Re: [PATCH 1/4] x86/fpu: Add kernel_fpu_begin_mask() to selectively initialize state
On Sun, Jan 17, 2021 at 10:20:38PM -0800, Andy Lutomirski wrote:
> - Code that wants MMX doesn't want need MXCSR or FCW initialized. > _mmx_memcpy(), for example, can run before CR4.OSFXSR gets set, and > initializing MXCSR will fail.