From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=cl2ZoF55; spf=none, err=permanent DNS error (domain: merlin.srs.infradead.org, ip: 205.233.59.134, mailfrom: batv+c9f6be30e694fe0d8223+5783+infradead.org+dwmw2@merlin.srs.infradead.org) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by groups.io with SMTP; Mon, 24 Jun 2019 06:10:41 -0700 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=jAXYPh6UTP5CzOhuJA4VNsOS2YIapW89Ht2fbCGqA+k=; b=cl2ZoF55e34Rk/jK4AuajlTwq U7nHTmNlaDK65V9+ErKNfp2eyvJiD6ANtPZgujtmMvn5Gb1TGAP6CMFI87eEEIRygbDhEe0zz8pDr qagvk36fS+0NU2u0hZY1oF2muhdfJVeHsdyXF/2X+GR99UuYdi2DnMhXWTL7kqIh4zGCoxvP8qlnZ MnzboLMUkRVG7le3UVwmFKq37uK2nSaa93yMOHpPXw88tGfloTxlul55R/j+pXIAFuqyuaBakP2jo AKsmo8pdKLn/1WIWUI5fJSA05gZMVjWs+vW9L9bkdlsCo5KyeJ1Qyd+WG15vwCutJsaBg4Mn+fhxr Fe3eNyxUQ==; Received: from 54-240-197-228.amazon.com ([54.240.197.228] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hfOk0-0008IO-Lz; Mon, 24 Jun 2019 13:10:37 +0000 Message-ID: Subject: Re: [edk2-devel] [edk2] [PATCH] OvmfPkg: QemuVideoDxe: Int10h stub for Windows 2008 R2 SP1 (stdvga, QXL) From: "David Woodhouse" To: Laszlo Ersek , devel@edk2.groups.io, Mike Maslenkin Date: Mon, 24 Jun 2019 14:10:34 +0100 In-Reply-To: <920cf69f-8ec8-616a-4a07-9e93e88f81b6@redhat.com> References: <1399571116-26442-1-git-send-email-lersek@redhat.com> <5370CA20.1030504@redhat.com> <1399911663.21359.36.camel@mg-think.sw.ru> <5bb64abf34399bae00b678d0cd8b5df1ac81871b.camel@infradead.org> <475c5196ba3901dc30f80c567524c27be52d00e0.camel@infradead.org> <920cf69f-8ec8-616a-4a07-9e93e88f81b6@redhat.com> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html X-Groupsio-MsgNum: 42747 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-04P8Cm4BviQL8Ql39O9t" --=-04P8Cm4BviQL8Ql39O9t Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2019-06-20 at 16:41 +0200, Laszlo Ersek wrote: > We've never merged pull requests before, but I remember that you prefer > those (because you dislike an edk2 subsys maintainer rebasing your > branch from your original fork-off point). So I'm not asking for the > patch email because I insist on using "git-am". I'm asking for it > because we'd like to review every patch on the list, for now. Going back to this... I generally prefer *everyone* to use the git workflow as $DEITY intended it, not just for my own submissions. When a developer writes and =E2=80=94 perhaps more to the point =E2=80=94 t= ests a patch, they have done so against a specific version of the project. With the proper git workflow, their contribution is merged with the correct parent information. The version control system is doing its job correctly and recording what actually happened; not an approximation of it. With git-am being used to apply those contributions on a later version of the tree, there is a *theoretical* possibility that some other seemingly innocuous change elsewhere in the tree just happens to break the newly-submitted code. The thing is: over time, at scale, the chances of that theoretical, highly unlikely, incompatibility happening approach 1. Anyone who has experience maintaining out-of-tree patches for any project over time will have seen this. Your patchset suddenly doesn't work, although it applied cleanly to the source tree, and you have to go hunting for whatever strange locking or other environment issue, or API semantics, broke it since you last updated. If =E2=80=94 no, WHEN =E2=80=94 this kind of thing happens, you can end up = with code being merged which, according to the recorded history, never actually worked at all. There is no way to use tools like 'git bisect' to find the working point, and what went wrong. It simply *never* worked, because the true history has been thrown away and not stored in the version control system. The version control system had *one* job, and you haven't allowed it to do that. And yes, it's unlikely and infrequent. But it *does* happen, and that's why we should use the tools properly as a matter of habit. For my own patches of course I do a 'git pull --rebase' occasionally to ensure that it all still works when my patches are applied on top of the git master branch. But even with the best intentions, that isn't really good enough. Because all the exhaustive manual testing of various corner cases (adding multiple boot targets, checking that selecting each of them does the right thing, turning 64-bit BARs on and off and doing builds with various different configs) is not happening when I do that 'git pull --rebase' smoke test. So even with me doing some basic retesting, it's possible that something ends up getting committed that, for some esoteric corner case, apparently never worked even though it *did* actually work when I wrote the code. And when we realise that in a year's time and look back, the version control system won't help us because we didn't use it properly. --=-04P8Cm4BviQL8Ql39O9t Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ 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