From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.6 required=5.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id C67127D043 for ; Wed, 30 May 2018 15:28:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753722AbeE3P2t (ORCPT ); Wed, 30 May 2018 11:28:49 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:52440 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753293AbeE3P2r (ORCPT ); Wed, 30 May 2018 11:28:47 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id D05366063F; Wed, 30 May 2018 15:28:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1527694126; bh=RkVT45p+OiOLLtk2DfC8yR0tNkvQ+jZddxKGv7G3Ju4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=a+Di5js8EFfpXgs271OwSZhF+pxZ8dFH4SPFRX+Aqk8fjzda204e4rG98kqGPum9Q H4RTcUWRcuZXQDu2ThGwwq89p8gnqZk42ngubgfdHlSbId3xswpwgPDpv2KeAQ3LY/ Np2W/aBywG8nJS3PYcOUZcuQlMYsrDZEyI6jCabQ= Received: from [10.235.228.150] (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id E9A5660452; Wed, 30 May 2018 15:28:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1527694125; bh=RkVT45p+OiOLLtk2DfC8yR0tNkvQ+jZddxKGv7G3Ju4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=bntbCM05Dy+R0MUx34nosHPtXd3Qa4jDktwXwEOMM3JTxtGdLNPM3caJpaxoh5Z/g VWTMfqm7PGivWD74BT/grdG65h2njf9s2OMjphk29WYmY1aar/fN1Z+FknTtNR+2XD xVWJAFRO0L4bdu8oy77PDYsT2Y8j0klMKoTUtbzw= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org E9A5660452 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=okaya@codeaurora.org Subject: Re: [PATCH] PCI: Add pci=safemode option To: Bjorn Helgaas Cc: Christoph Hellwig , Gabriele Paoloni , "open list:DOCUMENTATION" , linux-pci@vger.kernel.org, Keith Busch , Kai-Heng Feng , Ingo Molnar , Christoffer Dall , Jonathan Corbet , timur@codeaurora.org, "Rafael J. Wysocki" , Dongdong Liu , David Rientjes , Thymo van Beers , "Paul E. McKenney" , Frederick Lawler , Konrad Rzeszutek Wilk , Marc Zyngier , linux-arm-msm@vger.kernel.org, Frederic Weisbecker , Bjorn Helgaas , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Oza Pawandeep , Greg Kroah-Hartman , open list References: <1527650389-31575-1-git-send-email-okaya@codeaurora.org> <20180530043103.GA19734@kroah.com> <6c317ed8-cca3-8862-5f3b-12cf14e4d53b@codeaurora.org> <20180530073735.GA28793@infradead.org> <6dfe2db8f974d94c9867f30ec83d9333@codeaurora.org> <20180530145650.GA39853@bhelgaas-glaptop.roam.corp.google.com> From: Sinan Kaya Message-ID: <2a5281cd-a0c7-1449-5b72-133660667fa6@codeaurora.org> Date: Wed, 30 May 2018 11:28:42 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180530145650.GA39853@bhelgaas-glaptop.roam.corp.google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 5/30/2018 10:56 AM, Bjorn Helgaas wrote: > This *was* my idea, but I'm starting to think it was a bad idea. > > I don't want people to use pci= parameters as the normal way to get a > system to boot. That would be a huge support hassle (putting things > in release notes, diagnosing problems when people forget it, etc). > > But the parameters *are* useful for debugging. If we had a > "pci=safemode" and it avoided some problem, the next step would be to > narrow it down by using the more specific flags (pci=nomsi, pci=noari, > pci=no_ext_tags, etc). So I think 95% of the value is in the specific > flags, and a "pci=safemode" might add a little bit of value but at the > cost of a small but nagging maintenance concern and code clutter. OK. Let's try noXYZ feature. Can you enumerate the XYZ features that you want to see? -- Sinan Kaya Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html