You're posting that email way, way out of context. I cringe whenever I see that linked. "Userspace" here refers to the kernel's policy about certain APIs. They

You're posting that email way, way out of context. I cringe whenever I see that linked. "Userspace" here refers to the kernel's policy about certain APIs. They won't change fbdev at this point but downstreams could always compile it out. It's also an extremely unprofessional email and Linus should have never sent it. You can still use DRM/KMS to drive "low-tech FB interfaces" and it's actually better because you don't have to deal with the weirdness of the fbdev ioctls.