Re: [PATCH 2/2] sched/topology: Expose numa_mask set/clear functions to arch

[Peter Zijlstra]

On Fri, Aug 31, 2018 at 01:12:53PM +0200, Peter Zijlstra wrote:
> NAK, not until you've fixed every cpu_to_node() user in the kernel to
> deal with that mask changing.

Also, what happens if userspace reads that information; uses libnuma and
then you go and shift the world underneath their feet?

> This is absolutely insane.