Re: Question: Using floating point in the kernel

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Thu Sep 21 2000 - 18:28:26 EDT

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> > > It is sufficient when you do tsk->flags |= PF_USEDFPU first.
> >
> > Unless you sleep
>
> Unless I'm missing something the lazy FPU state save in the 2.4 switch_to will
> do the right thing at least on x86. Your kernel FPU state will overwrite the
> user FPU state in current, but that's ok because it is undefined anyways
> (and you restore the correct state when you wake up again)

2.4 maybe. Im not totally sure on that code. 2.2 wont

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