[PATCH] c-user: Document all configuration options

[Sebastian Huber]

On 31/03/2020 17:13, Joel Sherrill wrote:

> At least the MPCI receive server extra thread stack is
> only valid to use when multiprocessing (not SMP) is enabled.
> This applies to any of the MPCI parameters. This should be
> in the notes for those.
>
> I don't know offhand if any of the others should mention a configure
> option they relate to.
Ok, I will fix this in a follow up patch which covers all configuration 
options which depend on configure defines.
>
> This is not the patch to fix this but we document the mechanics but
> don't give guidance on system integration decisions like selecting
> scheduling algorithms or tuning the block device buffering.
We can add this to the group descriptions or a general option which 
enables a feature, e.g. CONFIGURE_APPLICATION_NEEDS_LIBBLOCK.