From patchwork Fri Mar 27 11:11:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen Yu X-Patchwork-Id: 11462215 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 342E96CA for ; Fri, 27 Mar 2020 11:13:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C104206F1 for ; Fri, 27 Mar 2020 11:13:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726465AbgC0LNa (ORCPT ); Fri, 27 Mar 2020 07:13:30 -0400 Received: from mga06.intel.com ([134.134.136.31]:65535 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726217AbgC0LNa (ORCPT ); Fri, 27 Mar 2020 07:13:30 -0400 IronPort-SDR: 5mjP/eToJptF8XXS5ET8vWaZummJ0kMenL1I1P/2o0XsuxHnDZzcqfsS+D8G5YyICgox8m3sbx POOqDJW9xEqw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Mar 2020 04:13:29 -0700 IronPort-SDR: 1TMMu0bX7LuJ4UwoUGRyHRf7VQ5nlu/6g+WiYeRMJZo1fivt+FUk4Ryr2Nt3AW5nK7X87H6Ptg Iu4ikqUsaBqg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,312,1580803200"; d="scan'208";a="247854794" Received: from chenyu-office.sh.intel.com ([10.239.158.173]) by orsmga003.jf.intel.com with ESMTP; 27 Mar 2020 04:13:27 -0700 From: Chen Yu To: linux-pm@vger.kernel.org Cc: Pavel Machek , linux-kernel@vger.kernel.org, Chen Yu , "Rafael J. Wysocki" , Len Brown , Andy Shevchenko Subject: [PATCH] PM / sleep: Add pm_debug_messages boot command control Date: Fri, 27 Mar 2020 19:11:41 +0800 Message-Id: <20200327111141.14324-1-yu.c.chen@intel.com> X-Mailer: git-send-email 2.17.1 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Debug messages from the system suspend/hibernation infrastructure is disabled by default, and can only be enabled after the system has boot up via /sys/power/pm_debug_messages. This makes the hibernation resume hard to track as it involves system boot up across hibernation. There's no chance for software_resume() to track the resume process, eg. Turning on the pm_debug_messages during boot up by appending 'pm_debug_message'. Cc: "Rafael J. Wysocki" Cc: Len Brown Cc: Andy Shevchenko Signed-off-by: Chen Yu --- kernel/power/main.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/power/main.c b/kernel/power/main.c index 69b7a8aeca3b..1da3d7c15e03 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj, power_attr(pm_debug_messages); +static int __init pm_debug_message_setup(char *str) +{ + pm_debug_messages_on = true; + return 1; +} +__setup("pm_debug_message", pm_debug_message_setup); + /** * __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message.