wed, 08 May 2019 16:24:53 -0400 Message-Id: <20190508202453.294437486@goodmis.org> User-Agent: quilt/0.65 Date: Wed, 08 May 2019 16:24:37 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Arnd Bergmann , Anders Roxell Subject: [for-next][PATCH 10/13] tracing: Allow RCU to run between postponed startup tests References: <20190508202427.252736423@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anders Roxell When building a allmodconfig kernel for arm64 and boot that in qemu, CONFIG_FTRACE_STARTUP_TEST gets enabled and that takes time so the watchdog expires and prints out a message like this: 'watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:1]' Depending on what the what test gets called from init_trace_selftests() it stays minutes in the loop. Rework so that function cond_resched() gets called in the init_trace_selftests loop. Link: http://lkml.kernel.org/r/20181130145622.26334-1-anders.roxell@linaro.org Co-developed-by: Arnd Bergmann Signed-off-by: Arnd Bergmann Signed-off-by: Anders Roxell Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 3259019cc66d..4269af5905e4 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1722,6 +1722,10 @@ static __init int init_trace_selftests(void) pr_info("Running postponed tracer tests:\n"); list_for_each_entry_safe(p, n, &postponed_selftests, list) { + /* This loop can take minutes when sanitizers are enabled, so + * lets make sure we allow RCU processing. + */ + cond_resched(); ret = run_tracer_selftest(p->type); /* If the test fails, then warn and remove from available_tracers */ if (ret < 0) { -- 2.20.1