From patchwork Mon Mar 29 07:58:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 412470 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 7BD22C43381 for ; Mon, 29 Mar 2021 08:39:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58819619EB for ; Mon, 29 Mar 2021 08:39:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234490AbhC2IjL (ORCPT ); Mon, 29 Mar 2021 04:39:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:60256 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234921AbhC2Ihg (ORCPT ); Mon, 29 Mar 2021 04:37:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 099CB61929; Mon, 29 Mar 2021 08:37:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617007052; bh=ybjBk6LLyhr+xz1rjzBkqQfJqU0aSoRZsIhrvOoC+xU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BsyOjAw1eMHc7DKFfEYVcFQcMV/hM+4fdK4OOiqNl+5/P+jdANMksGnWpITMJqjQB 6dPVvfdgnXUwqBxHsK8UDR9vYghnwU2tmf8UMNLZApI+UTDYBE+urdxC0QUeOmkyEi XN4sIiBImoKMYjy7o8PA0FPlUniTJc9jVGaI8Yh0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ionela Voinescu , Lukasz Luba , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 5.11 204/254] PM: EM: postpone creating the debugfs dir till fs_initcall Date: Mon, 29 Mar 2021 09:58:40 +0200 Message-Id: <20210329075639.803178376@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075633.135869143@linuxfoundation.org> References: <20210329075633.135869143@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lukasz Luba [ Upstream commit fb9d62b27ab1e07d625591549c314b7d406d21df ] The debugfs directory '/sys/kernel/debug/energy_model' is needed before the Energy Model registration can happen. With the recent change in debugfs subsystem it's not allowed to create this directory at early stage (core_initcall). Thus creating this directory would fail. Postpone the creation of the EM debug dir to later stage: fs_initcall. It should be safe since all clients: CPUFreq drivers, Devfreq drivers will be initialized in later stages. The custom debug log below prints the time of creation the EM debug dir at fs_initcall and successful registration of EMs at later stages. [ 1.505717] energy_model: creating rootdir [ 3.698307] cpu cpu0: EM: created perf domain [ 3.709022] cpu cpu1: EM: created perf domain Fixes: 56348560d495 ("debugfs: do not attempt to create a new file before the filesystem is initalized") Reported-by: Ionela Voinescu Signed-off-by: Lukasz Luba Reviewed-by: Greg Kroah-Hartman Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- kernel/power/energy_model.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index 1358fa4abfa8..0f4530b3a8cd 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -98,7 +98,7 @@ static int __init em_debug_init(void) return 0; } -core_initcall(em_debug_init); +fs_initcall(em_debug_init); #else /* CONFIG_DEBUG_FS */ static void em_debug_create_pd(struct device *dev) {} static void em_debug_remove_pd(struct device *dev) {}