cherry-pick request for "arm64/fpsimd: Avoid erroneous elide of user state reload"

cherry-pick request for "arm64/fpsimd: Avoid erroneous elide of user state reload"

[Florian Klink]

Hey,

I got encouraged to send another email here from
https://github.com/tpwrules/nixos-apple-silicon/issues/200.

"arm64/fpsimd: Avoid erroneous elide of user state reload" / 
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e92bee9f861b466c676f0200be3e46af7bc4ac6b
fixes a data corruption issue with dm-crypt on aarch64, reproducible on
the mainline Linux kernel (not just asahi specific!).

This list has been included as Cc on this commit, but it'd be very nice
to make sure this already lands in 6.9.2, due to its data corruption
nature.

Thanks,
Florian

Re: cherry-pick request for "arm64/fpsimd: Avoid erroneous elide of user state reload"

[Greg KH]

On Sat, May 25, 2024 at 02:36:41PM +0200, Florian Klink wrote:
> 
> Hey,
> 
> I got encouraged to send another email here from
> https://github.com/tpwrules/nixos-apple-silicon/issues/200.
> 
> "arm64/fpsimd: Avoid erroneous elide of user state reload" / https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e92bee9f861b466c676f0200be3e46af7bc4ac6b
> fixes a data corruption issue with dm-crypt on aarch64, reproducible on
> the mainline Linux kernel (not just asahi specific!).
> 
> This list has been included as Cc on this commit, but it'd be very nice
> to make sure this already lands in 6.9.2, due to its data corruption
> nature.

Now queued up for the next release.  As this fixes an issue that has
been there for a while (back to 6.8 days), I can't just add it to an
untested -rc cycle.

thanks,

greg k-h