On Sat, Mar 14, 2020 at 09:59:12PM +0000, Wei Yang wrote: > Function add_to_swap_cache() and delete_from_swap_cache() are counter > parts, while currently they use different way to count page. > > It doesn't break any thing because we only have two size for PageAnon, > but this is confusing and not a good practice. > > This patch corrects it by both using compound_nr(). You're converting in the wrong direction. hpage_nr_pages() is optimised away when CONFIG_TRANSPARENT_HUGEPAGE is undefined, whereas compound_nr() is not. I also have this patch pending: http://git.infradead.org/users/willy/linux-dax.git/commitdiff/192b635b428ae74f680574cdcc3d5e9d213fcb64
