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[209.51.188.17]) by mx.google.com with ESMTPS id c4si1330144qkj.144.2020.02.06.01.57.05 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 06 Feb 2020 01:57:05 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=LSShHTuA; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:34692 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1izduB-0002GE-K1 for alex.bennee@linaro.org; Thu, 06 Feb 2020 04:57:04 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:50482) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1izdti-0002FN-Uc for qemu-arm@nongnu.org; Thu, 06 Feb 2020 04:56:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1izdth-0000a7-0V for qemu-arm@nongnu.org; Thu, 06 Feb 2020 04:56:34 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:20511 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1izdtf-0000Ul-F9 for qemu-arm@nongnu.org; Thu, 06 Feb 2020 04:56:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1580982991; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wvGcVVWN7dt2fAY8WfvoWDjRJxfK0DPrldxxpTv42Fw=; b=LSShHTuALpFpxj5tpo0Tzr6KaoWrI34pSldEkjmQMKdOMrRHcAry7T8Qc9FZxfLKD1rWjU tQZ0Hrymitn/lOM0/4qhRK114fIx3BZpECnp4Wjo9AdAfL7gheFWYJg9cP0Zhvr7/00wg5 nsdkLnQekfofbed2dU1VgOubUpbc/fw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-31-0lCrKGGMOF-zAlOsbHMA4Q-1; Thu, 06 Feb 2020 04:56:16 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 470A71413; Thu, 6 Feb 2020 09:56:15 +0000 (UTC) Received: from redhat.com (ovpn-112-65.ams2.redhat.com [10.36.112.65]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1F2AD10018FF; Thu, 6 Feb 2020 09:56:04 +0000 (UTC) Date: Thu, 6 Feb 2020 09:56:01 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Subject: Re: [PATCH for-5.0 3/4] Remove the core bluetooth code Message-ID: <20200206095601.GC2391707@redhat.com> References: <20191120091014.16883-1-thuth@redhat.com> <20191120091014.16883-4-thuth@redhat.com> <7a775153-f18d-e766-1d8f-33607f5fa05b@amsat.org> <2396dfd4-6c85-d17a-b358-bd058c757f14@redhat.com> <20200205175115.GT2221087@redhat.com> <3585192d-a0c1-4116-bec9-4816d498ca3d@amsat.org> MIME-Version: 1.0 In-Reply-To: <3585192d-a0c1-4116-bec9-4816d498ca3d@amsat.org> User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: 0lCrKGGMOF-zAlOsbHMA4Q-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Peter Maydell , Thomas Huth , libvir-list@redhat.com, "qemu-devel@nongnu.org Developers" , qemu-arm , Gerd Hoffmann , Paolo Bonzini , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Aleksandar Markovic Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: z+hVOgvCSH3o On Wed, Feb 05, 2020 at 08:13:19PM +0100, Philippe Mathieu-Daud=C3=A9 wrote= : > On 2/5/20 6:51 PM, Daniel P. Berrang=C3=A9 wrote: > > On Wed, Feb 05, 2020 at 06:40:31PM +0100, Aleksandar Markovic wrote: > >> On Sat, Feb 1, 2020 at 7:53 PM Philippe Mathieu-Daud=C3=A9 wrote: > >>> > >>>>>> @@ -1151,10 +1150,6 @@ for opt do > >>>>>> ;; > >>>>>> --enable-brlapi) brlapi=3D"yes" > >>>>>> ;; > >>>>>> - --disable-bluez) bluez=3D"no" > >>>>>> - ;; > >>>>>> - --enable-bluez) bluez=3D"yes" > >>>>>> - ;; > >>>>> > >>>>> Now than I'm bisecting over this commit, I realize removing this > >>>>> option was not a good idea, we should have done like commit > >>>>> cb6414dfec8 or 315d3184525: > >>>>> > >>>>> @@ -886,10 +885,6 @@ for opt do > >>>>> - --disable-uuid) uuid=3D"no" > >>>>> - ;; > >>>>> - --enable-uuid) uuid=3D"yes" > >>>>> - ;; > >>>>> ... > >>>>> + --enable-uuid|--disable-uuid) > >>>>> + echo "$0: $opt is obsolete, UUID support is always built" = >&2 > >>>>> + ;; > >>>> > >>>> Looks trivial ... so if it bugs you, just send a patch? > >>> > >>> I thought about it but this won't fix much, it is too late now. > >>> > >>> I simply wanted to share this bugged me so we try to avoid doing the > >>> same mistake again. > >>> > >> > >> I vote for addition of a change similar to what Philippe described. > >> > >> Furthermore, it looks to me the correct way would be to now do full > >> deprecation of --enable-bluez and --disable-bluez. This means adding > >> this to documentation (not related to bluetooth devices support), not > >> only a change in "configure". This also means that only after two next > >> full cycles these options could be removed. > >> > >> True, this could have been done together with bluetooth devices > >> support deprecation (and in that case we could have deleted these > >> options right away), but it wasn't. Users don't have a crystal ball to > >> know that we assumed that --enable-bluez and --disable-bluez were part > >> of bluetooth devices support, and could rightfully complain about an > >> abrupt elimination of a compile time option. > >=20 > > The deprecation policy is primarily intended for notifying of changes > > to QEMU's stable interfaces ( CLI, HMP, QMP) which affect behaviour > > and usage of QEMU at runtime & are liable to break apps managing > > QEMU. > >=20 > > Changes to build time options have no strong reason to be subjected to > > the deprecation process. If we remove an option at build time the effec= t > > is noticed immediately and the solution is straightforward (stop passin= g > > the option). We have added / removed configure options at will with lit= tle > > negative feedback historically. We'll have far biggest changes coming t= o > > the build system in future too, with the introduction of meson. >=20 > I understand your point when looking forward (when distribution upgrade, > it is easy to adapt). > However this is still an issue when looking backward when running > bisection to find regressions. That's only a problem if you were actively setting this particular command line argument. Most developers are just fine with configure auto-detecting stuff. The only time I've ever needed to try to explicitly disable this is in downstream RHEL branches of QEMU Regards, Daniel --=20 |: https://berrange.com -o- https://www.flickr.com/photos/dberrange= :| |: https://libvirt.org -o- https://fstop138.berrange.com= :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange= :|