Re: [PATCH] x86/alternatives: Disable KASAN on text_poke_early() in apply_alternatives()

On Tue, Oct 10, 2023 at 12:10:56PM +0200, Peter Zijlstra wrote:

Now, obviously you really don't want boot_cpu_has() in __VIRTUAL_MASK_SHIFT, that would be really bad (Linus recently complained about how horrible the code-gen is around this already, must not make it far worse).

You mean a MOV (%rip) and a TEST are so horrible there because it is a mask?

I'd experiment with it when I get a chance...