Re: [PATCH 05/22] x86/fpu: Remove fpu->initialized usage in copy_fpstate_to_sigframe()

Borislav Petkov
2019-01-22T13:40:15Z

On Mon, Jan 21, 2019 at 12:21:17PM +0100, Oleg Nesterov wrote:
> And in any case I do not understand the idea to use the second
> in-kernel struct fpu. A signal handler can be interrupted by another
> signal, this will need to save/restore the FPU state again.

Well, we were just speculating whether doing that would simplify the
code around get_sigframe() et al. But if that is an ABI, then we can't
really touch it.

Btw, where is that whole ABI deal about saving FPU regs on the user
signal stack documented?

Thx.

--
Regards/Gruss,
Boris.

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