selftests: kho: test with deferred struct page init

Enable DEFERRED_STRUCT_PAGE_INIT which depends on SMP.
Also enable additional debugging options.

Signed-off-by: Michal Clapinski <mclapinski@google.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Link: https://patch.msgid.link/20260423122538.140993-4-mclapinski@google.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Author: mclapinski

tools/testing/selftests/kho/vmtest.sh

@@ -59,10 +59,14 @@ function build_kernel() {
 	tee "$kconfig" > "$kho_config" <<EOF
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_KEXEC_HANDOVER=y
+CONFIG_KEXEC_HANDOVER_DEBUG=y
 CONFIG_KEXEC_HANDOVER_DEBUGFS=y
 CONFIG_TEST_KEXEC_HANDOVER=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_VM_PGFLAGS=y
+CONFIG_SMP=y
+CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
 $arch_kconfig
 EOF