Comment # 48 on bug 1211796 from Michal Suchanek

(In reply to Jan Engelhardt from comment #47)
> >scripts/depmod.sh effectively calls 'depmod -b $INSTALL_MOD_PATH'
> >but `make modules_instdall` won't install under usr/ prefix.
> 
> The following works for me on the pristine kmod-30:
> 
>   make modules_install INSTALL_MOD_PATH=/Someroot/usr
> 
That's probably because you have upstream, unpatched kmod installed.

However, the goal is to refer to modules directly through the /usr path, not
the compatibility symlink. For that kmod needs to be taught about that extra
path element.

The kmod that expects /usr to be part of the module path would search for
modules under /Someroot/usr/usr/lib/modules, and not find any.