Hi.

For common config case you can easily check what real differences are 
between configs.

+ kernel upgrade is enough easy: just update common config (be make 
oldconfig) and try to generate other configs (looking on cdiff output - 
for changed/missed lines); and then look on result of 'make oldconfig' + 
maybe correct some subarch-specific settings (for ex., enable new 
drivers for i686/x86_64).

For me, migration to new kernel (when I experimented with different 
versions due to crashes with PPPoE on 4.1) takes max 10-15 minutes - 
even when I switched from 4.1 to old 3.2.

10.03.2016 12:11, Erich Titl пишет:
> Hi Folks
>
> Some time ago I suggested to not keep complete kernel config files, but
> base them on a common basic configuration and diff files, so common
> settings would be kept in a single file only. This has been implemented
> in the config.cdiff files. I was falsely convinced, that common config
> settings could be handled easier that way. I _believe_ now I was wrong.
>
> Working extensively on a few config settings lately I was forced all the
> time to make a detour by generating full kernel config files from the
> cdiff files just to upgrade to new kernel releases and modify small
> settings. This appears orthogonal to the original idea of standardizing
> kernel configs. It also appears that git does not handle the cdiff files
> nicely and therefore it appears not to be obvious to merge or rebase the
> branches.
>
> It also appears that upgrading kernel releases always requires to
> generate a full config to be copied to the new kernel and running make
> oldconfig or olddefconfig, just to be forced to generate a new diff file
> afterwards. So this also defeats to a certain degree the usefulness of
> the kernel diff files.
>
> I would like to discuss here if it would not be better to drop this
> feature as at least for me it does not show any potential to make the
> administration of the kernel config files any easier. I suggest to move
> back to keep complete kernel config files.
>
> cheers
>
> ET
>
>
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