I don't remember. Probably there was some reason in an earlier version
of the code. The !! could be probably removed now.
>
> 2: What happens when the user's signal handler decides it wants to save
> the FPU state itself (after all) and proceed with some FPU use. Will
> sigreturn restore the user-saved FPU state? Just curious.
Nope it won't because there is no saved state. The previous context's FPU
state will be silently corrupted.
-Andi
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