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Sat, 21 Feb 2026 01:40:02 -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 v8 3/4] mm: add folio_test_lazyfree helper Date: Sat, 21 Feb 2026 17:39:17 +0800 Message-ID: <20260221093918.1456187-4-vernon2gm@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260221093918.1456187-1-vernon2gm@gmail.com> References: <20260221093918.1456187-1-vernon2gm@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 0C156A000B X-Stat-Signature: j1premn5uog7dzjz9ci47ri594zwa73h X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1771666803-804953 X-HE-Meta: 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 p5PH1KtM PQ1SZrlIRq1TONTBkxxi1KQzFL0tHm1GTx5EasNk4R+c0VsiqTYcq0l/pZR0/Sd4wJ8fqV157CavPA655x3zch3zmy/2hDjzWZ/2MUgWpIeZhePzLGaZW+62X6newEJob8iMAeV2kar4I8r5WL4MVy1M3tneTPlgVPQ99h7Jglbn5WZXh82WAs4g/ke2VwT5kkznW X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 fb6a83fe88b0..0426cac91c0b 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 struct folio *folio) return ((unsigned long)folio->mapping & FOLIO_MAPPING_ANON) != 0; } +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 = (unsigned long)page_folio(page)->mapping; diff --git a/mm/rmap.c b/mm/rmap.c index 0f00570d1b9e..bff8f222004e 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -2046,7 +2046,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, } 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 6a87ac7be43c..9ce3f54f43b8 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -963,8 +963,7 @@ static void folio_check_dirty_writeback(struct folio *folio, * 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 = false; *writeback = false; return; @@ -1508,7 +1507,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list, } } - 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; -- 2.51.0