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CNty8MNp03mFZnzumfN25UmTU8tFuNj+B1T8I29cXtPbpP8FuzrJdrylucrHvtX5NI8ibsJTLDY5dh/EgyWuhnmXErh91wGYHiVjYf7zDBywox3HZARVdslS+4y13dFRmyubqfLdg6HDnWw08h5nbNpSy/Pn1R5ejfBjKh/wjFPCWJQi5LrN5IrADTApics01O+VMXKnKRyPCzvjWaOQsvZgEUTB9FRZ3cILWumUYoK08mU6/xRGr0o4q6KGd1An5hFEkzbEpVcwMwhZiG204g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Sep 8, 2026 at 12:56 PM EDT, David Hildenbrand (Arm) wrote: > On 9/8/26 04:56, Zi Yan wrote: >> After the changes of the prior commits, page/folio->private !=3D NULL is= now >> equivalent to checking PG_private. >>=20 >> Stop checking PG_private on pages and folios and use page/folio->private >> instead, except swapcache and hugetlb folios, because the former uses a >> field (swp_entry_t swap) overlapping with ->private and the latter sets = its >> flags in ->private. Exclude swapcache and hugetlb when the code is meant= to >> check PG_private only. PG_swapcache and folio->swap.val cannot be set/cl= ear >> as a whole, so excluding swapcache with folio_test_swapcache() is not >> reliable. Instead, use folio_test_swapbacked(), since PG_swapbacked is >> stable when a folio is added to/removed from swapcache. >>=20 >> folio_expected_ref_count() can be called without folio lock, so annotate >> folio_test_private() with data_race() to avoid triggering race condition >> checks. While at it, annotate folio->mapping too. Add data_race() >> annotation for other lockless callers too. >>=20 >> folio_set/clear_private() and Set/ClearPagePrivate() become no-ops. >> PG_private is no longer checked at page free time. >>=20 >> Remove KPF_PRIVATE since PG_private is no longer used. >>=20 >> Assisted-by: Claude:claude-opus-4-8 >> Assisted-by: Codex:gpt-5 >> Signed-off-by: Zi Yan >> To: Andrew Morton >> To: David Hildenbrand >> To: Steven Rostedt >> To: Masami Hiramatsu >> To: Lorenzo Stoakes >> To: "Matthew Wilcox (Oracle)" >> To: Jan Kara >> To: Johannes Weiner >> Cc: "Liam R. Howlett" >> Cc: Vlastimil Babka >> Cc: Mike Rapoport >> Cc: Suren Baghdasaryan >> Cc: Michal Hocko >> Cc: Mathieu Desnoyers >> Cc: Zi Yan >> Cc: Baolin Wang >> Cc: Nico Pache >> Cc: Ryan Roberts >> Cc: Dev Jain >> Cc: Barry Song >> Cc: Lance Yang >> Cc: Usama Arif >> Cc: Matthew Brost >> Cc: Joshua Hahn >> Cc: Rakie Kim >> Cc: Byungchul Park >> Cc: Gregory Price >> Cc: Ying Huang >> Cc: Alistair Popple >> Cc: Qi Zheng >> Cc: Shakeel Butt >> Cc: Kairui Song >> Cc: Axel Rasmussen >> Cc: Yuanchu Xie >> Cc: Wei Xu >> Cc: linux-kernel@vger.kernel.org >> Cc: linux-fsdevel@vger.kernel.org >> Cc: linux-mm@kvack.org >> Cc: linux-trace-kernel@vger.kernel.org >> --- > > [...] > >> /* !PageAnon && !swapper_space */ >> diff --git a/mm/vmscan.c b/mm/vmscan.c >> index 40d3f1b48a74c..9348ebf9de882 100644 >> --- a/mm/vmscan.c >> +++ b/mm/vmscan.c >> @@ -978,7 +978,8 @@ static void folio_check_dirty_writeback(struct folio= *folio, >> *writeback =3D folio_test_writeback(folio); >> =20 >> /* Verify dirty/writeback state if the filesystem supports it */ >> - if (!folio_test_private(folio)) >> + if (!(folio_test_private(folio) && !folio_test_swapbacked(folio) && >> + !folio_test_hugetlb(folio))) > > Now that I read that check ... a fourth time? a fifth? I stopped counting= :) > > Should we have a (in light of folio_attach_private()): > > static inline bool folio_has_attached_private(const struct folio *folio) > { > /* Careful, we might get called on unlocked folios. */ > if (!data_race(folio->private)) > return false; > /* On some folios ->private is used for different purposes. */ > return !folio_test_swapbacked(folio) && !folio_test_hugetlb(folio); > } > > Of course, adding some nice documentation what having attached private me= ans? Will squash the next one into this one and use folio_has_attached_private() instead of folio_test_fs_private(), like we discussed in Patch 10. --=20 Best Regards, Yan, Zi