[PATCH v2 1/5] tools headers arm64: Copy sysreg-defs generation from kernel source

[Mark Brown]

On Wed, Oct 11, 2023 at 05:51:57PM +0100, Marc Zyngier wrote:
> Oliver Upton <oliver.upton at linux.dev> wrote:

> > The system register definitions are now generated with a script over in
> > the kernel sources. Pull a copy into tools in anticipation of updating
> > dependent header files and add a common makefile for generating the
> > header.

> Rather than a copy, which makes the maintenance pretty horrible, why
> don't you just symlink it? Git is perfectly capable of storing them,
> last time I checked.

Do we even need to symlink - as I suggested on the previous version can
we not just reference the script and data file directly in the main
kernel tree?  Like I said then there may be some use case for building
the tools directory outside the kernel source that I'm not aware of but
otherwise I'm not clear that the motivations for copying the actual
headers for use in tools/ apply to these files.

I think the current approach is *fine* (hence my reviewed by) 
given the amount of other copying but it would save a bit of work to not
copy.
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