Re: kernel-2.6 cvs patches

On Tue, 2004-06-22 at 00:51, Oliver Schwartz wrote:
> > drivers/video/xbox/{conexant,focus}.c make heavy use of
> > floating-point arithmetic, which, in-kernel, is a Bad Idea (tm). 
> 
> Can you give more information / links? Is there no safe way at all to 
> use fixed point arithmetics in kernel?
> 
You can use fixed-point but not floating point, see
linux-2.4.26/Documentation/DocBook/kernel-hacking.tmpl:

* No floating point or MMX
The FPU context is not saved; even in user context the FPU state
probably won't correspond with the current process: you would mess with
some user process' FPU state.  If you really want to do this, you would
have to explicitly save/restore the full FPU state (and avoid context
switches).  It is generally a bad idea; use fixed point arithmetic
first.



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