Problems with disabling Optimization

[Ali Bahar]

>                Disabling O2 and Os on Kernel building, I am getting the
> following error. Can you please help me in debugging this.

> ERROR: "intel_gmbus_is_forced_bit" [drivers/gpu/drm/i915/i915.ko] undefined!
> ERROR: "__udivdi3" [drivers/gpu/drm/i915/i915.ko] undefined!
> make[2]: *** [__modpost] Error 1
> make[1]: *** [modules] Error 2
> make: *** [sub-make] Error 2

It's been a while since I (last) disabled these, but I did not run
into a compilation error because of it. And I recall the box needing
i915, too.  Is this a case of simply needing to do a _clean_ build?

later,
ali
PS IIRC, a CONFIG option exists _but_ I also had to edit a makefile to
get everything disabled -- though don't ask me when and where that
was!  :-)