On Fri, 12 Nov 2010, Catalin Marinas wrote:
> Hi Nicolas,
>
> On Thu, 2010-11-11 at 17:38 +0000, Nicolas Pitre wrote:
> > On Thu, 11 Nov 2010, Lorenzo Pieralisi wrote:
> > > To sum it up, I am just asking you what are your plans for the linaro-next
> > > tree and the operating mode we should aim for.
> >
> > I'm still wondering about that myself at the moment. Obviously, the
> > linaro-next is _not_ a good base for development. This is not a stable
> > tree but rather a merge tree which is trashed and rebuilt from scratch
> > every so often. It is therefore only useful for testing purposes. I'm
> > therefore asking the question if it is actually useful, and if people
> > did use it in the past. If not then I could probably spend my time on
> > other tasks.
>
> I haven't used it but I thought it's good for checking the integration
> of various trees which are not yet ready for the official -next tree
> (e.g. the FDT hasn't yet been endorsed by Russell, so not for mainline
> or -next at this point).
It is endorsed by Linaro though, and I'm going to start merging the good
pieces of DT into the stable Linaro kernels, per the discussion that
happened at LDS.
> It could be used for a bit more than just checking the merge
> conflicts. We could try compiling/running it and fixing bugs (which
> are then integrated in the original tree that caused them).
Obviously, and that was my rational for creating it in the first place.
But after doing it for one cycle, I'm wondering if there are people to
actually perform that testing.
> > The alternative I'm contemplating, which came after the decision to
> > merge DT patches in the Linaro "stable" tree, is to continue merging
> > patches in that branch and not rebase it,
>
> This may create additional work for people that use git rebase (or stgit
> etc.) in their workflow. Not really an issue if the lifetime of such
> tree is a mainline release cycle (i.e. you don't merge v2.6.37 into your
> 2.6.36 stable branch but create a new 2.6.37 branch).
Absolutely! My intention is to move on to the next mainline release
soon after it is released.
> People could
> either freeze their stable tree to be merged into Linaro or use other
> methods of maintaining both a merge-friendly and a rebased branch with
> the same source ('stg publish' :)).
Sure, but I think that many Linaro members are not yet to that level of
sophistication in their workflow. So instead of each member having to
figure out a good base with the latest mainline stuff to port their
patches to, I'm doing it centrally for everyone with an hybrid kernel
(stable in the core code but up to date with the latest ARM bits).
Basing their work on that tree should make development more
"confortable" than chasing latest mainline, while making an eventual
rebase for upstream submission easier.
> My view (not necessarily ARM's, it's up to the advisory board to
> comment) is that we shouldn't encourage people to develop against the
> Linaro (stable) kernel but against mainline or some other upstream tree
> they depend on (e.g. Lorenzo developing against an FDT tree from Grant).
> I agree that in some situations it may be just easier to develop against
> the Linaro tree since people can avoid duplicating the integration
> effort that Linaro does.
Exactly my point.
> So (again, IMHO) people that really need to develop against the Linaro
> kernel (maybe because they require features already integrated in the
> Linaro kernel) could rebase their work onto linaro-next. This way you
> prevent people from sending you pull requests for branches they maintain
> on top of the Linaro tree because of the merging conflicts in
> linaro-next. They would have to take the effort and base the tree
> against mainline or other dependent upstream before you can merge them.
... eventually. But some organizations aren't there yet. In the mean
time I think that a smoother workflow transition can be accomplished
with this branching of "stable" integration branches on top of each
official mainline kernels. Rebasing from linux-linaro-2.6.36 to , say,
mainline-2.6.37-rc5 for an upstream submission should then be fairly
trivial.
Nicolas
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