[PATCH 3/3] mm: remove page_mapped()

["David Hildenbrand (Arm)" <david@kernel.org>]

Let's replace the last user of page_mapped() by folio_mapped() so we
can get rid of page_mapped().

Replace the remaining occurrences of page_mapped() in rmap documentation
by folio_mapped().

Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
---
 include/linux/mm.h | 10 ----------
 mm/memory.c        |  2 +-
 mm/rmap.c          |  8 ++++----
 3 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index af23453e9dbd..87fcd068303a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1888,16 +1888,6 @@ static inline bool folio_mapped(const struct folio *folio)
 	return folio_mapcount(folio) >= 1;
 }
 
-/*
- * Return true if this page is mapped into pagetables.
- * For compound page it returns true if any sub-page of compound page is mapped,
- * even if this particular sub-page is not itself mapped by any PTE or PMD.
- */
-static inline bool page_mapped(const struct page *page)
-{
-	return folio_mapped(page_folio(page));
-}
-
 static inline struct page *virt_to_head_page(const void *x)
 {
 	struct page *page = virt_to_page(x);
diff --git a/mm/memory.c b/mm/memory.c
index ea6568571131..99854e6a2793 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5464,7 +5464,7 @@ static vm_fault_t __do_fault(struct vm_fault *vmf)
 	if (unlikely(PageHWPoison(vmf->page))) {
 		vm_fault_t poisonret = VM_FAULT_HWPOISON;
 		if (ret & VM_FAULT_LOCKED) {
-			if (page_mapped(vmf->page))
+			if (folio_mapped(folio))
 				unmap_mapping_folio(folio);
 			/* Retry if a clean folio was removed from the cache. */
 			if (mapping_evict_folio(folio->mapping, folio))
diff --git a/mm/rmap.c b/mm/rmap.c
index 78b7fb5f367c..fb3c351f8c45 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -571,7 +571,7 @@ void __init anon_vma_init(void)
  * In case it was remapped to a different anon_vma, the new anon_vma will be a
  * child of the old anon_vma, and the anon_vma lifetime rules will therefore
  * ensure that any anon_vma obtained from the page will still be valid for as
- * long as we observe page_mapped() [ hence all those page_mapped() tests ].
+ * long as we observe folio_mapped() [ hence all those folio_mapped() tests ].
  *
  * All users of this function must be very careful when walking the anon_vma
  * chain and verify that the page in question is indeed mapped in it
@@ -1999,7 +1999,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
 	/*
 	 * When racing against e.g. zap_pte_range() on another cpu,
 	 * in between its ptep_get_and_clear_full() and folio_remove_rmap_*(),
-	 * try_to_unmap() may return before page_mapped() has become false,
+	 * try_to_unmap() may return before folio_mapped() has become false,
 	 * if page table locking is skipped: use TTU_SYNC to wait for that.
 	 */
 	if (flags & TTU_SYNC)
@@ -2426,7 +2426,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
 	/*
 	 * When racing against e.g. zap_pte_range() on another cpu,
 	 * in between its ptep_get_and_clear_full() and folio_remove_rmap_*(),
-	 * try_to_migrate() may return before page_mapped() has become false,
+	 * try_to_migrate() may return before folio_mapped() has become false,
 	 * if page table locking is skipped: use TTU_SYNC to wait for that.
 	 */
 	if (flags & TTU_SYNC)
@@ -2927,7 +2927,7 @@ static struct anon_vma *rmap_walk_anon_lock(const struct folio *folio,
 
 	/*
 	 * Note: remove_migration_ptes() cannot use folio_lock_anon_vma_read()
-	 * because that depends on page_mapped(); but not all its usages
+	 * because that depends on folio_mapped(); but not all its usages
 	 * are holding mmap_lock. Users without mmap_lock are required to
 	 * take a reference count to prevent the anon_vma disappearing
 	 */

-- 
2.43.0