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SubjectRe: Question: Using floating point in the kernel
On Thu, Sep 21, 2000 at 11:28:26PM +0100, Alan Cox wrote:
> > > > 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

We were actually talking about a hypothetical fully interruptible 2.5 kernel.

-Andi

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