Hi,
On 9/17/07, Ram <[email protected]> wrote:
> Hi,
>
> I am trying to write a driver which uses double, float. I am using
> an arm11 with gcc 3.4.4
>
> When i try to compile my modules (with float variables) i get the error
>
> WARNING: "__extendsfdf2" undefined!
> WARNING: "__mulsf3"undefined!
> WARNING: "__fixsfsi"undefined!
> WARNING: "__floatsisf"undefined!
>
> Can we use float, double in kernel modules?.
>
in general you shouldn't use floating point in the kernel since there's no
portable way which will work among different architectures.
> Obviously it is a linking error, I am using soft-float. I tried with
> -msoft-float but got the same result.
>
> I suspect that its a toolchain issue. However i am able to compile
> my applications
> with float, double variables.
>
>
> Please do advice.
>
if you need a solution inkernel best would be to try to get around by converting
your algorithm to integer.
although you might have a look at:
http://www.fi.muni.cz/~xslaby/unpr.html
http://www.mail-archive.com/linuxppc-embedded%40ozlabs.org/msg01291.html
Markus
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