Comment # 10 on bug 1137361 from Marco Vedovati

(In reply to Michal Kube��ek from comment #8)
> Scripts config-merge and config-diff in scripts/ subdirectory can be used to
> merge a diff config with the base config and to create a diff from two full
> configs. But in general, preferred way to update configs is using the
> run_oldconfig.sh script.
> 
> In general, all you need is to use scripts/sequence_patch.sh to get expanded
> tree, switch to the directory with it and run ./run_oldconfig.sh from there,
> possibly with --flavor and/or -a (--arch) options.

This is what I was doing already. The problem is that when adding a new flavor,
what is generated is just a delta compared to the default flavor.

Having a new flavor with an empty file would be equivalent to use default.

So you need to identify in the default config all the non-essential config
lines that can be shaved off, and add them in the new flavor in the form of
#CONFIG_...  is not set" lines.

This require some deep knowledge of the architecture.