From fusa-sig-bounces@lists.xenproject.org Wed Jun 01 20:31:38 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 01 Jun 2022 20:31:38 +0000 Received: from list by lists.xenproject.org with outflank-mailman.340779.565897 (Exim 4.92) (envelope-from ) id 1nwV0E-0004Ff-JJ; Wed, 01 Jun 2022 20:31:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 340779.565897; Wed, 01 Jun 2022 20:31:38 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nwV0E-0004Fc-GU; Wed, 01 Jun 2022 20:31:38 +0000 Received: by outflank-mailman (input) for mailman id 340779; Wed, 01 Jun 2022 20:27:51 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nwUwZ-0002ek-DO for fusa-sig@lists.xenproject.org; Wed, 01 Jun 2022 20:27:51 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 4d9f2572-e1e9-11ec-837f-e5687231ffcc; Wed, 01 Jun 2022 22:27:50 +0200 (CEST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 35869B81985; Wed, 1 Jun 2022 20:27:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 90DA0C385B8; Wed, 1 Jun 2022 20:27:45 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 4d9f2572-e1e9-11ec-837f-e5687231ffcc DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654115266; bh=mSmM2+7GRV4+/0dAzKlo87gel3iDbQlAbmki+vKiF6E=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=l8s3AkTdah2m0bxUpiOYsuMpbealnOFc9MRKhSmAhzJgncpSuS+YrstHaI3tss9eh ySf/GqGp5ACqr9yVQrJbe3vjkibWmeIrTWTOdOspBmG+HKjNyjreGQWztO36m7rFny aTOLsXElaW2vej4mbxsG1p6Ak7ncfQNAaBRJ5asxgBVEqGr+XHnHyJsW/i2sWcn1T1 muQ6YYgKBDbF0WDNVmHk9sO5N/pg32qcf2rFLDZIYKFW6WVXtMZP4pjuQ8i9RHO4Xi h12IDANhHsw6xCjpdTBbdzT/v6fGCF+cHUhTUsFArd9uJsrmwNXeIGkPmmOCnkX6Wt Dpyr83trwi2JA== Date: Wed, 1 Jun 2022 13:27:44 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Stefano Stabellini cc: George Dunlap , xen-devel , Roger Pau Monne , Artem Mygaiev , jbeulich@suse.com, Andrew.Cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, fusa-sig@lists.xenproject.org Subject: Re: MOVING COMMUNITY CALL Call for agenda items for 9 June Community Call @ 1500 UTC In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Reducing CC and adding fusa-sig Actually Jun 9 at 8AM California / 4PM UK doesn't work for some of you, so it is either: 1) Jun 9 at 7AM California / 3PM UK 2) Jun 14 at 8AM California / 4PM UK My preference is the first option because it is sooner but let me know if it doesn't work and we'll try the second option. On Wed, 1 Jun 2022, Stefano Stabellini wrote: > Hi all, > > I would like to suggest to have the MISRA C meeting just before the > community call (7AM California time). If it is difficult for any of the > must-have attendees, then I would like to ask to reserve 30 minutes of > the community call to make progress on MISRA. > > Cheers, > > Stefano > > > On Wed, 1 Jun 2022, George Dunlap wrote: > > Hi all, > > > > Sorry for sending this out so late; my calendar was screwed up. Due to it being a public holiday in the UK, I propose moving the monthly community call to NEXT THURSDAY, 9 June, same time. > > > > The proposed agenda is in https://cryptpad.fr/pad/#/2/pad/edit/URCDNNBOVKsEK2grXf2l954a/ and you can edit to add items. Alternatively, you can reply to this mail directly. > > > > Agenda items appreciated a few days before the call: please put your name besides items if you edit the document. > > > > Note the following administrative conventions for the call: > > * Unless, agreed in the pervious meeting otherwise, the call is on the 1st Thursday of each month at 1600 British Time (either GMT or BST) > > * I usually send out a meeting reminder a few days before with a provisional agenda > > > > * To allow time to switch between meetings, we'll plan on starting the agenda at 16:05 sharp. Aim to join by 16:03 if possible to allocate time to sort out technical difficulties &c > > > > * If you want to be CC'ed please add or remove yourself from the sign-up-sheet at https://cryptpad.fr/pad/#/2/pad/edit/D9vGzihPxxAOe6RFPz0sRCf+/ > > > > Best Regards > > George > > > > > > > > == Dial-in Information == > > ## Meeting time > > 15:00 - 16:00 UTC > > Further International meeting times: https://www.timeanddate.com/worldclock/meetingdetails.html?year=2022&month=06&day=9&hour=15&min=0&sec=0&p1=1234&p2=37&p3=224&p4=179 > > > > > > ## Dial in details > > Web: https://meet.jit.si/XenProjectCommunityCall > > > > Dial-in info and pin can be found here: > > > > https://meet.jit.si/static/dialInInfo.html?room=XenProjectCommunityCall > > > From fusa-sig-bounces@lists.xenproject.org Thu Jun 02 15:06:27 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 02 Jun 2022 15:06:27 +0000 Received: from list by lists.xenproject.org with outflank-mailman.340913.566331 (Exim 4.92) (envelope-from ) id 1nwmP4-0001cS-Vk; 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I don't think I was aware that another call is needed. Was that said somewhere earlier where I did miss it? In any event, either option looks to be okay here. Jan From fusa-sig-bounces@lists.xenproject.org Tue Jun 07 02:17:31 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 07 Jun 2022 02:17:31 +0000 Received: from list by lists.xenproject.org with outflank-mailman.342758.567823 (Exim 4.92) (envelope-from ) id 1nyOmg-00061T-7W; Tue, 07 Jun 2022 02:17:30 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 342758.567823; Tue, 07 Jun 2022 02:17:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nyOmg-00061Q-4j; Tue, 07 Jun 2022 02:17:30 +0000 Received: by outflank-mailman (input) for mailman id 342758; Tue, 07 Jun 2022 02:17:29 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nyOme-00061K-Ov for fusa-sig@lists.xenproject.org; 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boundary="_000_BY5PR02MB6724975C408270C31C93BDE4A0A59BY5PR02MB6724namp_" MIME-Version: 1.0 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY5PR02MB6724.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 31740643-6024-476b-d6a2-08da482bd843 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Jun 2022 02:17:17.4824 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: HFF1gAVYGRGmk/9IuM6DlvhV7Ik+MaVwvSZhGRbckFDT2qVZ8cXBq2aT5EDDcwRRx2muQMC7Xlw7+Ree0dIQUw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB4424 --_000_BY5PR02MB6724975C408270C31C93BDE4A0A59BY5PR02MB6724namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [https://st2.zoom.us/static/6.1.6656/image/new/ZoomLogo_110_25.png] Hi there, Stefano Stabellini is inviting you to a scheduled Zoom meeting. Join Zoom Meeting Phone one-tap: US: +16699006833,,94767630697# or +17209289299,,94767630697# Meeting URL: https://xilinx.zoom.us/j/94767630697?from=3Daddon Meeting ID: 947 6763 0697 Join by Telephone For higher quality, dial a number based on your current location. Dial: US: +1 669 900 6833 or +1 720 928 9299 or +1 929 205 6099 or 888 475 4499 (= Toll Free) or 833 548 0276 (Toll Free) or 833 548 0282 (Toll Free) or 877 8= 53 5257 (Toll Free) India: +91 22 48 798 004 or +91 224 879 8012 or +91 225 097 2742 or +91 225= 097 2743 or +91 225 097 2744 or +91 225 097 2745 or +91 226 480 2722 or +9= 1 22 71 279 525 or +91 406 480 2722 or +91 446 480 2722 or +91 806 480 2722= or +91 80 71 279 440 or +91 116 480 2722 or 000 800 050 5050 (Toll Free) o= r 000 800 001 4002 (Toll Free) Ireland: +353 6 163 9031 or +353 1 536 9320 or +353 1 653 3895 or 1800 949 = 238 (Toll Free) or 1800 901 561 (Toll Free) or 1800 943 965 (Toll Free) Singapore: +65 3165 1065 or +65 3158 7288 or 800 852 6054 (Toll Free) or 18= 00 407 5602 (Toll Free) or 800 101 3814 (Toll Free) Meeting ID: 947 6763 0697 International numbers Join from a Video Conference room system Meeting ID: 947 6763 0697 US: 94767630697@global.zoomcrc.com APAC: 94767630697@global.zoomcrc.com India: 94767630697@global.zoomcrc.com Europe: 94767630697@global.zoomcrc.com SIP: 94767630697@zoomcrc.com --_000_BY5PR02MB6724975C408270C31C93BDE4A0A59BY5PR02MB6724namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 
Hi there,
Stefano St= abellini is inviting you to a scheduled Zoom meeting.
Join Zoom Mee= ting
= Phone one-tap: US: = +16699006833,,94767630697# or +17209289299,,94767630697#
= Meeting URL: https://xilinx.zoom.us/j/94767630697?= from=3Daddon
Meeting ID: 947 6763 0697
Join by Telephone
For higher quality, dial a number based on your current location.
