Re: [Q] merging from one (kernel) stable to another?

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On Monday 30 March 2009 14:19:08 Johannes Sixt wrote:
> Brian Foster schrieb:
>[ ... ]
> >   Thanks for the suggestion.  I'll have to experiment,
> >  but off-the-top-of-my-head, I think I do want a merge,
> >  so that it's easier to track the history of individual
> >  local changes.  Having said that, I'm not entirely sure
> >  I follow your suggestions.  What I think you mean is:
> > 
> >   (1)  Create a patch which is all (local) changes
> >          (née diffs) from linux-mips.21 to our.21;
> >   (2)  Checkout linux-mips.26.8 (e.g.);
> >   (3)  Apply the patch created in (1), above;
> 
> format-patch creates a patch series.  You apply the whole series,
> e.g. with 'git am'. But for this workflow you could also just create
> a single patch and apply it to linux-mips.26.8, just as you wrote.

  Point taken.  I was being a bit sloppy there; I well know
 `git format-patch' (which we use in our internal workflow)
 generates a patch series, and that `git am' applies them.
 Apologies for the confusion.  Sorry!

> The important point is that you forge this tree into the shape that
> you finally want to have in the merge (that you will make later).
> At this point you only have to deal with conflicts and regressions
> that arise from your own changes, which makes your life much easier
> than if you also had to deal with conflicts that are outside your
> own changes.

  Gottcha.  Thanks for clarifying.

> >   (4)  Tag the result `like-this';
> >   (5)  Checkout our.21;  and
> >   (6)  Merge with `like-this'.
> 
> No, you merge with linux-mips.26.8. This will again give you a lot
> of conflicts. But you do
> 
>    (7) git checkout like-this -- .
> 
> that is, you overwrite the merge result (that has conflicts) with
> your known-good tree called "like-this". This resolves all conflicts
> in the way that you wanted them.

  Ah!  Neat.  I think I get it (er, git it?) now ....
 Many thanks for your patient and very helpful replies!
cheers!
	-blf-

-- 
“How many surrealists does it take to   | Brian Foster
 change a lightbulb? Three. One calms   | somewhere in south of France
 the warthog, and two fill the bathtub  |   Stop E$$o (ExxonMobil)!
 with brightly-coloured machine tools.” |      http://www.stopesso.com
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