Re: [PATCH v4 04/10] x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly

From: Yu-cheng Yu
Date: Mon May 02 2016 - 12:02:21 EST

On Fri, Apr 29, 2016 at 05:36:48PM -0700, Dave Hansen wrote:
> If may_copy_fpregs_to_sigframe() were called from a slightly different
> context, or if we change the call-site, what breaks?
> In other words. if we can still "may_copy_fpregs_to_sigframe()" no
> matter the state of fpu.fpstate_active, then I don't think we should be
> checking it in may_copy_fpregs_to_sigframe().

Do you mean, don't check fpu.fpstate_active here?