Dial:
US: +1 669 900 6833 or +1 720 928 9299 or +1 929 205 6099 or 888 475 4499 (= Toll Free) or 833 548 0276 (Toll Free) or 833 548 0282 (Toll Free) or 877 8= 53 5257 (Toll Free)
India: +91 22 48 798 004 or +91 224 879 8012 or +91 225 097 2742 or +91 225= 097 2743 or +91 225 097 2744 or +91 225 097 2745 or +91 226 480 2722 or +9= 1 22 71 279 525 or +91 406 480 2722 or +91 446 480 2722 or +91 806 480 2722= or +91 80 71 279 440 or +91 116 480 2722 or 000 800 050 5050 (Toll Free) or 000 800 001 4002 (Toll Free) Ireland: +353 6 163 9031 or +353 1 536 9320 or +353 1 653 3895 or 1800 949 = 238 (Toll Free) or 1800 901 561 (Toll Free) or 1800 943 965 (Toll Free)
Singapore: +65 3165 1065 or +65 3158 7288 or 800 852 6054 (Toll Free) or 18= 00 407 5602 (Toll Free) or 800 101 3814 (Toll Free)
Meeting ID: 947 6763 0697
International numbers
Join from a Video Conference room system
Meeting ID: 947 6763 0697
US: 94767630697@global.zoomcrc.com
APAC: 94767630697@global.zoomcrc.com
India: 94767630697@global.zoomcrc.com
Europe: 94767630697@global.zoomcrc.com
SIP: 94767630697@zoomcrc.com
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ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3753FB81826; Tue, 7 Jun 2022 02:17:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63F31C385A9; Tue, 7 Jun 2022 02:17:39 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 02586f3a-e608-11ec-b605-df0040e90b76 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654568259; bh=G/OCd3vUJTb9gQkavsuraROzp2lGVfO55Ao2rS3VQyI=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=nt/BJoBK32hpV9/IJ00L7dUSCo7085TNhohCvxlbhKm6+KIShSjGTJqukogik0n0b zqd/x/sZBHRn78JPmXY7tm4LQJ5adY9BCnR4C6+IlZ0MjxAuVsNKWGxotM4gD82kn9 uD6WWT0csXljZp0pvMHyf3fj0qrG0umqfMy6fstSGW6WVcU2Z14Qb0FtscV0HtMPjd 0nxo5r5aDgp2tDh0LtJyy+Md/noSR3HFJMJlmPOEoYt5d9Hg3R+LBH18CF9qD+iqdP MXoNcRV6wJO/N5vEmkcLrqwWm5iqMgqU3S5a54cK/g3oGI1KGLOFw3Owumqob7I3+h FJR/0Xj/iQLqg== Date: Mon, 6 Jun 2022 19:17:38 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Jan Beulich cc: Stefano Stabellini , George Dunlap , xen-devel , Roger Pau Monne , Artem Mygaiev , Andrew.Cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, fusa-sig@lists.xenproject.org, roberto.bagnara@bugseng.com Subject: Re: MOVING COMMUNITY CALL Call for agenda items for 9 June Community Call @ 1500 UTC In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Thu, 2 Jun 2022, Jan Beulich wrote: > On 01.06.2022 22:27, Stefano Stabellini wrote: > > Reducing CC and adding fusa-sig > > > > Actually Jun 9 at 8AM California / 4PM UK doesn't work for some of you, > > so it is either: > > 1) Jun 9 at 7AM California / 3PM UK > > 2) Jun 14 at 8AM California / 4PM UK > > > > My preference is the first option because it is sooner but let me know > > if it doesn't work and we'll try the second option. > > I don't think I was aware that another call is needed. Was that said > somewhere earlier where I did miss it? In any event, either option > looks to be okay here. I sent out the meeting invite for Jun 9 at 7AM California / 3PM UK. Just a reminder to fill in the remaining "yellow" rules of the spreadsheet in advance of the meeting. There are couple of interesting questions on the remaining rules, which I tried to shed some light on. # Rule 9.1 "The value of an object with automatic storage duration shall not be read before it has been set" The question is whether -Wuninitalised already covers this case or not. I think it does. Eclair is reporting a few issues where variables are "possibly uninitialized". We should ask Roberto about them, I don't think they are actual errors? More like extra warnings? # Rule 9.3 "Arrays shall not be partially initialized" Andrew was pointing out that "we use implicit 0's all over the place". That is true but as far as I can tell that is permitted. There is a couple of exceptions to the rules: - { 0 } is allowed - sparse initialization using designated initializers is allowed e.g. char ar[3] = { [2] = 'c' } So I think we are fine there. # Rule 9.4 "An element of an object shall not be initialized more than once" Andrew was noting that "There's one pattern using range syntax to set a default where this rule would be violated, but the code is far cleaner to read." Range initializers is a GCC extension not part of the C standard. It is not considered by the MISRA rule. The MISRA rule seems focused on preveting accidental double-initializations (by copy/pasting errors for instance) which is fair. So I think we should be OK here and we need to clarify our usage of range initializers. What we do or don't do with range initializer should be a separate discussion I think. 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I'm actually not sure we have such uses, as I seem to vaguely recall clang warning about them. Off the top of your head, do you know of an instance, Andrew? Jan > Range initializers is a GCC extension not part of the C standard. It is > not considered by the MISRA rule. The MISRA rule seems focused on > preveting accidental double-initializations (by copy/pasting errors for > instance) which is fair. > > So I think we should be OK here and we need to clarify our usage of > range initializers. What we do or don't do with range initializer should > be a separate discussion I think. > From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 01:22:34 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 01:22:34 +0000 Received: from list by lists.xenproject.org with outflank-mailman.344514.570063 (Exim 4.92) (envelope-from ) id 1nz6sc-0007zN-OL; Thu, 09 Jun 2022 01:22:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 344514.570063; Thu, 09 Jun 2022 01:22:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nz6sc-0007zK-Li; Thu, 09 Jun 2022 01:22:34 +0000 Received: by outflank-mailman (input) for mailman id 344514; Thu, 09 Jun 2022 01:20:11 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nz6qJ-0007NJ-LU for fusa-sig@lists.xenproject.org; Thu, 09 Jun 2022 01:20:11 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 4d65b898-e792-11ec-b605-df0040e90b76; Thu, 09 Jun 2022 03:20:10 +0200 (CEST) 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 ams.source.kernel.org (Postfix) with ESMTPS id C2CF7B82B96; Thu, 9 Jun 2022 01:20:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F06F5C34116; Thu, 9 Jun 2022 01:20:06 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 4d65b898-e792-11ec-b605-df0040e90b76 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654737607; bh=d+DLiXwlbjDMXCSdYRfGavyNvyx6xU4i4BT1aAY1rBQ=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=aDr4OzrBoPV+1QLWdfgKDwbYQB0biEJJF3dWK6mDAd14CHqYk1Vls0HA2GsLfpKjW +a7SKQF2jP4QJETYBg/YamTNQ5EqQIlIH6br+YsSUqnDkGEW0C0veORkZbUyNhVKRK qgllxt4Zjnt6n44zQC6hCfAwB1JT/g/8HG0Pr/wLR3JZh0wigNrcbS5AKAZu+VdD63 JX/g0A2haxZV4mj51ocoqfqpOFpHjsWM0ETybpk24ONTY/ru1eT6Z2hf1DtDByAmxQ GJizPnIDe1nMBQ6YiRNY147iZlUXx/MyoHVXupgx+Imda7TlTaU8/91UfaaW7T8wD/ 17Zz68ikP5E3g== Date: Wed, 8 Jun 2022 18:20:06 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Stefano Stabellini cc: Jan Beulich , George Dunlap , xen-devel , Roger Pau Monne , Artem Mygaiev , Andrew.Cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, fusa-sig@lists.xenproject.org, roberto.bagnara@bugseng.com Subject: MISRA C meeting tomorrow, was: MOVING COMMUNITY CALL Call for agenda items for 9 June Community Call @ 1500 UTC In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Hi all, Just a quick note to have another look at the spreadsheet before the meeting tomorrow. I cleared the old rules we have already discussed leaving only the ones to discuss next. A few rules are similar to the already accepted Rule 5.1 with our agreed 40 characters limit for identifiers: - Rule 5.2 - Rule 5.4 A couple of rules are about comparisons/operations between pointers to different objects: - Rule 18.1 - Rule 18.2 - Rule 18.3 In my opinion these rules are good in the general case. Things like _end - _start and other "fake objects" should be deviations. A few rules weren't clear: - Rule 13.1, the example link was wrong, I updated it - Rule 9.3, { 0 } is allowed by the rule and also { [2] = 1 } is allowed - Rule 9.4, range initializers are not considered by the rule because they are a GNU extension Finally, for Rule 13.2, I updated the link to ECLAIR's results. There are a lot more violations than just 4, but I don't know if they are valid or false positives. Looking forward to our discussion tomorrow! Cheers, Stefano From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 08:14:38 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 08:14:38 +0000 Received: from list by lists.xenproject.org with outflank-mailman.344692.570345 (Exim 4.92) (envelope-from ) id 1nzDJO-00070V-R2; Thu, 09 Jun 2022 08:14:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 344692.570345; Thu, 09 Jun 2022 08:14:38 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzDJO-00070S-O6; Thu, 09 Jun 2022 08:14:38 +0000 Received: by outflank-mailman (input) for mailman id 344692; Thu, 09 Jun 2022 07:05:02 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzCE2-0004ga-Si for fusa-sig@lists.xenproject.org; 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There > are a lot more violations than just 4, but I don't know if they are > valid or false positives. I've picked just the one case in xen/common/efi/ebmalloc.c to check, and it says "possibly". That's because evaluation of function call arguments involves the calling of (in this case two) further functions. If those functions had side effects (which apparently the tool can't figure), there would indeed be a problem. The (Arm based) count of almost 10k violations is clearly a concern. I don't consider it even remotely reasonable to add 10k comments, no matter how brief, to cover all the false positives. Jan From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 13:55:34 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 13:55:34 +0000 Received: from list by lists.xenproject.org with outflank-mailman.345059.571156 (Exim 4.92) (envelope-from ) id 1nzIdK-0008JC-78; Thu, 09 Jun 2022 13:55:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 345059.571156; Thu, 09 Jun 2022 13:55:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzIdK-0008J9-3Z; Thu, 09 Jun 2022 13:55:34 +0000 Received: by outflank-mailman (input) for mailman id 345059; Thu, 09 Jun 2022 11:11:13 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzG4H-0002dm-CV for fusa-sig@lists.xenproject.org; Thu, 09 Jun 2022 11:11:13 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id de3ecbb3-e7e4-11ec-bd2c-47488cf2e6aa; Thu, 09 Jun 2022 13:11:12 +0200 (CEST) Received: from [192.168.1.137] (host-82-59-248-251.retail.telecomitalia.it [82.59.248.251]) by support.bugseng.com (Postfix) with ESMTPSA id 7FDC44EE0CDD; Thu, 9 Jun 2022 13:11:09 +0200 (CEST) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: de3ecbb3-e7e4-11ec-bd2c-47488cf2e6aa Message-ID: <45c4d8fa-06de-b4a2-5688-14b9cbe5b48c@bugseng.com> Date: Thu, 9 Jun 2022 13:11:08 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050929 Thunderbird/1.0.7 Fedora/1.0.7-1.1.fc4 Mnenhy/0.7.3.0 Subject: Re: MOVING COMMUNITY CALL Call for agenda items for 9 June Community Call @ 1500 UTC Content-Language: en-US To: Stefano Stabellini , Jan Beulich Cc: George Dunlap , xen-devel , Roger Pau Monne , Artem Mygaiev , Andrew.Cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, fusa-sig@lists.xenproject.org References: From: Roberto Bagnara In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07/06/22 04:17, Stefano Stabellini wrote: > # Rule 9.1 "The value of an object with automatic storage duration shall not be read before it has been set" > > The question is whether -Wuninitalised already covers this case or not. > I think it does. > > Eclair is reporting a few issues where variables are "possibly > uninitialized". We should ask Roberto about them, I don't think they are > actual errors? More like extra warnings? No, -Wuninitialized is not reliable, as it has plenty of (well known) false negatives. This is typical of compilers, for which the generation of warnings is only a secondary objective. I wrote about that here: https://www.bugseng.com/blog/compiler-warnings-use-them-dont-trust-them On the specifics: $ cat p.c int foo (int b) { int a; if (b) { a = 1; } return a; } $ gcc -c -W -Wall -Wmaybe-uninitialized -O3 p.c $ gcc -c -W -Wall -Wuninitialized -O3 p.c $ Note that the example is less contrived than you might think. See, JF Bastien's talk at 2019 LLVM Developers' Meeting: https://www.youtube.com/watch?v=I-XUHPimq3o More generally, you can only embrace MISRA if you agree on its preventive nature, which is radically different from the "bug finding" approach. The point is rather simple: 1) static analysis alone cannot guarantee correctness; 2) peer review is unavoidable; 3) testing is unavoidable. In order to effectively conduct a peer review, you cannot afford being distracted every minute by the thought "is this initialized? where is it initialized? with which value is it initialized?" In a MISRA setting, you want that the answer to such questions is immediately clear to anyone. In contrast, if you embrace bug finding (that is, checkers with false negatives like the ones implemented by compilers), you will miss instances that you may miss also with testing (testing a program with UB does not give reliable results); and you will likely miss them with peer review, unless you can spend a lot of time and resources in the activity. The checker implemented by ECLAIR for Rule 9.1 embodies this principle: if it says "violation", then it is a definite violation; if it says "caution", then maybe there is no UB, but a human will have to spend more than 30 seconds in order to convince herself that there is no UB. I understand this may sound frustrating to virtuoso programmers, and there are many of them in the open source world. But the truth is that virtuosity in programming is not a good thing for safety-related development. For safety you want code that is simple and straightforward to reason about. Kind regards, Roberto From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 13:55:34 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 13:55:34 +0000 Received: from list by lists.xenproject.org with outflank-mailman.345072.571158 (Exim 4.92) (envelope-from ) id 1nzIdK-0008JS-8o; Thu, 09 Jun 2022 13:55:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 345072.571158; Thu, 09 Jun 2022 13:55:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzIdK-0008JI-4S; Thu, 09 Jun 2022 13:55:34 +0000 Received: by outflank-mailman (input) for mailman id 345072; Thu, 09 Jun 2022 11:17:49 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzGAf-0003Wb-Lo for fusa-sig@lists.xenproject.org; Thu, 09 Jun 2022 11:17:49 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id cac58179-e7e5-11ec-bd2c-47488cf2e6aa; Thu, 09 Jun 2022 13:17:47 +0200 (CEST) Received: from [192.168.1.137] (host-82-59-248-251.retail.telecomitalia.it [82.59.248.251]) by support.bugseng.com (Postfix) with ESMTPSA id 9EA634EE0CDD; Thu, 9 Jun 2022 13:17:46 +0200 (CEST) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: cac58179-e7e5-11ec-bd2c-47488cf2e6aa Message-ID: <26829bf4-bbcc-a610-ba3b-fa60aa296cf9@bugseng.com> Date: Thu, 9 Jun 2022 13:17:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050929 Thunderbird/1.0.7 Fedora/1.0.7-1.1.fc4 Mnenhy/0.7.3.0 Subject: Re: MISRA C meeting tomorrow, was: MOVING COMMUNITY CALL Call for agenda items for 9 June Community Call @ 1500 UTC Content-Language: en-US To: Jan Beulich , Stefano Stabellini Cc: George Dunlap , xen-devel , Roger Pau Monne , Artem Mygaiev , Andrew.Cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, fusa-sig@lists.xenproject.org, roberto.bagnara@bugseng.com References: <880f3273-f92b-2b60-8de0-e69fefbada21@suse.com> From: Roberto Bagnara In-Reply-To: <880f3273-f92b-2b60-8de0-e69fefbada21@suse.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 09/06/22 09:04, Jan Beulich wrote: > On 09.06.2022 03:20, Stefano Stabellini wrote: >> Finally, for Rule 13.2, I updated the link to ECLAIR's results. There >> are a lot more violations than just 4, but I don't know if they are >> valid or false positives. > > I've picked just the one case in xen/common/efi/ebmalloc.c to check, > and it says "possibly". That's because evaluation of function call > arguments involves the calling of (in this case two) further > functions. If those functions had side effects (which apparently the > tool can't figure), there would indeed be a problem. > > The (Arm based) count of almost 10k violations is clearly a concern. > I don't consider it even remotely reasonable to add 10k comments, no > matter how brief, to cover all the false positives. Again, the MISRA approach is a preventive one. If you have reasons you want to write f(g(), h()); then declare g() and h() as pure (or const, if they are const). E.g.: #if COMPILER_SUPPORTS_PURE #define PURE __attribute__((pure)) #else #define PURE #endif int g(void) PURE; int h(void) PURE; It's good documentation, it improves compiler diagnostics, and it satisfies Rule 13.2. Kind regards, Roberto From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 13:55:34 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 13:55:34 +0000 Received: from list by lists.xenproject.org with outflank-mailman.345093.571163 (Exim 4.92) (envelope-from ) id 1nzIdK-0008Jh-Ey; Thu, 09 Jun 2022 13:55:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 345093.571163; Thu, 09 Jun 2022 13:55:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzIdK-0008JR-63; Thu, 09 Jun 2022 13:55:34 +0000 Received: by outflank-mailman (input) for mailman id 345093; Thu, 09 Jun 2022 11:24:07 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzGGl-0005oh-Tz for fusa-sig@lists.xenproject.org; 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We should ask Roberto about them, I don't think they are > > actual errors? More like extra warnings? > > No, -Wuninitialized is not reliable, as it has plenty of (well known) > false negatives. This is typical of compilers, for which the generation > of warnings is only a secondary objective. I wrote about that here: > > https://www.bugseng.com/blog/compiler-warnings-use-them-dont-trust-them > > On the specifics: > > $ cat p.c > int foo (int b) > { > int a; > > if (b) > { > a = 1; > } > > return a; > } > > $ gcc -c -W -Wall -Wmaybe-uninitialized -O3 p.c > $ gcc -c -W -Wall -Wuninitialized -O3 p.c > $ > > Note that the example is less contrived than you might think. > See, JF Bastien's talk at 2019 LLVM Developers' Meeting: > > https://www.youtube.com/watch?v=I-XUHPimq3o > > More generally, you can only embrace MISRA if you agree on > its preventive nature, which is radically different from > the "bug finding" approach. The point is rather simple: > > 1) static analysis alone cannot guarantee correctness; > 2) peer review is unavoidable; > 3) testing is unavoidable. > > In order to effectively conduct a peer review, you cannot > afford being distracted every minute by the thought > "is this initialized? where is it initialized? with which > value is it initialized?" > In a MISRA setting, you want that the answer to such questions > is immediately clear to anyone. > In contrast, if you embrace bug finding (that is, checkers with > false negatives like the ones implemented by compilers), > you will miss instances that you may miss also with testing > (testing a program with UB does not give reliable results); > and you will likely miss them with peer review, unless you > can spend a lot of time and resources in the activity. > > The checker implemented by ECLAIR for Rule 9.1 embodies this > principle: if it says "violation", then it is a definite > violation; if it says "caution", then maybe there is no > UB, but a human will have to spend more than 30 seconds > in order to convince herself that there is no UB. > > I understand this may sound frustrating to virtuoso programmers, > and there are many of them in the open source world. > But the truth is that virtuosity in programming is not a good > thing for safety-related development. For safety you want > code that is simple and straightforward to reason about. I understand what you're saying, yet I'd like to point out that adding initializers "blindly" may give a false sense of code correctness. Among other things it takes away the chance for tools to point out possible issues. Plus some tools warn about stray initializers ... Jan From fusa-sig-bounces@lists.xenproject.org Thu Jun 09 13:55:34 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 09 Jun 2022 13:55:34 +0000 Received: from list by lists.xenproject.org with outflank-mailman.345309.571167 (Exim 4.92) (envelope-from ) id 1nzIdK-0008Kp-HK; Thu, 09 Jun 2022 13:55:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 345309.571167; Thu, 09 Jun 2022 13:55:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzIdK-0008KB-9t; Thu, 09 Jun 2022 13:55:34 +0000 Received: by outflank-mailman (input) for mailman id 345309; Thu, 09 Jun 2022 12:17:05 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nzH61-0004iH-FG for fusa-sig@lists.xenproject.org; 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boundary="Apple-Mail=_E84EEBFA-12A4-4474-989F-9003B89B2E08"; protocol="application/pgp-signature"; micalg=pgp-sha256 MIME-Version: 1.0 X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH0PR03MB5669.