Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs

[Peter Zijlstra]

On Wed, Mar 05, 2025 at 10:07:45AM +0100, Ingo Molnar wrote:
> > From: Eric Biggers <ebiggers@xxxxxxxxxx>

> > Alternatives considered:
> > 
> > - Make kernel-mode FPU sections fully preemptible.  This would require
> >   growing task_struct by another struct fpstate which is more than 2K.
> 
> So that's something that will probably happen once the kernel is built 
> using APX anyway?

ISTR looking into this at some point for RT. I also have vague memories
of other architectures doing something similar, but its all a long time
ago.