Broken xarray testing in v6.9-rc1

["Liam R. Howlett" <Liam.Howlett@oracle.com>]

Hello,

Testing of the xarray using the radix tree test suite is currently
broken in v6.9-rc1 and beyond.  A bisect resulted in your commit failing
to build:

a60cc288a1a2604bd86d3df129f269887018c3cb is the first bad commit
commit a60cc288a1a2604bd86d3df129f269887018c3cb
Author: Luis Chamberlain <mcgrof@kernel.org>

...

Building in the test suite now fails in linux/tools/testing/radix-tree:

{bisect/bad(bisect)//radix-tree} $ make
cc  -O2 -g -Wall -I. -I../../include -I../../../lib -g -Og -Wall -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined   -c -o xarray.o xarray.c
In file included from xarray.c:18:
../../../lib/test_xarray.c: In function ‘test_get_entry’:
../../../lib/test_xarray.c:750:17: warning: implicit declaration of function ‘schedule’ [-Wimplicit-function-declaration]
  750 |                 schedule();
      |                 ^~~~~~~~
../../../lib/test_xarray.c: In function ‘check_xa_multi_store_adv’:
../../../lib/test_xarray.c:767:24: error: ‘PAGE_SHIFT’ undeclared (first use in this function)
  767 |         index = pos >> PAGE_SHIFT;
      |                        ^~~~~~~~~~
../../../lib/test_xarray.c:767:24: note: each undeclared identifier is reported only once for each function it appears in
make: *** [<builtin>: xarray.o] Error 1

Can you please have a look?

Thanks,
Liam