On Tue, Dec 21, 2021 at 10:16 AM Arnd Bergmann <arnd@xxxxxxxx> wrote: > I think for CPUs that can use LPAE, we want to eventually move to the 4G:4G > memory model, which in turn depends on having the kernel in vmalloc space, as > implemented by Linus Walleij in > https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git/log/?h=kernel-in-vmalloc-v5.14-rc1 Yeah I'm still working on this series. The 4/4 split works pretty well, but it breaks KASan and I was in the process of fixing that when I left for parental leave. The reason it breaks would be related to KASan not expecting executable code in the vmalloc area, and since the shadowing algorithm is a simple pointer offset, and since we go to lengths to chisel shadow memory out of lowmem at a fixed offset from TEXT_OFFSET, we have a problem. The patch "KASAN horror" shows what I am trying to do to fix it, it's "just" some hard work missing. Yours, Linus Walleij
