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

[Mark Brown]

On Thu, May 16, 2024 at 07:17:00PM +0200, Ard Biesheuvel wrote:

> This is going to be tricky to track down if it takes 10G of data to reproduce.

OTOH it's 10G on hardware which does help but yeah.

> 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.

I agree that this is the quickest and simplest thing to do as a fix.
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