[PATCH v2 03/10] um: vdso: Implement __vdso_getcpu() via syscall

[Johannes Berg]

On Sun, 2025-08-10 at 13:51 +0800, Tiwei Bie wrote:
> From: Tiwei Bie <tiwei.btw at antgroup.com>
> 
> We are going to support SMP in UML, so we can not hard code
> the CPU and NUMA node in __vdso_getcpu() anymore.

Correct. But does that mean we actually have to implement it via syscall
in the VDSO? That seems a bit odd? ARM doesn't seem to have getcpu in
the VDSO at all, for example, so could we do the same and just remove
it?

johannes