From patchwork Tue Apr 26 12:24:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?TWFyay1QSyBUc2FpICjolKHmspvliZsp?= X-Patchwork-Id: 12827019 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C005AC433F5 for ; Tue, 26 Apr 2022 12:25:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=m7rilPIwncmOwt5dThKlcleOlBUVALoguQerjQUucOs=; b=fHTkI8qjAabnrZ sjTBKxV0Pz9rEDqbwWRyU2LPR0fruWdjCQepnNzcD7qtdNZyld4TJY0YI9CZLHXlzNKP/ePwFWNJk sif3EMyPnTc+FAMkZk1MlmPn02AQKT7ILaWoNWye9o47Yg6BD1spprUZhovKA9iq4MHiURfcknoK5 /Jy23TLq06NIrFcqnYiTHqmqAU0kX6TR8khk3Xy+5sa7yeLGh7Gp3hPGscBg8YGcuMFU6R/Mh6Hqx ggw9Xc+tfMDDFSwRVdSJzK6CakBF3/1prMPptbxC1jcFpbzkDir+wCkHhJRwKMaNDUA3tLxV6cpJ6 yDIUGA+dkaM3vQXITRKw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1njKF9-00EFNA-QC; Tue, 26 Apr 2022 12:24:35 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1njKF6-00EFLM-Co; Tue, 26 Apr 2022 12:24:33 +0000 X-UUID: b3d519fb3fed4925a6dafce01e35fc0b-20220426 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.4, REQID:db93e1e4-56fa-46f8-888a-7ba287098918, OB:0, LO B:0,IP:0,URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACTI ON:release,TS:0 X-CID-META: VersionHash:faefae9, CLOUDID:f781c22e-6199-437e-8ab4-9920b4bc5b76, C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,File:nil,QS:0,BEC:nil X-UUID: b3d519fb3fed4925a6dafce01e35fc0b-20220426 Received: from mtkcas67.mediatek.inc [(172.29.193.45)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 678904668; Tue, 26 Apr 2022 05:24:26 -0700 Received: from mtkexhb02.mediatek.inc (172.21.101.103) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 26 Apr 2022 05:24:25 -0700 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkexhb02.mediatek.inc (172.21.101.103) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 26 Apr 2022 20:24:15 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 26 Apr 2022 20:24:15 +0800 From: Mark-PK Tsai To: CC: , , , , , , Subject: [PATCH v4 1/2] tracing: Avoid adding tracer option before update_tracer_options Date: Tue, 26 Apr 2022 20:24:06 +0800 Message-ID: <20220426122407.17042-2-mark-pk.tsai@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220426122407.17042-1-mark-pk.tsai@mediatek.com> References: <20220426122407.17042-1-mark-pk.tsai@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220426_052432_482122_A703326F X-CRM114-Status: GOOD ( 11.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org To prepare for support asynchronous tracer_init_tracefs initcall, avoid calling create_trace_option_files before __update_tracer_options. Otherwise, create_trace_option_files will show warning because some tracers in trace_types list are already in tr->topts. For example, hwlat_tracer call register_tracer in late_initcall, and global_trace.dir is already created in tracing_init_dentry, hwlat_tracer will be put into tr->topts. Then if the __update_tracer_options is executed after hwlat_tracer registered, create_trace_option_files find that hwlat_tracer is already in tr->topts. Link: https://lore.kernel.org/lkml/20220322133339.GA32582@xsang-OptiPlex-9020/ Reported-by: kernel test robot Signed-off-by: Mark-PK Tsai --- kernel/trace/trace.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index f4de111fa18f..0ec7b013104a 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -6332,12 +6332,18 @@ static void tracing_set_nop(struct trace_array *tr) tr->current_trace = &nop_trace; } +static bool tracer_options_updated; + static void add_tracer_options(struct trace_array *tr, struct tracer *t) { /* Only enable if the directory has been created already. */ if (!tr->dir) return; + /* Only create trace option files after update_tracer_options finish */ + if (!tracer_options_updated) + return; + create_trace_option_files(tr, t); } @@ -9176,6 +9182,7 @@ static void __update_tracer_options(struct trace_array *tr) static void update_tracer_options(struct trace_array *tr) { mutex_lock(&trace_types_lock); + tracer_options_updated = true; __update_tracer_options(tr); mutex_unlock(&trace_types_lock); }