Re: [PATCH 1/5] Revert "x86/fpu: Refine and simplify the magic number check during signal return"

[Sasha Levin]

> This reverts commit dc8aa31a7ac2 ("x86/fpu: Refine and simplify the
> magic number check during signal return").
>
> The reverted commit broke applications that construct signal frames in
> userspace (such as CRIU and gVisor) if the frame's xstate size is
> smaller than the kernel's fpstate->user_size.

Holding this off on the stable side until the revert (and the rest of
the series) lands in mainline. Once it's upstream, please ping with the
mainline SHAs and the list of trees you want it on, and I'll queue it.

--
Thanks,
Sasha