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. Good mailing practices for 400: avoid top-posting and trim the reply.