[BUG] dm-crypt broken after 2632e2521769 ("arm64: fpsimd: Implement lazy restore for kernel mode FPSIMD")

[Will Deacon]

On Thu, May 16, 2024 at 07:17:00PM +0200, Ard Biesheuvel wrote:
> On Thu, 16 May 2024 at 18:25, Marc Zyngier <maz at kernel.org> wrote:
> >
> > + Ard, Broonie
> >
> 
> Ugh.
> 
> This is going to be tricky to track down if it takes 10G of data to reproduce.
> 
> For the time being, maybe we should just revert and take the time to
> really dig into this?
> 
> It appears to revert cleanly, and the performance gain of the
> optimization was never quantified in the first place, so perhaps we
> should get some numbers too when we bring it back.

Given that 6.8 is affected too, I'll queue up the revert with a cc stable
now.

Will