Re: RFC: Starting a stable kernel series off the 2.6 kernel

[Felix Oxley]

On 13 Dec 2005, at 13:17, Horst von Brand wrote:

> Felix Oxley <lkml@xxxxxxxxx> wrote:
> > On 12 Dec 2005, at 17:17, Horst von Brand wrote:
> > > Felix Oxley <lkml@xxxxxxxxx> wrote:
> > >
> > > [...]
> > >
> > > > What if ...
> > > >
> > > > 1. When people make a patch set, if they have encountered any  
> > > > 'bugs'
> > > > they split them out as separate items.
>
> > > No need. Patches are either (a) bug fixes, or (b) infrastructure
> > > changes, or (c) additions (mostly drivers). You only need to pick  
> > > (a)
> > > items. Check.
>
> [...]
>
> > > > 3. When the patch is posted to LKML, it is tagged [PATCH][FIX]  
> > > > in the
> > > > subject line.
> > > >      In the body of the fix would be noted each kernel to which the
> > > >      fix applied e.g [FIX 2.6.11][FIX 2.6.12][FIX 2.6.13][FIX  
> > > > 2.6.14]
>
> > > No do. Problem are the (b) and (c) patches above, they change
> > > whatever the patch applies to and make it not apply anymore. The  
> > > effort
> > > of finding out if the patch is (a) or (c) class, seeing if it is  
> > > really
> > > needed, and modifying it so it applies to your source base is called
> > > "backporting". And it remains hard, thankless work.
> >
> > If this was done for 'trivial' patches of type (a):
> > 	1. Would that make it simple enough for people to actually do it?
> > 	2. Would it be worthwhile? (Are there enough 'trivial fixes'?)
>
> Not all important fixes are "trivial", far from it; so this is rather
> suspect in any case. Changes to the underlying source make even  
> "trivial"
> patches soon not apply anymore. And there still is the job of  
> finding out
> if some patch is or is not necessary...
>
> > I envisaged something like the current Stable series, just for longer
> > than a single release cycle.
>
> Go right ahead. If enough people get interested and work on it, it  
> might
> turn out useful. I rather doubt it, as the current development  
> model is
> exactly geared towards keeping people up to date, not running ancient
> kernels and then jumping a few versions ahead. The problem with  
> doing that
> is that instead of one problem at a time you see a dozen, and then  
> it is
> hard to pin down /when/ it broke (and thus what change is  
> responsible).
> Plus the drift from backported patches, where you can't be sure it / 
> seemed/
> to work because of some random patch.
>
> Again, this development model was tried /hard/ for some 12 years by  
> the
> distributions, and found sorely lacking (and essentially unfixable).

Thank you for your explanation.
I will retire to lurk quietly in my armchair.  :-)

regards,
Felix
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