linux-kernel - Helping with backports: linux-next, linux, linux-stable

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Message-ID: <CAB=NE6UVZ2HQU27LdkzUFe3of6N1v8YZYVMKsfA+0Wmg5nRBug@mail.gmail.com>
Date:	Thu, 20 Sep 2012 15:45:46 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Konstantin Ryabitsev <mricon@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, backports@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Helping with backports: linux-next, linux, linux-stable - a few enhancements

Greg, Stephen, Konstantin,

so for the Linux backports project [0] we rely on a few git trees:

  * linux-next.git
  * linux-stable.git
  * linux.git

The linux.git tree is required for RC releases. The linux-stable.git
tree for extraversion stable releases, and the linux-next.git tree for
daily snapshots. There is a trick for stable releases whereby we
accelerate the integration of pending-stable patches by cherry picking
them out of linux-next.git if the commit log entry has the
'stable@...r.kernel.org' on the commit log, and if the stable patch
does not apply we require the developers to provide a backport
compatible port. This trick works swell on linux-next.git for RC
release given that we can query for rc releases there as linux-next
carries them but linux-next.git does not carry extra version tags.
Additionally the requirement of linux.git is only there given that at
times there are delays between which linux-stable.git will not have an
RC release on it. I have a way to address all these issues, namely to
add linux.git as a remote for my local linux-stable tree, and also by
adding linux-stable as a local remote for my linux-next tree. Now, I
document how I resolve this for backport package consumers / builders
but it occurs to me perhaps we can simplify this if we had:

  * linux-next - pulling in linux-stable packs / tags
  * a new linux-releases.git - which has both linux.git and
linux-stable pulled together through a cronjob

Would this be reasonable to accommodate to help ease of use or shall
we just live with folks having to do the remote / local remote hacks?

[0] https://backports.wiki.kernel.org/

  LUis
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