[PATCH 6/9] kernel/x86: enable x32 support for amd64

[Elliott Mitchell]

On Fri, Apr 28, 2023 at 11:00:43AM -0600, Philip Prindeville wrote:
> My own experience disagrees.
> 
> I spent 17 months bringing up a Xeon-D based traffic shaper for 40Gb/s of traffic in a radio base station.
> 
> And yes, when collected crunched traffic statistics, it did use more than 4GB of address space to do so.

I can believe that.  Though I kind of doubt this is the typical usage of
OpenWRT.  A kernel can have both amd64 and x32 enabled.  My thinking was
in typical usage most programs won't be that large and thus x32 is
smaller and faster.

Note, enabling CONFIG_X86_X32 does not force the use of x32 userspace,
it merely allows it.  The observed kernel runtime was 4KB larger which
translates to +1-8191 bytes.


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