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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2265AC433F5 for ; Tue, 15 Feb 2022 15:38:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236515AbiBOPiJ (ORCPT ); Tue, 15 Feb 2022 10:38:09 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:42696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240738AbiBOPf3 (ORCPT ); Tue, 15 Feb 2022 10:35:29 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96BC7B7C5A; Tue, 15 Feb 2022 07:31:18 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 32A2B615EF; Tue, 15 Feb 2022 15:31:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC694C340EB; Tue, 15 Feb 2022 15:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1644939077; bh=r+bNCJC5D6dgqgospRgsdedmZ0Hcm+1d/jSHPYZYSUE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cW33WECrKyTaOtQR/TkS7u4oVBPz3nm6z5cK7ianBk7s/TV9axAI7c9xngW+6UJLp 4d23BnGI6gLNApwPZQcHy7r9Ni6KrZt4mcQM02GvWDl0n0QgKiWNLtJ6FGMoDgMSmb u3n/kQvaSlkjQJpgXxkCUmDuAMIXzsgmZbwPW3/nregypl9Z1gfFazlZpc9b/VRFFu EOzcF3Auc9PgAoYMiPiSh2t91BOSdI8ZhK/L2/95ilT6gHwACIMt0sAQmUiar7Ry8S 0GpkrrhZHUxgYh1tGClB4ydSOwYdxt7+Xv2n7PlUSGRG/Pw5wbfOurCFXWsBqNN/3F q+jMJEayVuCJw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: JaeSang Yoo , JaeSang Yoo , Steven Rostedt , Sasha Levin , mingo@redhat.com Subject: [PATCH AUTOSEL 4.19 08/11] tracing: Fix tp_printk option related with tp_printk_stop_on_boot Date: Tue, 15 Feb 2022 10:31:01 -0500 Message-Id: <20220215153104.581786-8-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220215153104.581786-1-sashal@kernel.org> References: <20220215153104.581786-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: JaeSang Yoo [ Upstream commit 3203ce39ac0b2a57a84382ec184c7d4a0bede175 ] The kernel parameter "tp_printk_stop_on_boot" starts with "tp_printk" which is the same as another kernel parameter "tp_printk". If "tp_printk" setup is called before the "tp_printk_stop_on_boot", it will override the latter and keep it from being set. This is similar to other kernel parameter issues, such as: Commit 745a600cf1a6 ("um: console: Ignore console= option") or init/do_mounts.c:45 (setup function of "ro" kernel param) Fix it by checking for a "_" right after the "tp_printk" and if that exists do not process the parameter. Link: https://lkml.kernel.org/r/20220208195421.969326-1-jsyoo5b@gmail.com Signed-off-by: JaeSang Yoo [ Fixed up change log and added space after if condition ] Signed-off-by: Steven Rostedt (Google) Signed-off-by: Sasha Levin --- kernel/trace/trace.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 17e337a22c239..19a6b088f1e72 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -232,6 +232,10 @@ __setup("trace_clock=", set_trace_boot_clock); static int __init set_tracepoint_printk(char *str) { + /* Ignore the "tp_printk_stop_on_boot" param */ + if (*str == '_') + return 0; + if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) tracepoint_printk = 1; return 1; -- 2.34.1