Re: Compiling the ieee80211 Source Codes

On Wed, 2006-11-22 at 11:33 +0000, Siva Sivavakeesar wrote:
> After having added some mathematical operations involving simple
> division, subtraction and multiplication on float variables in
> ieee802_rx.c, when I try to compile the ieee80211 source, I am getting
> the follwing compilation warning and as a result it is very difficult
> to install the ieee80211.ko module.
> 
>  ***Warning: " _addsf3" .[../ieee80211.ko] undefined!
>  ***Warning: " _mulsf3" .[../ieee80211.ko] undefined!
>  ***Warning: " _truncdfsf2" .[../ieee80211.ko] undefined!
>  ***Warning: " _floatsisf" .[../ieee80211.ko] undefined!
>  ***Warning: " _gtsf2" .[../ieee80211.ko] undefined!
>  ***Warning: " _adddf3" .[../ieee80211.ko] undefined!
>  ***Warning: " _extendsfdf2" .[../ieee80211.ko] undefined!
>  ***Warning: " _floatsidf" .[../ieee80211.ko] undefined!
>  ***Warning: " _divsf3" .[../ieee80211.ko] undefined! 

If you want to use floating point in kernel, you need to use it as
below:

kernel_fpu_begin();
...
kernel_fpu_end();

BTW, it's not recommended to use floating point in kernel unless you
have to. Because it will impact the performance of the system.

Thanks,
-yi

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