From patchwork Tue Apr 5 07:34:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 556515 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 EA953C43219 for ; Tue, 5 Apr 2022 12:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383358AbiDEMZh (ORCPT ); Tue, 5 Apr 2022 08:25:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350159AbiDEKvQ (ORCPT ); Tue, 5 Apr 2022 06:51:16 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5ECBFA7765; Tue, 5 Apr 2022 03:27:54 -0700 (PDT) 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 sin.source.kernel.org (Postfix) with ESMTPS id CC1BECE0B18; Tue, 5 Apr 2022 10:27:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DE871C385A0; Tue, 5 Apr 2022 10:27:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649154471; bh=6wKpk08UUBQ09fdq2h7b6YuZ7LLQ3UhRsOaB5Ym2fp0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jVWdguYi6AxukZILCOGsewCG3mYKwf4azTbHqA3GYkUkcNgIi8H8c3VSBovjOWs7B FGsiXjziOBb4vHifQ4zT+ZbPHMUbTFjMhuFZF7XEo8hTOcgkJoMn7iI888oBDaUmw+ tEcFZ0bAwQTiCaRKVQJyOzjDE4PNXsw1UGjEy/5M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Guilherme G. Piccoli" , Feng Tang , Luis Chamberlain , Kees Cook , Iurii Zaikin , Samuel Iglesias Gonsalvez , Andrew Morton , Linus Torvalds Subject: [PATCH 5.10 590/599] docs: sysctl/kernel: add missing bit to panic_print Date: Tue, 5 Apr 2022 09:34:44 +0200 Message-Id: <20220405070316.397977596@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070258.802373272@linuxfoundation.org> References: <20220405070258.802373272@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Guilherme G. Piccoli commit a1ff1de00db21ecb956213f046b79741b64c6b65 upstream. Patch series "Some improvements on panic_print". This is a mix of a documentation fix with some additions to the "panic_print" syscall / parameter. The goal here is being able to collect all CPUs backtraces during a panic event and also to enable "panic_print" in a kdump event - details of the reasoning and design choices in the patches. This patch (of 3): Commit de6da1e8bcf0 ("panic: add an option to replay all the printk message in buffer") added a new bit to the sysctl/kernel parameter "panic_print", but the documentation was added only in kernel-parameters.txt, not in the sysctl guide. Fix it here by adding bit 5 to sysctl admin-guide documentation. [rdunlap@infradead.org: fix table format warning] Link: https://lkml.kernel.org/r/20220109055635.6999-1-rdunlap@infradead.org Link: https://lkml.kernel.org/r/20211109202848.610874-1-gpiccoli@igalia.com Link: https://lkml.kernel.org/r/20211109202848.610874-2-gpiccoli@igalia.com Fixes: de6da1e8bcf0 ("panic: add an option to replay all the printk message in buffer") Signed-off-by: Guilherme G. Piccoli Reviewed-by: Feng Tang Cc: Luis Chamberlain Cc: Kees Cook Cc: Iurii Zaikin Cc: Samuel Iglesias Gonsalvez Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/sysctl/kernel.rst | 1 + 1 file changed, 1 insertion(+) --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -787,6 +787,7 @@ bit 1 print system memory info bit 2 print timer info bit 3 print locks info if ``CONFIG_LOCKDEP`` is on bit 4 print ftrace buffer +bit 5 print all printk messages in buffer ===== ============================================ So for example to print tasks and memory info on panic, user can::