On Mon, Aug 14, 2023 at 8:27 PM Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> wrote: > > Move PG_writeback into bottom byte so that it can use PG_waiters in a > later patch. Move PG_head into bottom byte as well to match with where > 'order' is moving next. Sorry if that's obvious, but why do we want to move PG_head to where 'order' is moving? I thought we would want to avoid an overlap to avoid mistaking the first tail page of a high-order compound page as a head page?