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 263902de-a979-40c9-0490-08da4a11f2b2 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Jun 2022 12:16:57.2373 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: +K5m30vCVW6LWSoz5ODzGYKnVOOVxauU8GDGWOmRj3gnSlq29KX90o7r+4hOOwIfzJhFKcwvIdhtBgB5jJaM5ahS9piZCKFAjxMKKBRY158= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN4PR03MB6784 --Apple-Mail=_E84EEBFA-12A4-4474-989F-9003B89B2E08 Content-Type: multipart/alternative; boundary="Apple-Mail=_6AA87F33-84D6-45EB-9BE4-89565F3D7D43" --Apple-Mail=_6AA87F33-84D6-45EB-9BE4-89565F3D7D43 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 9 Jun 2022, at 12:24, Jan Beulich wrote: >=20 > On 09.06.2022 13:11, Roberto Bagnara wrote: >> On 07/06/22 04:17, Stefano Stabellini wrote: >>> # Rule 9.1 "The value of an object with automatic storage duration = shall not be read before it has been set" >>>=20 >>> The question is whether -Wuninitalised already covers this case or = not. >>> I think it does. >>>=20 >>> Eclair is reporting a few issues where variables are "possibly >>> uninitialized". We should ask Roberto about them, I don't think they = are >>> actual errors? More like extra warnings? >>=20 >> No, -Wuninitialized is not reliable, as it has plenty of (well known) >> false negatives. This is typical of compilers, for which the = generation >> of warnings is only a secondary objective. I wrote about that here: >>=20 >> = https://www.bugseng.com/blog/compiler-warnings-use-them-dont-trust-them >>=20 >> On the specifics: >>=20 >> $ cat p.c >> int foo (int b) >> { >> int a; >>=20 >> if (b) >> { >> a =3D 1; >> } >>=20 >> return a; >> } >>=20 > I understand what you're saying, yet I'd like to point out that adding > initializers "blindly" may give a false sense of code correctness. > Among other things it takes away the chance for tools to point out > possible issues. Plus some tools warn about stray initializers ... Right =E2=80=94 if you always set =E2=80=9Cint a=3D0;=E2=80=9D, then = you=E2=80=99re getting a known value; but if your algorithm relies on it = being something specific (and not zero), then it=E2=80=99s not clear the = resulting software is actually more reliable. If you don=E2=80=99t = initialise it, there=E2=80=99s at least a chance the compiler will be = able to tell you that you made a mistake; if you explicitly initialise = it, then it=E2=80=99s all on you. -George --Apple-Mail=_6AA87F33-84D6-45EB-9BE4-89565F3D7D43 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On 9 Jun 2022, at 12:24, Jan Beulich <jbeulich@suse.com> = wrote:

On 09.06.2022 13:11, Roberto Bagnara wrote:
On = 07/06/22 04:17, Stefano Stabellini wrote:
# Rule 9.1 "The value of an object with = automatic storage duration shall not be read before it has been set"

The question is whether -Wuninitalised already = covers this case or not.
I think it does.

Eclair is reporting a few issues where variables are = "possibly
uninitialized". We should ask Roberto about = them, I don't think they are
actual errors? More like = extra warnings?

No, = -Wuninitialized is not reliable, as it has plenty of (well known)
false negatives. This is typical of compilers, for which the = generation
of warnings is only a secondary objective. I = wrote about that here:

https://www.bugseng.com/blog/compiler-warnings-use-them-dont-tr= ust-them

On the specifics:

$ cat p.c
int foo (int b)
{
int a;

if (b)
{
a =3D 1;
}

return a;
}


I understand what you're saying, yet I'd like to point out = that adding
initializers "blindly" may give a false sense of code = correctness.
Among other things it takes away the chance for tools to = point out
possible issues. Plus some tools warn about stray = initializers ...

Right =E2=80=94 if you always set =E2=80=9Cint = a=3D0;=E2=80=9D, then you=E2=80=99re getting a known value; but if your = algorithm relies on it being something specific (and not zero), then = it=E2=80=99s not clear the resulting software is actually more reliable. =  If you don=E2=80=99t initialise it, there=E2=80=99s at least a = chance the compiler will be able to tell you that you made a mistake; if = you explicitly initialise it, then it=E2=80=99s all on you.

 -George
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There >>> are a lot more violations than just 4, but I don't know if they are >>> valid or false positives. >> >> I've picked just the one case in xen/common/efi/ebmalloc.c to check, >> and it says "possibly". That's because evaluation of function call >> arguments involves the calling of (in this case two) further >> functions. If those functions had side effects (which apparently the >> tool can't figure), there would indeed be a problem. >> >> The (Arm based) count of almost 10k violations is clearly a concern. >> I don't consider it even remotely reasonable to add 10k comments, no >> matter how brief, to cover all the false positives. > > Again, the MISRA approach is a preventive one. > If you have reasons you want to write > > f(g(), h()); > > then declare g() and h() as pure (or const, if they are const). > E.g.: > > #if COMPILER_SUPPORTS_PURE > #define PURE __attribute__((pure)) > #else > #define PURE > #endif > > int g(void) PURE; > int h(void) PURE; > > It's good documentation, it improves compiler diagnostics, > and it satisfies Rule 13.2. But such attributes first of all should be correct. They wouldn't be in the case I've looked at (involving two __virt_to_maddr() invocations), as the underlying va_to_par() isn't pure. Still in the normal case the sequence of calls made is irrelevant to the overall result. As to improving compiler diagnostics: It has been my experience that pure and const are largely ignored when used on inline functions. The compiler rather looks at the inline-expanded code to judge. (But it has been a couple of years back that I last checked, so things may have changed since then.) Jan From fusa-sig-bounces@lists.xenproject.org Tue Jun 14 22:47:29 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Tue, 14 Jun 2022 22:47:29 +0000 Received: from list by lists.xenproject.org with outflank-mailman.349461.575563 (Exim 4.92) (envelope-from ) id 1o1FJo-0000ws-Pc; Tue, 14 Jun 2022 22:47:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 349461.575563; Tue, 14 Jun 2022 22:47:28 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1FJo-0000wp-Mq; Tue, 14 Jun 2022 22:47:28 +0000 Received: by outflank-mailman (input) for mailman id 349461; Tue, 14 Jun 2022 22:47:27 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1FJn-0000wj-5V for fusa-sig@lists.xenproject.org; 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client-ip=149.199.62.198; helo=xsj-pvapexch01.xlnx.xilinx.com; pr=C Date: Tue, 14 Jun 2022 15:47:12 -0700 From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: CC: , , , , , , , Subject: deviations tagging Message-ID: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 337395ec-5adf-4619-fb57-08da4e57d44c X-MS-TrafficTypeDiagnostic: BYAPR02MB4325:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:149.199.62.198;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:xsj-pvapexch01.xlnx.xilinx.com;PTR:unknown-62-198.xilinx.com;CAT:NONE;SFS:(13230016)(7916004)(4636009)(36840700001)(40470700004)(46966006)(7116003)(7636003)(9686003)(44832011)(2906002)(47076005)(5660300002)(426003)(356005)(508600001)(9786002)(8936002)(6916009)(26005)(36860700001)(33716001)(82310400005)(3480700007)(316002)(336012)(40460700003)(186003)(54906003)(70206006)(8676002)(70586007)(83380400001)(4326008);DIR:OUT;SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jun 2022 22:47:15.6032 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 337395ec-5adf-4619-fb57-08da4e57d44c X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: BN1NAM02FT022.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB4325 Hi all, Roberto was suggesting to use the following different categories for tagging deviations. We could pick any "TAG" we like for the in-code comments (or other tagging systems). I am also CCing the MISRA C team to give them early visibility on this. Feel free to provide early feedback if you have any. The plan is to discuss it further during the next fusa-sig call and come up with a more detailed proposal (including the actual tags, how to use them and more) for xen-devel next. Cheers, Stefano adopted The report should be considered originated by adopted code without any contribution of native code to the report. safe The report is correct but the specific behavior is safe under every aspect assumed to be covered by the guideline. relied The report is correct but the rule concerns exclusively "developer confusion" or readability matters that are not relevant for adopted code, which is assumed to work as is and it is not meant to be read, reviewed or modified by human programmers. To be used for adopted code only. false-positive In the opinion of the developer the violation report is not correct and the problem has been notified to the tool provider. To be used only for violation reports. compliant The developer can prove that the possible non-compliance shown by caution report cannot happen in any situation and can motivate such claim. To be used only for caution reports. false-negative The developer has found a non-compliance not shown by the tool and the problem has been notified to the tool provider. 