Re: [PATCH 14/22] x86/fpu: Eager switch PKRU state

[Sebastian Andrzej Siewior]

On 2019-03-12 17:06:18 [-0700], Dave Hansen wrote:
> Thanks for doing this.  I'll see if I can dig into the test case and
> figure out why it's not doing what I expected.  It might be that the CPU
> _could_ go back to the init state but chooses not to, or that something
> else is taking us out of the init state before we reach the kernel code
> in question.

I'm going to drop that WARN_ON() check. The reason is that we are fully
preemptible during fpstate_init() and a context switch during memset()
and fpstate_init_xstate() triggers this warning.

Sebastian