[PATCH 5/8] mm: Convert hugetlb_page_mapping_lock_write to folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

The page is only used to get the mapping, so the folio will do just
as well.  Both callers already have a folio available, so this saves
a call to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/hugetlb.h | 6 +++---
 mm/hugetlb.c            | 6 +++---
 mm/memory-failure.c     | 2 +-
 mm/migrate.c            | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 77b30a8c6076..acb1096ecdaa 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -175,7 +175,7 @@ u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
 		      unsigned long addr, pud_t *pud);
 
-struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
+struct address_space *hugetlb_folio_mapping_lock_write(struct folio *folio);
 
 extern int sysctl_hugetlb_shm_group;
 extern struct list_head huge_boot_pages[MAX_NUMNODES];
@@ -298,8 +298,8 @@ static inline unsigned long hugetlb_total_pages(void)
 	return 0;
 }
 
-static inline struct address_space *hugetlb_page_mapping_lock_write(
-							struct page *hpage)
+static inline struct address_space *hugetlb_folio_mapping_lock_write(
+							struct folio *folio)
 {
 	return NULL;
 }
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bb17e5c22759..0e464a8f1aa9 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2178,13 +2178,13 @@ EXPORT_SYMBOL_GPL(PageHuge);
 /*
  * Find and lock address space (mapping) in write mode.
  *
- * Upon entry, the page is locked which means that page_mapping() is
+ * Upon entry, the folio is locked which means that folio_mapping() is
  * stable.  Due to locking order, we can only trylock_write.  If we can
  * not get the lock, simply return NULL to caller.
  */
-struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage)
+struct address_space *hugetlb_folio_mapping_lock_write(struct folio *folio)
 {
-	struct address_space *mapping = page_mapping(hpage);
+	struct address_space *mapping = folio_mapping(folio);
 
 	if (!mapping)
 		return mapping;
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 27dc21063552..fe4959e994d0 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1624,7 +1624,7 @@ static bool hwpoison_user_mappings(struct page *p, unsigned long pfn,
 		 * TTU_RMAP_LOCKED to indicate we have taken the lock
 		 * at this higher level.
 		 */
-		mapping = hugetlb_page_mapping_lock_write(hpage);
+		mapping = hugetlb_folio_mapping_lock_write(folio);
 		if (mapping) {
 			try_to_unmap(folio, ttu|TTU_RMAP_LOCKED);
 			i_mmap_unlock_write(mapping);
diff --git a/mm/migrate.c b/mm/migrate.c
index 73a052a382f1..0aef867d600b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1425,7 +1425,7 @@ static int unmap_and_move_huge_page(new_folio_t get_new_folio,
 			 * semaphore in write mode here and set TTU_RMAP_LOCKED
 			 * to let lower levels know we have taken the lock.
 			 */
-			mapping = hugetlb_page_mapping_lock_write(&src->page);
+			mapping = hugetlb_folio_mapping_lock_write(src);
 			if (unlikely(!mapping))
 				goto unlock_put_anon;
 
-- 
2.43.0