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 X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C606BC2BA19 for ; Tue, 14 Apr 2020 11:25:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8315A206B6 for ; Tue, 14 Apr 2020 11:25:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8315A206B6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 091878E0003; Tue, 14 Apr 2020 07:25:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0184F8E0001; Tue, 14 Apr 2020 07:25:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E96EB8E0003; Tue, 14 Apr 2020 07:25:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0082.hostedemail.com [216.40.44.82]) by kanga.kvack.org (Postfix) with ESMTP id CD0E98E0001 for ; Tue, 14 Apr 2020 07:25:11 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 869F7181AEF0B for ; Tue, 14 Apr 2020 11:25:11 +0000 (UTC) X-FDA: 76706229222.21.ducks81_4a5a6bb52712d X-HE-Tag: ducks81_4a5a6bb52712d X-Filterd-Recvd-Size: 4359 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Tue, 14 Apr 2020 11:25:10 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 053E6AC61; Tue, 14 Apr 2020 11:25:07 +0000 (UTC) Subject: Re: [PATCH 1/3] kernel/sysctl: support setting sysctl parameters from kernel command line To: Luis Chamberlain , Kees Cook Cc: Iurii Zaikin , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Ivan Teterevkov , Michal Hocko , David Rientjes , Matthew Wilcox , "Eric W . Biederman" , "Guilherme G . Piccoli" , Alexey Dobriyan , Thomas Gleixner , Greg Kroah-Hartman , Christian Brauner , Masami Hiramatsu References: <20200330115535.3215-1-vbabka@suse.cz> <20200330115535.3215-2-vbabka@suse.cz> <20200330224422.GX11244@42.do-not-panic.com> <287ac6ae-a898-3e68-c7d8-4c1d17a40db9@suse.cz> <20200402160442.GA11244@42.do-not-panic.com> <202004021017.3A23B759@keescook> <20200402205932.GM11244@42.do-not-panic.com> <202004031654.C4389A04EF@keescook> <20200406140836.GA11244@42.do-not-panic.com> <202004060856.6BC17C5C99@keescook> <20200406170822.GE11244@42.do-not-panic.com> From: Vlastimil Babka Message-ID: <7585f0b0-c5d2-b527-aac7-eeafdd15ffad@suse.cz> Date: Tue, 14 Apr 2020 13:25:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200406170822.GE11244@42.do-not-panic.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 4/6/20 7:08 PM, Luis Chamberlain wrote: > On Mon, Apr 06, 2020 at 08:58:50AM -0700, Kees Cook wrote: >> On Mon, Apr 06, 2020 at 02:08:36PM +0000, Luis Chamberlain wrote: >> > > Yes. Doing an internal extension isn't testing the actual code. >> > >> > But it would. >> > >> > [...] >> > > I don't think anything is needed for this series. It can be boot tested >> > > manually. >> > >> > Why test it manually when it could be tested automatically with a new kconfig? >> >> So, my impression is that adding code to the internals to test the >> internals isn't a valid test (or at least makes it fragile) because the >> test would depend on the changes to the internals (or at least depend on >> non-default non-production CONFIGs). > > The *internal* aspect here is an extension to boot params under a > kconfig which would simply append to it, as if the user would have So there's no such kconfig yet to apply boot parameters specified by configure, right? That would itself be a new feature. Or could we use bootconfig? (CC Masami) > added some more params. Since we already have test sysctl params the > only one we'd need to add on the test driver would be a dummy one which > tests the alias, on the second patch. We should have enough sysctls to > already test dummy values. Right. > Nothing else would be needed as the sysctl test driver would just need > to test that the values expected when this is enabled is set. > >> Can you send a patch for what you think this should look like? Perhaps >> I'm not correctly imagining what you're describing? > > I rather get the person involved in the changes to do the testing so > as they're the ones designing the feature. If however it is not clear > what I mean I'm happy to elaborate. > > Vlastimil do you get what I mean? Hopefully :) >> Regardless of testing, I think this series is ready for -mm. > > I'm happy for it to go in provided we at least devise a follow up plan > for testing. Otherwise -- like other things, it won't get done. OK I'll send a v2 and we can discuss the test driver details. I don't want to neglect testing, but also not block the new functionality, in case it means testing means adding another new functionality. Thanks, Vlastimil > Luis >