[PATCH v2 23/29] mm/page-alloc: remove PageMappingFlags()
From: David Hildenbrand <hidden>
Date: 2025-07-04 10:26:37
Also in:
linux-doc, linux-fsdevel, linux-mm, lkml, virtualization
Subsystem:
memory management, memory management - page allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Linus Torvalds
As PageMappingFlags() now only indicates anon (incl. KSM) folios, we can now simply check for PageAnon() and remove PageMappingFlags(). ... and while at it, use the folio instead and operate on folio->mapping. Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Lorenzo Stoakes <redacted> Reviewed-by: Harry Yoo <redacted> Signed-off-by: David Hildenbrand <redacted> --- include/linux/page-flags.h | 5 ----- mm/page_alloc.c | 7 +++---- 2 files changed, 3 insertions(+), 9 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 094c8605a879e..fc159fa945351 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h@@ -723,11 +723,6 @@ static __always_inline bool folio_mapping_flags(const struct folio *folio) return ((unsigned long)folio->mapping & PAGE_MAPPING_FLAGS) != 0; } -static __always_inline bool PageMappingFlags(const struct page *page) -{ - return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) != 0; -} - static __always_inline bool folio_test_anon(const struct folio *folio) { return ((unsigned long)folio->mapping & PAGE_MAPPING_ANON) != 0;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4aefeb2ae927f..78ddf1d43c6c1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -1375,10 +1375,9 @@ __always_inline bool free_pages_prepare(struct page *page, (page + i)->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; } } - if (PageMappingFlags(page)) { - if (PageAnon(page)) - mod_mthp_stat(order, MTHP_STAT_NR_ANON, -1); - page->mapping = NULL; + if (folio_test_anon(folio)) { + mod_mthp_stat(order, MTHP_STAT_NR_ANON, -1); + folio->mapping = NULL; } if (unlikely(page_has_type(page))) /* Reset the page_type (which overlays _mapcount) */
--
2.49.0