Received: by 2002:a25:e7d8:0:0:0:0:0 with SMTP id e207csp23908ybh; Tue, 10 Mar 2020 18:27:25 -0700 (PDT) X-Google-Smtp-Source: ADFU+vsP7AA5uzL40ihippQRNqpQRQM0QPjaXW8n2pQPrzwfN/iOuamUyhMO8SSz9lc/QaLt4dYV X-Received: by 2002:a05:6808:289:: with SMTP id z9mr352334oic.48.1583890045579; Tue, 10 Mar 2020 18:27:25 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1583890045; cv=none; d=google.com; s=arc-20160816; b=Mn5a135GFsI906YX8DPReawro8YeuNSHfEanEWoJRa+SYsfVF4D55MVnZOw2K5WVdd m5KywPoETW6dTaa+SqiM+0ceVldsQvQLTHYa7xswDWgNeyfRdNBu2Q18XsjtCmg81i5L 7asymTRjn8ga241jmP44xeAiGLYRJGi34wV4RiO4zp6uiNR8kC05P3dRk+Ntq4exn3ge tPd2fEgtCtu3N0SboXLpW0MWzdXrhpo1ZZ6bHfXdJjIBPOFWTo04AD5q/mliPesfGKEr NTrkcijZv7DeWXCNS6ErP3IOENlHT9b5zU1ChoqYrOUPcjM9h4q/iKXTaf6PnCWEqYq4 K/Ug== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :dkim-signature; bh=Mtx75iMxjpk00GN1+prOMR5PivZ72A/O1DSErG3pjOU=; b=fSqQmt6wPIhv9ozmc7fRRCxwI4OwsEfmF19KGHU6MIEV7yvCu30yyAAP/jxbTMAfR7 ggAW6vbodSNmkhWxXzIV58QdqbNQ1uqItEFFRKwe1rZN2PZ7Zu0r6h35wlNFUSTQTC8w bt9sWX/lfSJ580/+fo+7QpCVdK7mrwCgLoAIUCt2qG+xqAI0aeQ7qGIDFhZA5OO44S/n DdRDkY68Q2kL73hfv/aB+rZOIJNP6looFS688r3yMRCB9jCoVRGjk3uY84eJ6Y46aVhK B7HxF2F8m5hxsAjwbYWTHLA4M2Q4OYs8adIR6OD58XJbtfT3jZQ1HaSRYAuiZBfnuCL+ IHXA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=T8TmCtDp; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l19si304032oii.54.2020.03.10.18.27.13; Tue, 10 Mar 2020 18:27:25 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=T8TmCtDp; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727915AbgCKB0s (ORCPT + 99 others); Tue, 10 Mar 2020 21:26:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:36192 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727528AbgCKB0s (ORCPT ); Tue, 10 Mar 2020 21:26:48 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9464D205ED; Wed, 11 Mar 2020 01:26:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583890008; bh=eMDYXR2nJZoF3367Sc7t4Lc1WZJdnWQnD5UrvNe19Jg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=T8TmCtDpE64khBhTPI+ccVAiSHhT0IlO0Loa/vazicprYilRGiHWoolabqja0dOCG j/KdC66zHZydqdJpoJhd8CY9CsR/jH2HoSgl7KI9Mr7x2JPZe7gbPkfN+8p0MZj062 iiRfYkMcoSbbzpqp/mg2jjNJZ3kZS3jGbGHWKzuw= Date: Tue, 10 Mar 2020 18:26:47 -0700 From: Andrew Morton To: Randy Dunlap Cc: "Guilherme G. Piccoli" , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, mcgrof@kernel.org, keescook@chromium.org, yzaikin@google.com, tglx@linutronix.de, kernel@gpiccoli.net Subject: Re: [PATCH] panic: Add sysctl/cmdline to dump all CPUs backtraces on oops event Message-Id: <20200310182647.59f6ea73aad3aca619065f1e@linux-foundation.org> In-Reply-To: <93f20e59-41b1-48ad-b0eb-e670b18994d5@infradead.org> References: <20200310163700.19186-1-gpiccoli@canonical.com> <93f20e59-41b1-48ad-b0eb-e670b18994d5@infradead.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 10 Mar 2020 13:59:15 -0700 Randy Dunlap wrote: > > +oops_all_cpu_backtrace: > > +================ > > + > > +Determines if kernel should NMI all CPUs to dump their backtraces when > > I would much prefer that to be written without using NMI as a verb. "Non maskably interrupt" ;) I think it's OK. Concise and the meaning is clear. Why do we need the kernel boot parameter? Isn't /proc/sys/kernel/oops_all_cpu_backtrace sufficient?