This is in the hope that it'll lead to a better overall result than plainly
taking [1] and [2] (or whichever re-work thereof).

1: drop paging_get_mode()
2: correct PG_log_dirty definition

Jan

[1] https://lists.xen.org/archives/html/xen-devel/2025-08/msg00050.html
[2] https://lists.xen.org/archives/html/xen-devel/2025-08/msg00051.html