linux-kernel - Re: Floating point computations in kernel modules

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Date:	Mon, 17 Sep 2007 10:13:43 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Ram <vshrirama@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Floating point computations in kernel modules

On Mon, 2007-09-17 at 19:36 +0530, Ram 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?.
> 
>   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.
> 
> 
> Regards,
> sriram
> -
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Feel free to peruse the Documentation directory before posting. More
specifically, Documentation/DocBook/kernel-hacking.tmpl has a chapter
called 'Some Basic Rules' which addresses your question.

Trond

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