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Sun, 01 Feb 2026 04:26:51 -0800 (PST) From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org Cc: lorenzo.stoakes@oracle.com, ziy@nvidia.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang Subject: [PATCH mm-new v6 3/5] mm: add folio_test_lazyfree helper Date: Sun, 1 Feb 2026 20:25:52 +0800 Message-ID: <20260201122554.1470071-4-vernon2gm@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260201122554.1470071-1-vernon2gm@gmail.com> References: <20260201122554.1470071-1-vernon2gm@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Vernon Yang Add folio_test_lazyfree() function to identify lazy-free folios to improve code readability. Signed-off-by: Vernon Yang Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Lance Yang Reviewed-by: Dev Jain Reviewed-by: Barry Song --- include/linux/page-flags.h | 5 +++++ mm/rmap.c | 2 +- mm/vmscan.c | 5 ++--- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index f7a0e4af0c73..415e9f2ef616 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -724,6 +724,11 @@ static __always_inline bool folio_test_anon(const stru= ct folio *folio) return ((unsigned long)folio->mapping & FOLIO_MAPPING_ANON) !=3D 0; } =20 +static __always_inline bool folio_test_lazyfree(const struct folio *folio) +{ + return folio_test_anon(folio) && !folio_test_swapbacked(folio); +} + static __always_inline bool PageAnonNotKsm(const struct page *page) { unsigned long flags =3D (unsigned long)page_folio(page)->mapping; diff --git a/mm/rmap.c b/mm/rmap.c index 618df3385c8b..ea55e12b3e87 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -2049,7 +2049,7 @@ static bool try_to_unmap_one(struct folio *folio, str= uct vm_area_struct *vma, } =20 if (!pvmw.pte) { - if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) { + if (folio_test_lazyfree(folio)) { if (unmap_huge_pmd_locked(vma, pvmw.address, pvmw.pmd, folio)) goto walk_done; /* diff --git a/mm/vmscan.c b/mm/vmscan.c index 01d3364fe506..17d039bdbb53 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -963,8 +963,7 @@ static void folio_check_dirty_writeback(struct folio *f= olio, * They could be mistakenly treated as file lru. So further anon * test is needed. */ - if (!folio_is_file_lru(folio) || - (folio_test_anon(folio) && !folio_test_swapbacked(folio))) { + if (!folio_is_file_lru(folio) || folio_test_lazyfree(folio)) { *dirty =3D false; *writeback =3D false; return; @@ -1508,7 +1507,7 @@ static unsigned int shrink_folio_list(struct list_hea= d *folio_list, } } =20 - if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) { + if (folio_test_lazyfree(folio)) { /* follow __remove_mapping for reference */ if (!folio_ref_freeze(folio, 1)) goto keep_locked; --=20 2.51.0