On 1/18/19 1:37 PM, Sebastian Andrzej Siewior wrote: > On 2019-01-18 13:17:28 [-0800], Dave Hansen wrote: >> On 1/18/19 1:14 PM, Sebastian Andrzej Siewior wrote: >>> The kernel saves task's FPU registers on user's signal stack before >>> entering the signal handler. Can we avoid that and have in-kernel memory >>> for that? Does someone rely on the FPU registers from the task in the >>> signal handler? >> >> This is part of our ABI for *sure*. > > I missed that part. I will try to look it up and look see if says > something about optional part. > But ABI means we must keep doing it even if there are no users? I'd bet a large sum of money there are users. Google for 'uc_mcontext fpregs'.
