Re: [PATCH RESEND] xor: add missing vzeroupper to AVX code

On Wed, Sep 02, 2026 at 09:23:59AM -0700, Eric Biggers wrote:

quoted

Can we do kernel_avx_{begin,end} instead of having to open code
and document this everywhere, please?

Again, there are cases in the kernel where both AVX and SSE are used
within a single kernel-mode FPU section, or where a CPU feature check
occurs within the section and one or the other is used.  So that
abstraction will not work as-is,

So don't use it for that one case (which I've seen, but make it two or
three and the same still applies), and everyone else gets to use the
easy case.

and it would be different from all
userspace code as well.

I don't know how you defined "all".  Almost no userspace code has
kernel_fpu_{begin,end} to start with.  The one code base I've recently
ported to the kernel that has it, also has kernel_avx_{begin,end}
already.