Using floating point calculations in kernel module (x86/amd64)

Hi,

I am trying to build a module with floating point support, but I get the 
following missing symbols:

__adddf3
__floatunsidf
__muldf3

In RTAI I found support for FP, but this is only for saving the state 
bevor calling a procedure which uses FP(?). The procedure, in the module 
I try to build, should be called from a RTAI Task or interrupt procedure.

Searching with google I found only old hints and examples for ARM CPUs.
Is there an example how to compile a module for x86/amd64 (flags for 
gcc) or the kbuild makefiles 
(https://www.kernel.org/doc/Documentation/kbuild/makefiles.txt)?

Thanks for any hints and help.

regards

   W. Holzke
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