[PATCH v2] vdso: Remove struct getcpu_cache

[H. Peter Anvin]

On 2025-10-13 10:14, Andy Lutomirski wrote:
> 
> I don't actually remember whether the kernel ever used this.  It's
> possible that there are ancient kernels where passing a wild, non-null
> pointer would blow up.  But it's certainly safe to pass null, and it's
> certainly safe for the kernel to ignore the parameter.
> 

One could imagine an architecture which would have to execute an actual system
call wanting to use this, but on x86 it is pointless -- even the LSL trick is
much faster than a system call, and once you account for whatever hassle you
would have to deal with do make the cache make sense (probably having a global
generation number and/or a timestamp to expire it) it well and truly makes no
sense.

	-hpa