Re: [RFC V2] Create supported branch from edk2-stable* tag (Required to address critical bug BZ3111)

Michael D Kinney

-----Original Message-----
From: gaoliming <gaoliming@...>
Sent: Tuesday, December 15, 2020 5:19 PM
To: Kinney, Michael D <michael.d.kinney@...>;;; 'Andrew Fish'
<afish@...>; 'Leif Lindholm' <leif@...>; lersek@...; 'Sean Brogan' <sean.brogan@...>;
'Bret Barkelew' <Bret.Barkelew@...>
Subject: 回复: [RFC V2] Create supported branch from edk2-stable* tag (Required to address critical bug BZ3111)


发件人: Kinney, Michael D <michael.d.kinney@...>
发送时间: 2020年12月16日 8:25
gaoliming@...; Andrew Fish (afish@...)
<afish@...>; Leif Lindholm <leif@...>; Laszlo Ersek
<lersek@...> (lersek@...) <lersek@...>; 'Sean
Brogan' <sean.brogan@...>; 'Bret Barkelew'
<Bret.Barkelew@...>; Kinney, Michael D
主题: [RFC V2] Create supported branch from edk2-stable* tag (Required to
address critical bug BZ3111)


The following bug has been fixed on edk2/master

This bug is also considered a critical bug against edk2-stable202011. The
of the Variable Lock Protocol was changed in a non-backwards compatible
manner in
edk2-stable202011 and this is impacting some downstream platforms. The
2 commits on edk2/master restore the original behavior of the Variable Lock
[Liming] This one is for unit test. It is not critical fix. I don't think it is required.

I agree it is not strictly required for functionality, but the bug fix that is required
was reviewed and submitted in a PR as a patch series. I think critical bug fixes should
be applied to a supported branch at the same granularity they were submitted to the
trunk. Since the EDK II CI system does not evaluate the stability of each patch in
a patch series, there is a risk to take portions of a patch series.

I suggest when a critical bug fix is identified, that we start with cherry-picking
all the patches in the patch series. If there is a specific concern about taking
the entire patch series, then that can be discussed and potentially a different
patch series can be applied to the supported branch. This would require CI on
supported branch to make sure the quality and functionality are the same.

The request here is to create a supported branch from edk2-stable202011 tag
and apply
these 2 commits as critical bug fixes on the supported branch.

Since we started using the edk2-stable* tag process, there has not been a
request to create
a supported branch from one of those tags. As a result, there are a couple
opens that
need to be addressed:

1) Supported branch naming convention.

Proposal: stable/<YYYY><MM>
Example: stable/202011
Here is my suggestion on the live period of the stable tag branch.
The stable tag branch will be created only when the critical issue is found in this stable tag. By default, no stable tag
branch is created.
Now, the quarterly stable tag will be created every three months. So, this branch will exist for at most three months.
Once next stable tag is created, new stable tag will be used. Previous stable tag branch will not be maintained.
That means only latest stable tag branch will be maintained if it is created.
It is hard to predict how downstream platforms use a stable tag or a supported branch.
If a downstream consumer identifies a critical bug in a previous stable tag or
a supported branch, then that bug report needs to be evaluated and determine if
the bug fix needs to be applied to a stable branch or not. I do not think we should
reject all requests just because there is a more recent stable tag. We need
to evaluate each request.

We do want to encourage all platforms under development to use the latest stable
tag. But once a platform is released as a product using a specific stable tag
they may prefer to continue to use that stable tag for long term maintenance
of that platform.

2) CI requirements for supported branches.

Proposal: Update .azurepipelines yml files to also trigger on stable/*
and update GitHub settings so stable/* branches are protected
The patch has been verified in master. CI test may not be necessary.
In the general case where more than one critical bug may be fixed in a
stable branch, CI will help make sure that the combination of fixes
work together. For this first case, I agree that CI may not be required.

3) Release requirements for supported branches.

Proposal: If there are a significant number of critical fixes applied to
a stable/edk2-stable* branch, then a request for a release can be made
would trigger focused testing of the supported branch and creation of a
release. If all testing passes, then a tag is created on the
branch and a release is created on GitHub that summarizes the set of
fixes and the testing performed.

Proposal: edk2-stable<YYYY><MM>.<XX>
Example : edk2-stable201111.01
It is OK to create new stable tag per the request. The platform can use stable branch.
Thank you. I will start work on a patch for review.

Besides, there are few new issues. I have cancelled the bug triage meeting.

Please let me know if you have any feedback or comments on this proposal.
The goal
is to close on this topic this week.

Thank you,


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