Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>
>>Jan Kiszka wrote:
>>
>>>Jan Kiszka wrote:
>>>
>>>
>>>>...
>>>>[Keeping up-to-date]
>>>>1. The original kernel tree may have been updated, and the ipipe patch
>>>> needs to be rebased
>>>>
>>>> # git fetch
>>>> # git rebase origin
>>>
>>>I meanwhile learned that rebasing doesn't work well with public git
>>>tree. Once you pushed some tree, say, linux-2.6.19 + ipipe-patch1..n
>>>out, you cannot rebase to 2.6.20 + ipipe-patch1..n without breaking the
>>>linear history.
>>>
>>>Either we only push out final trees (but that would lock-out early
>>>testers that may want to pull from devel-head), or we need to evolve
>>>with ipipe patches deeply merged. That means when we have 2.6.19 + ipipe
>>>cleanly on top of it, pulling 2.6.20 origin may cause conflicts (like
>>>the paravirt stuff does on i386 ATM). We would then have to merge the
>>>upstream patches into the I-pipe tree, effectively adopting them to
>>>I-pipe. An extraction of a potential I-pipe patch stack would be more
>>>complicated that way, but not infeasible.
>>>
>>>Comments?
>>
>>I am a complete git newbie myself. But the simpler way I would imagine
>
>
> Then I'm at least not alone. :)
>
>
>>to develop the I-pipe would be to create one branch for each version of
>>the kernel. We would then use a script to generate all architectures
>>specific patches.
>>
>>Porting from one version to the next means merging the difference
>>between the ipipe branch for linux 2.x.y and the linux 2.x.y sources
>>with the linux-2.x.y+1 sources.
>
>
> Of course, we could branch per major release and rebase on top of new
> kernel versions. But that would mean we have to wait until the official
> release to publish our trees. Otherwise, the risk would be the later
> fixes require a rebase.
Is it a big deal ?
>
> The point is likely how to extract ipipe stuff from a fully merged git
> tree. I think this should not be that tricky - as long as every patch in
> some series only touches existing files exclusively (i.e. no two patches
> modify the same source file). Then we could simply apply some diff mask
> (git diff origin..master file1 file2 file3...) to generate those
> individual patches for reference to anyone willing to port stuff to a
> new arch or board.
Yes, what we need is something similar to "svn merge" functionality.
--
Gilles Chanteperdrix
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