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We could pick any "TAG" we like for the in-code > comments (or other tagging systems). > > I am also CCing the MISRA C team to give them early visibility on this. > Feel free to provide early feedback if you have any. The plan is to > discuss it further during the next fusa-sig call and come up with a more > detailed proposal (including the actual tags, how to use them and more) > for xen-devel next. And as early feedback: They all look like they're meant to be used together with some rule reference (or else there's insufficient context to know what is being talked about). Yet iirc we said we'd want tool- agnostic tags, such that the same kind of comments can also be used to mark e.g. things Coverity has found and we have decided to leave alone. Jan > adopted > > The report should be considered originated by adopted code without any > contribution of native code to the report. > > safe > > The report is correct but the specific behavior is safe under every > aspect assumed to be covered by the guideline. > > relied > > The report is correct but the rule concerns exclusively "developer > confusion" or readability matters that are not relevant for adopted code, > which is assumed to work as is and it is not meant to be read, reviewed > or modified by human programmers. To be used for adopted code only. > > false-positive > > In the opinion of the developer the violation report is not correct > and the problem has been notified to the tool provider. > To be used only for violation reports. > > compliant > > The developer can prove that the possible non-compliance shown by > caution report cannot happen in any situation and can motivate such > claim. To be used only for caution reports. > > false-negative > > The developer has found a non-compliance not shown by the tool and the > problem has been notified to the tool provider. > From fusa-sig-bounces@lists.xenproject.org Wed Jun 15 16:04:51 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Wed, 15 Jun 2022 16:04:51 +0000 Received: from list by lists.xenproject.org with outflank-mailman.349763.576519 (Exim 4.92) (envelope-from ) id 1o1VVj-0006jI-QY; Wed, 15 Jun 2022 16:04:51 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 349763.576519; Wed, 15 Jun 2022 16:04:51 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1VVj-0006j3-IF; Wed, 15 Jun 2022 16:04:51 +0000 Received: by outflank-mailman (input) for mailman id 349763; Wed, 15 Jun 2022 08:45:16 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1OeK-0007Ml-Gi for fusa-sig@lists.xenproject.org; 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While (assuming the file holding the justifications is meant to live in xen.git) conflicts on that file would guarantee uniqueness of the number, such conflicts would likely be frequent and require manual resolution every single time. Such conflicts could appear as late as when a patch is being committed, making the committers' (supposedly entirely mechanical) job harder (besides perhaps requiring quite a bit more re-basing effort by the submitter). 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boundary="Apple-Mail=_911E660B-4686-421D-A407-A3304F020FAF"; protocol="application/pgp-signature"; micalg=pgp-sha256 MIME-Version: 1.0 X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PH0PR03MB5669.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c80cf103-3636-4199-ee8c-08da4eb38488 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jun 2022 09:43:35.5713 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: NgZpwkjGsuDPYPeW8tukY3Yhgp9ecNYfxbEcLBI7Q4pzaF5pcUsb8k+bxhEHbBY22gTsOciVrbCClqKrUOH/1ieK0Xut/2aVptMKGxL3buM= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR03MB5322 --Apple-Mail=_911E660B-4686-421D-A407-A3304F020FAF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 14 Jun 2022, at 23:47, Stefano Stabellini = wrote: >=20 > Hi all, >=20 > Roberto was suggesting to use the following different categories for > tagging deviations. We could pick any "TAG" we like for the in-code > comments (or other tagging systems). >=20 > I am also CCing the MISRA C team to give them early visibility on = this. > Feel free to provide early feedback if you have any. The plan is to > discuss it further during the next fusa-sig call and come up with a = more > detailed proposal (including the actual tags, how to use them and = more) > for xen-devel next. >=20 > Cheers, >=20 > Stefano >=20 >=20 >=20 > adopted >=20 > The report should be considered originated by adopted code without = any > contribution of native code to the report. What do =E2=80=9Cadopted code=E2=80=9D and =E2=80=9Cnative code=E2=80=9D = mean in this context? -George --Apple-Mail=_911E660B-4686-421D-A407-A3304F020FAF Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEj3+7SZ4EDefWZFyCshXHp8eEG+0FAmKpqcYACgkQshXHp8eE G+0kHQf/et5rP6U/ii5oMxJnnudPh72bxmevoPjoPQm2ocNQA35llpSbXHyp8Bok 34MIghl7uzz6cWLNSfuTMUYbpjtrCA0bRnh1dh9jNLBz4lZr/K0bLC7QyxmV0Bo0 TRKK5Svp0blSmtAHguefJvOWL2nWQvly8xnOvYzBGU4Sea9CDcSq+AFJKiGnnl75 ncim+M1riN6HL+UH7VaNQLLSblbuEMgSxOzJQWzjjyyFbfFqgvSgR4zpQEYwcFKK RFVSzgiX7kv4IZPdBNqzHicARkZJOwq0ErGmDzK8LpBhwrNooPc8z5/bhWJFYj3h gN0720EAgoU3a4CfxBY7mnmjsqYisw== =N7H/ -----END PGP SIGNATURE----- --Apple-Mail=_911E660B-4686-421D-A407-A3304F020FAF-- From fusa-sig-bounces@lists.xenproject.org Wed Jun 15 16:04:51 2022 Return-path: Envelope-to: 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=?utf-8?B?Um4zb2hhYkdtY0lkQngwZnVZSkVSMVF4alFTOUlJK1lzVFIwNU9PbVhaRnI3?= =?utf-8?B?NUVyaXMvbU1jdnQ5M28rdnU3RitzTUE5NTUvVlcwa2VvakdtN3BIbXBIZEwz?= =?utf-8?B?Mzk0RExVVzJra2JvNktyUEVvaXBjdUE1TU5mY1VjWkJwR2ZVL2d3MlJCM3hG?= =?utf-8?B?Qzg1MlZUdTVIRXJQU0Z4Tkg4b1hOUWMzbFBGSGpTY0JjeVpwMko3eHNEdC9P?= =?utf-8?B?WmZVZld2VWVDSjVHZXVkM3Qydmx3ZTFhaG04WERqVmdrRmFmWE42K0hmZDg1?= =?utf-8?B?K2I1YkI0VEQ4YjZRdVk1RlNHZyt5WlovRVRTOGJFOFQ2aWtJQjF1L05NR2VC?= =?utf-8?B?WW0vZUNUV1BpRW1ZVE0zSlk5ems1dThIdFozYUU5NER2bE02UktIZz09?= X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-Network-Message-Id: f7897531-e621-4217-dbfb-08da4e9f614a X-MS-Exchange-CrossTenant-AuthSource: DS7PR03MB5608.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2022 07:19:26.6971 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: XFt3+z87aWKP3yyB6SrJQ/RRBNQoXnuQ0jrXTKpLLTjOdxBzIlmRBqzh1jCYnEsj3LJlPC9pt//IUOHeqwz1VQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR03MB6683 On Tue, Jun 14, 2022 at 03:47:12PM -0700, Stefano Stabellini wrote: > Hi all, > > Roberto was suggesting to use the following different categories for > tagging deviations. We could pick any "TAG" we like for the in-code > comments (or other tagging systems). > > I am also CCing the MISRA C team to give them early visibility on this. > Feel free to provide early feedback if you have any. The plan is to > discuss it further during the next fusa-sig call and come up with a more > detailed proposal (including the actual tags, how to use them and more) > for xen-devel next. > > Cheers, > > Stefano > > > > adopted > > The report should be considered originated by adopted code without any > contribution of native code to the report. > > safe > > The report is correct but the specific behavior is safe under every > aspect assumed to be covered by the guideline. > > relied > > The report is correct but the rule concerns exclusively "developer > confusion" or readability matters that are not relevant for adopted code, > which is assumed to work as is and it is not meant to be read, reviewed > or modified by human programmers. To be used for adopted code only. > > false-positive > > In the opinion of the developer the violation report is not correct > and the problem has been notified to the tool provider. > To be used only for violation reports. Do we want to tag false positives? There's no benefit at all from our code base tagging false positives, I think those should get fixed in the checker tool, or otherwise marked as false positives somewhere else (ie: in the tool itself). > > compliant > > The developer can prove that the possible non-compliance shown by > caution report cannot happen in any situation and can motivate such > claim. To be used only for caution reports. > > false-negative > > The developer has found a non-compliance not shown by the tool and the > problem has been notified to the tool provider. I'm also not sure tagging false-negatives is helpful either, specially if we want to consider this tag system is not bound to any specific tool. What could be a false negative to a specific checker tool might not be to another, and hence the tag would cause confusion. False negatives should be tagged like any other violation, ignoring the fact a specific checker tool hasn't been able to spot it. Overall I think this would need some clarification of the terms used, for example what's 'adapted code'. Also I think the usage of 'report' in the descriptions is confusing. AFAICT this is supposed to mean tags are added in reaction to reports by checker tools, but what about deviations that are find by humans, there's no 'report' in that case likely to refer to. The language seem to be focused against a tags being a reaction to a report from checker tools. Thanks, Roger. From fusa-sig-bounces@lists.xenproject.org Thu Jun 16 00:25:48 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 16 Jun 2022 00:25:48 +0000 Received: from list by lists.xenproject.org with outflank-mailman.350361.576673 (Exim 4.92) (envelope-from ) id 1o1dKW-00062B-3v; Thu, 16 Jun 2022 00:25:48 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 350361.576673; Thu, 16 Jun 2022 00:25:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1dKW-000628-0y; Thu, 16 Jun 2022 00:25:48 +0000 Received: by outflank-mailman (input) for mailman id 350361; Thu, 16 Jun 2022 00:22:27 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1dHH-0005z9-NY for fusa-sig@lists.xenproject.org; Thu, 16 Jun 2022 00:22:27 +0000 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 65972fce-ed0a-11ec-bd2c-47488cf2e6aa; Thu, 16 Jun 2022 02:22:26 +0200 (CEST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 9D69061A60; Thu, 16 Jun 2022 00:22:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86F07C3411A; Thu, 16 Jun 2022 00:22:23 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 65972fce-ed0a-11ec-bd2c-47488cf2e6aa DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655338944; bh=M4sE5lrmeqqZzIVbsxNdqLGYSK+k0ZSAp+z44JWL78s=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=nE0gAo9HWRsGt9tVB4qsEe6BCiERgSGXcu4LWxmcKLHu2zEZQNEq42EYWS1vA/x46 eMKzoy54KCSdJamnfAV6/gRuTUc8nqX/00FI+RigaYKxXW3uddagelHuK4QCsXQwVj 3IYhffRTxR/adZCs+lFnG/omOietaT/KuB9nzPl9o+DsyQhYM2aU4DcfJGVdZPkSeh 0tZyrFCSx3ra+PI6D/vj/uz0Gb7y1eA1Z3O/Dr+KbaSKnw4NxKM36byAEd7rRDaplp 4rpeMXwl/t/NuosTqitwo9ilsIiP2yAp8/V3cGn4npkYLQvzVY9cpNCibnv0ZwhU8N ZMuW6BCLj4Tjg== Date: Wed, 15 Jun 2022 17:22:23 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: George Dunlap cc: Stefano Stabellini , "fusa-sig@lists.xenproject.org" , "stefanos@xilinx.com" , Roberto Bagnara , Jan Beulich , Andrew Cooper , Roger Pau Monne , Julien Grall , Bertrand Marquis , Artem Mygaiev Subject: Re: deviations tagging In-Reply-To: <3F16727C-9067-471A-B9D3-4AFDB3E1A9D3@citrix.com> Message-ID: References: <3F16727C-9067-471A-B9D3-4AFDB3E1A9D3@citrix.com> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="8323329-2008354233-1655338944=:2430546" This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323329-2008354233-1655338944=:2430546 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT On Wed, 15 Jun 2022, George Dunlap wrote: > > On 14 Jun 2022, at 23:47, Stefano Stabellini wrote: > > > > Hi all, > > > > Roberto was suggesting to use the following different categories for > > tagging deviations. We could pick any "TAG" we like for the in-code > > comments (or other tagging systems). > > > > I am also CCing the MISRA C team to give them early visibility on this. > > Feel free to provide early feedback if you have any. The plan is to > > discuss it further during the next fusa-sig call and come up with a more > > detailed proposal (including the actual tags, how to use them and more) > > for xen-devel next. > > > > Cheers, > > > > Stefano > > > > > > > > adopted > > > > The report should be considered originated by adopted code without any > > contribution of native code to the report. > > What do “adopted code” and “native code” mean in this context? I think "adopted code" for us would be something like Linux code. "Native code" is code that we wrote. --8323329-2008354233-1655338944=:2430546-- From fusa-sig-bounces@lists.xenproject.org Thu Jun 16 00:25:48 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 16 Jun 2022 00:25:48 +0000 Received: from list by lists.xenproject.org with outflank-mailman.350363.576676 (Exim 4.92) (envelope-from ) id 1o1dKW-00062P-5i; Thu, 16 Jun 2022 00:25:48 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 350363.576676; Thu, 16 Jun 2022 00:25:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1dKW-00062F-1w; Thu, 16 Jun 2022 00:25:48 +0000 Received: by outflank-mailman (input) for mailman id 350363; Thu, 16 Jun 2022 00:24:59 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1dJj-00061c-Rr for fusa-sig@lists.xenproject.org; Thu, 16 Jun 2022 00:24:59 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [2604:1380:4601:e00::1]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id c031e01c-ed0a-11ec-ab14-113154c10af9; Thu, 16 Jun 2022 02:24:58 +0200 (CEST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 70CE0B8221A; Thu, 16 Jun 2022 00:24:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 916CEC3411A; Thu, 16 Jun 2022 00:24:54 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: c031e01c-ed0a-11ec-ab14-113154c10af9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655339095; bh=l5oG1HCunwHwfbgyaDldX7+VSL8zYvAPRe0gZqjhZcE=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=Sb4EBcU2WHenERiAOxElEhitwVAr+WT2n1QWmSTxzucBIw6VaCG2L9+7oQqSzCudV 3EAPj01kM5wXJYgU/O42x7s58aub9MevYxh7xP1hspaXAITEktmcxazjcCwO4czWrz 57BsU0zNHyKyjalaj0bbMjeSJYzcw44959azxpvLtoPgf9F8ECFkD13PDvoqatg5uV abX74MtnABUy/b9GYuZrCOYcs/H8LdE+KfPTG3BYHwSQN/fvsmReoT3CdpgrTnP5oB PDeRnq2WISNCKk5jgvqD2tld/fRibY4ag86AjjQSTfixXc33HeJ3SW8c1Gqlf/Oi4T lvhHhR0+dz7lQ== Date: Wed, 15 Jun 2022 17:24:54 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Jan Beulich cc: Luca Fancellu , Stefano Stabellini , Stefano Stabellini , "roberto.bagnara@bugseng.com" , Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Julien Grall , Bertrand Marquis , "Artem_Mygaiev@epam.com" , "fusa-sig@lists.xenproject.org" Subject: Re: deviations tagging In-Reply-To: <7d39d79c-3c1c-eeaf-e6c4-3c166748c5d7@suse.com> Message-ID: References: <662D876D-B1EB-4BDA-BCA6-6CF630B08182@arm.com> <7d39d79c-3c1c-eeaf-e6c4-3c166748c5d7@suse.com> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Wed, 15 Jun 2022, Jan Beulich wrote: > On 15.06.2022 10:37, Luca Fancellu wrote: > > As first thought I was thinking to propose the above tags with an incremental number > > that could work as a link to a file containing the justification for each finding. > > > > /* Safe- */ > > > > So that a preprocessor script can be used later to substitute the tag with the appropriate > > in-code comment suppression tag for a specified checker tool. > > While (assuming the file holding the justifications is meant to live in > xen.git) conflicts on that file would guarantee uniqueness of the number, > such conflicts would likely be frequent and require manual resolution > every single time. Such conflicts could appear as late as when a patch is > being committed, making the committers' (supposedly entirely mechanical) > job harder (besides perhaps requiring quite a bit more re-basing effort > by the submitter). To help with that, we could maybe have 1 file per justification (matching by filename), rather than 1 global file. E.g.: /* safe-1122 */ docs/misra/justifications/safe-1122.md From fusa-sig-bounces@lists.xenproject.org Thu Jun 16 12:05:31 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 16 Jun 2022 12:05:31 +0000 Received: from list by lists.xenproject.org with outflank-mailman.350584.576982 (Exim 4.92) (envelope-from ) id 1o1oFe-000423-JR; Thu, 16 Jun 2022 12:05:30 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 350584.576982; Thu, 16 Jun 2022 12:05:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1oFe-000420-GI; Thu, 16 Jun 2022 12:05:30 +0000 Received: by outflank-mailman (input) for mailman id 350584; Thu, 16 Jun 2022 12:05:29 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1oFd-00041u-6K for fusa-sig@lists.xenproject.org; Thu, 16 Jun 2022 12:05:29 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 9c199f89-ed6c-11ec-bd2c-47488cf2e6aa; Thu, 16 Jun 2022 14:05:27 +0200 (CEST) Received: from [192.168.1.219] (unknown [151.29.57.114]) by support.bugseng.com (Postfix) with ESMTPSA id 3444B4EE077F; Thu, 16 Jun 2022 14:05:26 +0200 (CEST) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 9c199f89-ed6c-11ec-bd2c-47488cf2e6aa Message-ID: Date: Thu, 16 Jun 2022 14:05:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050929 Thunderbird/1.0.7 Fedora/1.0.7-1.1.fc4 Mnenhy/0.7.3.0 Subject: Re: deviations tagging Content-Language: en-US To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Stefano Stabellini Cc: fusa-sig@lists.xenproject.org, stefanos@xilinx.com, jbeulich@suse.com, andrew.cooper3@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, Artem_Mygaiev@epam.com References: From: Roberto Bagnara In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 6/15/22 09:19, Roger Pau Monné wrote: > On Tue, Jun 14, 2022 at 03:47:12PM -0700, Stefano Stabellini wrote: >> Hi all, >> >> Roberto was suggesting to use the following different categories for >> tagging deviations. We could pick any "TAG" we like for the in-code >> comments (or other tagging systems). >> >> I am also CCing the MISRA C team to give them early visibility on this. >> Feel free to provide early feedback if you have any. The plan is to >> discuss it further during the next fusa-sig call and come up with a more >> detailed proposal (including the actual tags, how to use them and more) >> for xen-devel next. >> >> Cheers, >> >> Stefano >> >> >> >> adopted >> >> The report should be considered originated by adopted code without any >> contribution of native code to the report. >> >> safe >> >> The report is correct but the specific behavior is safe under every >> aspect assumed to be covered by the guideline. >> >> relied >> >> The report is correct but the rule concerns exclusively "developer >> confusion" or readability matters that are not relevant for adopted code, >> which is assumed to work as is and it is not meant to be read, reviewed >> or modified by human programmers. To be used for adopted code only. >> >> false-positive >> >> In the opinion of the developer the violation report is not correct >> and the problem has been notified to the tool provider. >> To be used only for violation reports. > > Do we want to tag false positives? There's no benefit at all from our > code base tagging false positives, I think those should get fixed in > the checker tool, or otherwise marked as false positives somewhere > else (ie: in the tool itself). A false positive is a "definite violation" report issued by a tool which turns out not to be real. (Note that a "possible violation" report, sometimes called a "caution" or an "orange", cannot be a false positive because it is not a positive: not all tools make this distinction.) False positives will be reported, by all tools. It is not a simple matter of the tool being sound or defective: the MISRA coding standards are human artifacts with ambiguities and defects. Issues of the form "is this a violation?" can be in the agenda of the MISRA working groups for years before a final decision is made. During this period, some tools will implement one interpretation and other tools will implement a different interpretation. (If this surprises you, there are known defects of the C standard that, after 20+ years, still nobody is sure how to solve.) So, a false positive might sit there for ages, and the benefit for your code base in tagging it is that you need not reanalyze it over and over again. >> compliant >> >> The developer can prove that the possible non-compliance shown by >> caution report cannot happen in any situation and can motivate such >> claim. To be used only for caution reports. >> >> false-negative >> >> The developer has found a non-compliance not shown by the tool and the >> problem has been notified to the tool provider. > > I'm also not sure tagging false-negatives is helpful either, specially > if we want to consider this tag