linux-kernel - Re: [GIT PULL] KVM updates for the 3.4 merge window

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Date:	Mon, 26 Mar 2012 07:51:24 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Paul Mackerras <paulus@....ibm.com>,
	Alexander Graf <agraf@...e.de>
Subject: Re: [GIT PULL] KVM updates for the 3.4 merge window

On Sun, 2012-03-25 at 12:09 +0200, Avi Kivity wrote:

> Well I've been doing this ever since I moved to git.  The motivation was
> actually to make things easier for patch authors by allowing them to
> work against a tree of all applied patches, while the update for the
> next merge window is just a subset, with more fixes going into the merge
> window even late in the cycle, and features being deferred to the next
> one.  I also fold fixes or reverts into their parent patches to improve
> bisectability.
> 
> I can switch to fast-forward-only in the future, but I'm afraid that
> this particular tree is broken for good.  The un-rebased
> fast-forward-only source for this is kvm.git master, which I don't think
> you want to pull.  It will cause every kvm commit to appear twice and
> confuse everyone. 

The problem is that it makes it very hard if not impossible to work
with a combination of your tree & other trees (for example at some point
I had to work on a merge of alex'tree, powerpc-next and pci-next).

I don't see the problem with using the standard way and having
sub-maintainers/developers.... Most of my sub-maintainers work on top of
some upstream or they branch off my -next branch (which is known to
never be rebased, so it's resync'ed as soon as Linux pulls it). Dealing
with branches & merges in git is trivial and easier than dealing with
the clashes caused by the rebases :-)

One thing I do, is to also sometimes put out a powerpc-test branch that
people know can and will be rebased, it's purely there if I want some
folks to test a bunch of stuff but without basing their own work on top
of it.

And yes, there's a drawback vs. bisectability. You can still fold-in if
you pickup patches from the list (vs pulling from sub-maintainers) as
long as you haven't committed them to a "non-rebase" branch (ie, you can
let things stage in a test branch for example for a couple of weeks to
flush out those issues).

Cheers,
Ben.

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