[RFC PATCH 0.9/2] arm64: fpsimd: Expose CPU / FPSIMD state association helpers

[Dave Martin]

On Fri, Feb 23, 2018 at 06:02:53PM +0100, Christoffer Dall wrote:
> On Fri, Feb 16, 2018 at 06:39:30PM +0000, Dave Martin wrote:
> > Oops, forgot to post this patch that goes before patch 1 in the series.
> > 
> > --8<--
> > 
> > Expose an interface for associating an FPSIMD context with a CPU and
> > checking the association, for use by KVM.
> > 
> > Signed-off-by: Dave Martin <Dave.Martin at arm.com>
> > ---

[...]

> > diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c

[...]

> > @@ -996,19 +1002,31 @@ void fpsimd_signal_preserve_current_state(void)
> >  		sve_to_fpsimd(current);
> >  }
> >  
> > +static void __fpsimd_bind_to_cpu(struct fpsimd_last_state_struct *last,
> > +				 struct fpsimd_state *st)
> > +{
> > +	WARN_ON(!in_softirq() || !irqs_disabled());
> 
> You meant && here, right?
> 
> Currently this makes my box explode.
> 
> Thanks,
> -Christoffer

Yup, I had fixed that but didn't have enough to be worth reposting yet...

[...]

Cheers
---Dave