Why is -msoft-float used in Kernel compilation?

[Michel Lanners]

On  13 Feb, this message from Gavriel State echoed through cyberspace:
> 
> I can understand using -msoft-float if CONFIG__8xx is on,
> but why use it when compiling for 60x or 7x0 CPUs?

I've heard something about a 'no floiting point in kernel' rule, and
I've tried compiling without -msoft-float.... it does boot, but it's an
ugly sight... fp warning messages all over!

I have, however, never seen a clear explanation of why that rule
exists...

Any guru around?

Michel

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