Problems with disabling Optimization

Dear All,

               Disabling O2 and Os on Kernel building, I am getting the
following error. Can you please help me in debugging this.
       Saw some info on the net, but could not resolve it.

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

Regards,
Prabhu
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