system is not bound to any specific > tool. What could be a false negative to a specific checker tool might > not be to another, and hence the tag would cause confusion. False > negatives should be tagged like any other violation, ignoring the fact > a specific checker tool hasn't been able to spot it. > Also I think the usage of 'report' in the descriptions is confusing. > AFAICT this is supposed to mean tags are added in reaction to reports > by checker tools, but what about deviations that are find by humans, > there's no 'report' in that case likely to refer to. The language > seem to be focused against a tags being a reaction to a report from > checker tools. I am not sure what you mean by "deviation that are found by humans". I guess you mean "violations that are found by humans." This is indeed rare, because humans are not very good at spotting MISRA violations, but once they do, tagging the occurrence is helpful during the period in which you and the tool vendor (and maybe the MISRA C working group if there is no consensus on whether there is a violation there or not) decide what to do about it. Kind regards, Roberto From fusa-sig-bounces@lists.xenproject.org Thu Jun 16 16:21:43 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 16 Jun 2022 16:21:43 +0000 Received: from list by lists.xenproject.org with outflank-mailman.350425.577207 (Exim 4.92) (envelope-from ) id 1o1sFa-0008SH-S5; Thu, 16 Jun 2022 16:21:42 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 350425.577207; Thu, 16 Jun 2022 16:21:42 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1sFa-0008SD-PJ; Thu, 16 Jun 2022 16:21:42 +0000 Received: by outflank-mailman (input) for mailman id 350425; Thu, 16 Jun 2022 06:14:00 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1ilU-0006IV-5i for fusa-sig@lists.xenproject.org; Thu, 16 Jun 2022 06:14:00 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 820adfcc-ed3b-11ec-ab14-113154c10af9; Thu, 16 Jun 2022 08:13:58 +0200 (CEST) Received: from [192.168.1.219] (unknown [151.29.57.114]) by support.bugseng.com (Postfix) with ESMTPSA id 2ACAE4EE077F; Thu, 16 Jun 2022 08:13:57 +0200 (CEST) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 820adfcc-ed3b-11ec-ab14-113154c10af9 Message-ID: <89e999ae-1b32-1759-ccd2-905b7e500da0@bugseng.com> Date: Thu, 16 Jun 2022 08:13:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050929 Thunderbird/1.0.7 Fedora/1.0.7-1.1.fc4 Mnenhy/0.7.3.0 Subject: MISRA Adopted Code [Was: Re: deviations tagging] Content-Language: en-US To: George Dunlap , Stefano Stabellini Cc: "fusa-sig@lists.xenproject.org" , "stefanos@xilinx.com" , Jan Beulich , Andrew Cooper , Roger Pau Monne , Julien Grall , Bertrand Marquis , Artem Mygaiev References: <3F16727C-9067-471A-B9D3-4AFDB3E1A9D3@citrix.com> From: Roberto Bagnara In-Reply-To: <3F16727C-9067-471A-B9D3-4AFDB3E1A9D3@citrix.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit The notion of "Adopted Code" is defined on Section 6 of https://www.misra.org.uk/app/uploads/2021/06/MISRA-Compliance-2020.pdf It is just 3 pages and is a very recommended reading. I also suggest reading Section 4 on "Deviations" (another 3 pages). Kind regards, Roberto On 6/15/22 11:43, George Dunlap wrote: > > >> On 14 Jun 2022, at 23:47, Stefano Stabellini wrote: >> >> Hi all, >> >> Roberto was suggesting to use the following different categories for >> tagging deviations. We could pick any "TAG" we like for the in-code >> comments (or other tagging systems). >> >> I am also CCing the MISRA C team to give them early visibility on this. >> Feel free to provide early feedback if you have any. The plan is to >> discuss it further during the next fusa-sig call and come up with a more >> detailed proposal (including the actual tags, how to use them and more) >> for xen-devel next. >> >> Cheers, >> >> Stefano >> >> >> >> adopted >> >> The report should be considered originated by adopted code without any >> contribution of native code to the report. > > What do “adopted code” and “native code” mean in this context? > > -George > From fusa-sig-bounces@lists.xenproject.org Thu Jun 16 21:29:49 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Thu, 16 Jun 2022 21:29:49 +0000 Received: from list by lists.xenproject.org with outflank-mailman.350901.577330 (Exim 4.92) (envelope-from ) id 1o1x3k-0006A5-W1; Thu, 16 Jun 2022 21:29:48 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 350901.577330; Thu, 16 Jun 2022 21:29:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1x3k-00069x-Rl; Thu, 16 Jun 2022 21:29:48 +0000 Received: by outflank-mailman (input) for mailman id 350901; Thu, 16 Jun 2022 21:27:34 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o1x1a-0005uO-Sb for fusa-sig@lists.xenproject.org; Thu, 16 Jun 2022 21:27:34 +0000 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 214264b8-edbb-11ec-ab14-113154c10af9; Thu, 16 Jun 2022 23:27:33 +0200 (CEST) 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 919A5CE276E; Thu, 16 Jun 2022 21:27:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70B94C34114; Thu, 16 Jun 2022 21:27:28 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: 214264b8-edbb-11ec-ab14-113154c10af9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655414848; bh=BjkMbCoXyvN7yHqZA5J5VbfaGx/qZSTM7hEDhV5wvVE=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=DmNuEFNSkf1YyTQihEZA1BTRRjGFcORJTIoY1lqzPc2NTC5B9V2JRcOfy3ifFqw1J vvzyaIuq6uWdX7Ja1ShjNPUimDNoMrugvXn36RnzMsa72b49arRPWdnYutH/EaQYM2 4fPwTZ+BrF5ZLlHAOGwEe4PHoe0r/+lOwvelwiHyH/j3Y0UQPdkO9MCehMFxeq6eRR uuh4HQUehsS1B9MKxgsQDo5QA1mjLy3e38a50M5nbfSW57gZmEmK45xTMIekz135ed FXy2AQ4DIZKJG5T5X24v+7tle8hb7WhbKGxGYGou2DvyqvRtls0Vp6D2lwHIGdwxHL pjZMqDFG3iYCQ== Date: Thu, 16 Jun 2022 14:27:28 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Stefano Stabellini cc: fusa-sig@lists.xenproject.org, stefanos@xilinx.com, roberto.bagnara@bugseng.com, jbeulich@suse.com, andrew.cooper3@citrix.com, roger.pau@citrix.com, julien@xen.org, Bertrand.Marquis@arm.com, Artem_Mygaiev@epam.com Subject: Re: deviations tagging In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Just a quick note on this topic: Roberto kindly agreed to join the next FuSa SIG call on Jun 27 at 9AM California time / 5PM UK / 6PM Europe to discuss deviation tagging. Everyone interested is welcome to join. The meeting link is the following: https://xilinx.zoom.us/j/95938426236?from=addon Cheers, Stefano On Tue, 14 Jun 2022, Stefano Stabellini wrote: > Hi all, > > Roberto was suggesting to use the following different categories for > tagging deviations. We could pick any "TAG" we like for the in-code > comments (or other tagging systems). > > I am also CCing the MISRA C team to give them early visibility on this. > Feel free to provide early feedback if you have any. The plan is to > discuss it further during the next fusa-sig call and come up with a more > detailed proposal (including the actual tags, how to use them and more) > for xen-devel next. > > Cheers, > > Stefano > > > > adopted > > The report should be considered originated by adopted code without any > contribution of native code to the report. > > safe > > The report is correct but the specific behavior is safe under every > aspect assumed to be covered by the guideline. > > relied > > The report is correct but the rule concerns exclusively "developer > confusion" or readability matters that are not relevant for adopted code, > which is assumed to work as is and it is not meant to be read, reviewed > or modified by human programmers. To be used for adopted code only. > > false-positive > > In the opinion of the developer the violation report is not correct > and the problem has been notified to the tool provider. > To be used only for violation reports. > > compliant > > The developer can prove that the possible non-compliance shown by > caution report cannot happen in any situation and can motivate such > claim. To be used only for caution reports. > > false-negative > > The developer has found a non-compliance not shown by the tool and the > problem has been notified to the tool provider. > > From fusa-sig-bounces@lists.xenproject.org Fri Jun 17 15:01:57 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Fri, 17 Jun 2022 15:01:57 +0000 Received: from list by lists.xenproject.org with outflank-mailman.351063.578129 (Exim 4.92) (envelope-from ) id 1o2DTx-0001cA-I0; Fri, 17 Jun 2022 15:01:57 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 351063.578129; Fri, 17 Jun 2022 15:01:57 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o2DTx-0001c6-F6; Fri, 17 Jun 2022 15:01:57 +0000 Received: by outflank-mailman (input) for mailman id 351063; Fri, 17 Jun 2022 07:18:27 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o26FO-0004wE-OC for fusa-sig@lists.xenproject.org; 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We could pick any "TAG" we like for the in-code > > > comments (or other tagging systems). > > > > > > I am also CCing the MISRA C team to give them early visibility on this. > > > Feel free to provide early feedback if you have any. The plan is to > > > discuss it further during the next fusa-sig call and come up with a more > > > detailed proposal (including the actual tags, how to use them and more) > > > for xen-devel next. > > > > > > Cheers, > > > > > > Stefano > > > > > > > > > > > > adopted > > > > > > The report should be considered originated by adopted code without any > > > contribution of native code to the report. > > > > > > safe > > > > > > The report is correct but the specific behavior is safe under every > > > aspect assumed to be covered by the guideline. > > > > > > relied > > > > > > The report is correct but the rule concerns exclusively "developer > > > confusion" or readability matters that are not relevant for adopted code, > > > which is assumed to work as is and it is not meant to be read, reviewed > > > or modified by human programmers. To be used for adopted code only. > > > > > > false-positive > > > > > > In the opinion of the developer the violation report is not correct > > > and the problem has been notified to the tool provider. > > > To be used only for violation reports. > > > > Do we want to tag false positives? There's no benefit at all from our > > code base tagging false positives, I think those should get fixed