From patchwork Wed Nov 6 03:04:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 11229153 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 DE23C1390 for ; Wed, 6 Nov 2019 03:07:11 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id A269B21D7F for ; Wed, 6 Nov 2019 03:07:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="s8CaNtNR"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=arista.com header.i=@arista.com header.b="U3UPaJg+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A269B21D7F Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=arista.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=2q0H+esmVBjfy8ARwmGUSltJXwDJuck6YBrnJ+kW6Y8=; b=s8CaNtNRvdku53 smcwceszVVr/jHQ+dJw05deMKyfGs4NCaF1SFYa4S5ldABIMvn9FZid3YGvWtZgXZJZJMgzAa/cil T8Yx9HDwNqsT5bh7TE5HuT3HEEtD5ZDBGQV09LSDY6bx3PM0nGvIOEZ8ieHaeipW2EU2nXgdnSmGU RSqe4zaFKgz1gI7g91+Aon55fthMK26az6odGiQ6cg2njEoqY4XpqZpTKRq/PbiPcF1g76yJzs2bV iY5Nu4yOxXyjn/dyYR6oU2FDcgWpHSCI2YCr05h4RhhHw/CrfBe54kZuRO4HEjvPODawEL8+OzrY1 WL2rnjH2QqqrV7fGautA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSBf2-0002J0-1q; Wed, 06 Nov 2019 03:07:08 +0000 Received: from mail-pl1-x642.google.com ([2607:f8b0:4864:20::642]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSBeT-0001lm-F7 for linux-arm-kernel@lists.infradead.org; Wed, 06 Nov 2019 03:06:35 +0000 Received: by mail-pl1-x642.google.com with SMTP id k7so10746316pll.1 for ; Tue, 05 Nov 2019 19:06:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=T4xceT58B6sbL4PhV43oCBSGVJEvO1DNZo325HcSVkg=; b=U3UPaJg+2y87NqfpsnwuDDEKpAogHQ3AUxQixZIutQNYD5rfoA7vZzTIL+Wd243QXP mBL9fQeYEt1+bO4QIY7SYhqSyra1ePH4jDwMACZsXCbmhl2yQo1oRhY7v4QTdpinYHuz GK3D7hxrdvZ3KaUactgAQElVQ2s6CAfVLUEqCHRsM25V4z4qa6ZPR6D/CmLuyTMpaUxn 2EaC/jnzc+e2qN8UcInFBc9mIef6p2J19lLYVVbKE6XVpO1h2ngK3yPVEbB8GXDk2xOZ sKpwDTALK4MbaX2Rq4LrkGBNxOXmhl8LsikDWGzwGCe5RVjq721/u3WUUXx2rqLMK6A1 GBGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=T4xceT58B6sbL4PhV43oCBSGVJEvO1DNZo325HcSVkg=; b=VyV92p6E80QcfWHi4cPn1q4BXUC27gQl7J4tliQyxFyG+vvU8gZlxUi3/NATS2idJR bxmOYGsKKGuq3HWFlRMTMLviVBnBBGxiHnF2FX2jhH59EwgN50UKQcWKrCvw5aDXGkwp B+cinyOZoLOrQ+5I/SmlEwmCIH3JZTHjToXiahm8Hg27MLf+Io74zUXu7TYLwoYqoHyc CxuuBDc02PzKxp2KahbNvdrpEuP7vIjH5qsTWn4RdWQuEUMNOsYJs6mZohDaJc+L4/jK Q3lVXWfiRgd6a8blNWAcwDkvLVOPNmA5i2TWsmBT0py21p3Mb0F69O7at66clLhsYX4i Yukg== X-Gm-Message-State: APjAAAX7YN8T57QHThICIpjj+S1fjjxjf78V8iuKcmpp76DWHt9BsqmR TlUb+sf5okowjU+WkN7x7jZJVw== X-Google-Smtp-Source: APXvYqyk+jwPIxnw+WSN1kToR1F8PVjBE6uY2e4pxOa1tt6VZ8XuJUjdGnhvtrpfbvJH4vxVL4+yFw== X-Received: by 2002:a17:902:7783:: with SMTP id o3mr132537pll.313.1573009592111; Tue, 05 Nov 2019 19:06:32 -0800 (PST) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id k24sm19570487pgl.6.2019.11.05.19.06.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2019 19:06:31 -0800 (PST) From: Dmitry Safonov To: linux-kernel@vger.kernel.org Subject: [PATCH 06/50] arm: Add loglvl to dump_backtrace() Date: Wed, 6 Nov 2019 03:04:57 +0000 Message-Id: <20191106030542.868541-7-dima@arista.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191106030542.868541-1-dima@arista.com> References: <20191106030542.868541-1-dima@arista.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191105_190633_544907_150D1FD2 X-CRM114-Status: GOOD ( 14.16 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:642 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Petr Mladek , Dmitry Safonov , Tetsuo Handa , Greg Kroah-Hartman , Dmitry Safonov <0x7f454c46@gmail.com>, Russell King , Steven Rostedt , Sergey Senozhatsky , clang-built-linux@googlegroups.com, Jiri Slaby , Andrew Morton , Will Deacon , Ingo Molnar , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Currently, the log-level of show_stack() depends on a platform realization. It creates situations where the headers are printed with lower log level or higher than the stacktrace (depending on a platform or user). Furthermore, it forces the logic decision from user to an architecture side. In result, some users as sysrq/kdb/etc are doing tricks with temporary rising console_loglevel while printing their messages. And in result it not only may print unwanted messages from other CPUs, but also omit printing at all in the unlucky case where the printk() was deferred. Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier approach than introducing more printk buffers. Also, it will consolidate printings with headers. Add log level argument to dump_backtrace() as a preparation for introducing show_stack_loglvl(). As a good side-effect __die() now prints not only "Stack:" header with KERN_EMERG, but the backtrace itself. Cc: Russell King Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: clang-built-linux@googlegroups.com [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov --- arch/arm/kernel/traps.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 69e35462c9e9..e4f4ec8a1899 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -200,17 +200,19 @@ static void dump_instr(const char *lvl, struct pt_regs *regs) } #ifdef CONFIG_ARM_UNWIND -static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) +static inline void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, + const char *loglvl) { - unwind_backtrace(regs, tsk, KERN_DEBUG); + unwind_backtrace(regs, tsk, loglvl); } #else -static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) +static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, + const char *loglvl) { unsigned int fp, mode; int ok = 1; - printk("Backtrace: "); + printk("%sBacktrace: ", loglvl); if (!tsk) tsk = current; @@ -237,13 +239,13 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) pr_cont("\n"); if (ok) - c_backtrace(fp, mode, NULL); + c_backtrace(fp, mode, loglvl); } #endif void show_stack(struct task_struct *tsk, unsigned long *sp) { - dump_backtrace(NULL, tsk); + dump_backtrace(NULL, tsk, KERN_DEFAULT); barrier(); } @@ -285,7 +287,7 @@ static int __die(const char *str, int err, struct pt_regs *regs) if (!user_mode(regs) || in_interrupt()) { dump_mem(KERN_EMERG, "Stack: ", regs->ARM_sp, THREAD_SIZE + (unsigned long)task_stack_page(tsk)); - dump_backtrace(regs, tsk); + dump_backtrace(regs, tsk, KERN_EMERG); dump_instr(KERN_EMERG, regs); }