in > > the checker tool, or otherwise marked as false positives somewhere > > else (ie: in the tool itself). > > A false positive is a "definite violation" report issued by a tool which > turns out not to be real. (Note that a "possible violation" report, > sometimes called a "caution" or an "orange", cannot be a false positive > because it is not a positive: not all tools make this distinction.) > > False positives will be reported, by all tools. It is not a simple matter > of the tool being sound or defective: the MISRA coding standards are human > artifacts with ambiguities and defects. Issues of the form "is this a violation?" > can be in the agenda of the MISRA working groups for years before a final > decision is made. During this period, some tools will implement one > interpretation and other tools will implement a different interpretation. > (If this surprises you, there are known defects of the C standard that, > after 20+ years, still nobody is sure how to solve.) > > So, a false positive might sit there for ages, and the benefit for your > code base in tagging it is that you need not reanalyze it over and > over again. Right, we already carry bodges for compilers, so carrying those for checkers seems inevitable if we plan to use them. I guess it also depends on how obvious a false-positive is from a human PoV, and how many of them do we need to tag. I would really like to avoid having files plagued with tags to placate false-positives from the possibly different set of checker tools that we support, specially if those false-positives are trivial to triage for a human. > > > compliant > > > > > > The developer can prove that the possible non-compliance shown by > > > caution report cannot happen in any situation and can motivate such > > > claim. To be used only for caution reports. > > > > > > false-negative > > > > > > The developer has found a non-compliance not shown by the tool and the > > > problem has been notified to the tool provider. > > > > I'm also not sure tagging false-negatives is helpful either, specially > > if we want to consider this tag system is not bound to any specific > > tool. What could be a false negative to a specific checker tool might > > not be to another, and hence the tag would cause confusion. False > > negatives should be tagged like any other violation, ignoring the fact > > a specific checker tool hasn't been able to spot it. > > > Also I think the usage of 'report' in the descriptions is confusing. > > AFAICT this is supposed to mean tags are added in reaction to reports > > by checker tools, but what about deviations that are find by humans, > > there's no 'report' in that case likely to refer to. The language > > seem to be focused against a tags being a reaction to a report from > > checker tools. > > I am not sure what you mean by "deviation that are found by humans". > I guess you mean "violations that are found by humans." > This is indeed rare, because humans are not very good at spotting > MISRA violations, but once they do, tagging the occurrence is helpful > during the period in which you and the tool vendor (and maybe the > MISRA C working group if there is no consensus on whether there > is a violation there or not) decide what to do about it. My main concern is why non-compliances not found by a checker tool needs to be tagged in a specific way (ie: false-negative), IMO they should just be tagged using the same tags as if the non-compliance was found by a checker tool. Anyone interested in false-negatives from a specific checker tool should be able to obtain them by cross-checking the tags in the code with the report from the checker tool, and any tags in the source not matching a checker report would be a false-negative. Thanks, Roger. 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Such conflicts could appear as late as when a patch is >> being committed, making the committers' (supposedly entirely mechanical) >> job harder (besides perhaps requiring quite a bit more re-basing effort >> by the submitter). > > To help with that, we could maybe have 1 file per justification > (matching by filename), rather than 1 global file. E.g.: > > /* safe-1122 */ > > docs/misra/justifications/safe-1122.md I don't see how this would eliminate conflicts: In a single file the conflict would (typically) be two patches wanting to add the same number (with different text). With your new proposal the conflict would be two parties wanting to add the same new file with different content. I'm also afraid file-system-wise this wouldn't scale very well. A single directory with thousands of files isn't very manageable. Plus with the use of numbers name completion also won't be of much help. Jan From fusa-sig-bounces@lists.xenproject.org Mon Jun 27 19:23:38 2022 Return-path: Envelope-to: archives@lists.xenproject.org Delivery-date: Mon, 27 Jun 2022 19:23:38 +0000 Received: from list by lists.xenproject.org with outflank-mailman.356928.585287 (Exim 4.92) (envelope-from ) id 1o5uKg-0007FL-EX; Mon, 27 Jun 2022 19:23:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 356928.585287; Mon, 27 Jun 2022 19:23:38 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o5uKg-0007FI-Ad; Mon, 27 Jun 2022 19:23:38 +0000 Received: by outflank-mailman (input) for mailman id 356928; Mon, 27 Jun 2022 19:23:37 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o5uKf-0007FC-1M for fusa-sig@lists.xenproject.org; Mon, 27 Jun 2022 19:23:37 +0000 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id a354b3fe-f64e-11ec-b725-ed86ccbb4733; Mon, 27 Jun 2022 21:23:35 +0200 (CEST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 852D5B818B5 for ; Mon, 27 Jun 2022 19:23:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17912C3411D; Mon, 27 Jun 2022 19:23:33 +0000 (UTC) X-BeenThere: fusa-sig@lists.xenproject.org List-Id: This is a discussion list for members of the Xen Project FuSa SIG List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: fusa-sig-bounces@lists.xenproject.org Precedence: list Sender: "Fusa-sig" X-Inumbo-ID: a354b3fe-f64e-11ec-b725-ed86ccbb4733 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656357813; bh=DGvHP6emeYi6Ai7aiq7+ndyxFClDy70QegbDMvIN+Tw=; h=Date:From:To:cc:Subject:From; b=YE34561YrAx4p5p4Btt6qm558PdCcFSsjU7QtfG5cQ5I+gSMTYyujfbW7VWyIdF+v mLbT1y/q9x4j2NVXmeTZg2UCgAwstY7lTHpNw/iIt1KEyhKhCnN1KJIy58i1eyTNwx hM3scF30BnVa6VqL8xa36V/ILvNg7bcMRcCxF9Zx7Jn+VoCEjEKmjW1rK2yqqJ/yLi ais0KjbBOJywt+Gf/hJVJvSLddLs4LoammTbCSC8fQ3+Wr/WJZBbKoVqxFXpjsaTcF arEg063F0Sgux7EGfR9pIeodgQIAVE1uX3520vjf0O4D4Gu7nKTXszo+zQm2Qbhadu 3qRTBqo+CWQrQ== Date: Mon, 27 Jun 2022 12:23:32 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: fusa-sig@lists.xenproject.org cc: sstabellini@kernel.org Subject: Notes from FuSa meeting 2022-06-22 about Deviations Message-ID: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Hi all, These are some of the notes that I took today during the meeting about deviations Cheers, Stefano --- reasons for deviations: - code quality - access to hardware (need compiler extensions to access hardware) - adopted code integration - non-compliant adopted code Purpose of tagging: - I don't want to see this report from the tools again - This is the reason why I am deviating Tags: - adopted this is adopted code - safe it is a violation but actually the code is safe - relied this is for adopted code again and only concern dev confusion - false-positive - compliant for *possible* violations which are safe - false-negative Flagging a violation that is present in the code even if the tool doesn't spot it. Probably not applicable to Xen as we want to enable multiple tools Probably none of our code can be claimed to be "adopted" according to MISRA, even the one coming from Linux. There is a way to silence warnings at the file level. We can silence warnings at a file level for code coming from Linux for now, until we figure out a strategy. 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Probably not applicable to Xen as we want to enable > multiple tools > > > Probably none of our code can be claimed to be "adopted" according to > MISRA, even the one coming from Linux. So that would limit the tags that we use to: safe, compliant and false-positive? I'm not sure the difference between safe and compliant is worth having a different tag: both will need a written justification anyway. Maybe would be clearer if there was some example of the different usage of safe vs compliant. Thanks, Roger. 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Probably not applicable to Xen as we want to enable > >> multiple tools > >> > >> > >> Probably none of our code can be claimed to be "adopted" according to > >> MISRA, even the one coming from Linux. > > > > So that would limit the tags that we use to: safe, compliant and > > false-positive? > > Hi Roger, > > I’m afraid we don’t have an answer yet, the meeting run out of time > yesterday because there was a lot to talk about each tag, probably > In the following meetings we will have the chance to talk about it. > > > > > I'm not sure the difference between safe and compliant is worth having > > a different tag: both will need a written justification anyway. Maybe > > would be clearer if there was some example of the different usage of > > safe vs compliant. > > my understanding from Roberto Bagnara’s explanation is that Compliant is > a tag marking a *possible* violation emitted by the tool, so the tool tells you > that there might be a violation because there are probably variables above its > control (for example it doesn’t have a full path graph because a function is called > by interrupt vectors, architectural behaviours, …) so the tool’s job is to warn you > about that and our job is to have a look on that piece of code and prove that it > works under all the conditions the code is meant to work. OK, so a 'compliant' is a possible violation, at which point a human should go and analyze whether it's a real violation (and thus requires a 'safe' tag) or it's a tool 'false-positive'. I'm not sure I see the need for such tag, but I might be missing the point. It seems to be a tag designed to cover for a checker deficiency (ie: unable to determine without uncertainty whether a code is a violation), but we already have false-positive for that. Thanks, Roger.