[PATCH 3/9] mm: Remove folio_prep_large_rmappable()

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

Now that prep_compound_page() initialises folio->_deferred_list,
folio_prep_large_rmappable()'s only purpose is to set the large_rmappable
flag, so inline it into the two callers.  Take the opportunity to convert
the large_rmappable definition from PAGEFLAG to FOLIO_FLAG and remove
the existance of PageTestLargeRmappable and friends.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/huge_mm.h    | 3 ---
 include/linux/page-flags.h | 4 ++--
 mm/huge_memory.c           | 9 +--------
 mm/internal.h              | 3 ++-
 4 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index de0c89105076..0e16451adaba 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -263,7 +263,6 @@ unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma,
 unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
 		unsigned long len, unsigned long pgoff, unsigned long flags);
 
-void folio_prep_large_rmappable(struct folio *folio);
 bool can_split_folio(struct folio *folio, int *pextra_pins);
 int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
 		unsigned int new_order);
@@ -411,8 +410,6 @@ static inline unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma,
 	return 0;
 }
 
-static inline void folio_prep_large_rmappable(struct folio *folio) {}
-
 #define transparent_hugepage_flags 0UL
 
 #define thp_get_unmapped_area	NULL
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index dc1607f1415e..8d0e6ce25ca2 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -869,9 +869,9 @@ static inline void ClearPageCompound(struct page *page)
 	BUG_ON(!PageHead(page));
 	ClearPageHead(page);
 }
-PAGEFLAG(LargeRmappable, large_rmappable, PF_SECOND)
+FOLIO_FLAG(large_rmappable, FOLIO_SECOND_PAGE)
 #else
-TESTPAGEFLAG_FALSE(LargeRmappable, large_rmappable)
+FOLIO_FLAG_FALSE(large_rmappable)
 #endif
 
 #define PG_head_mask ((1UL << PG_head))
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 04fb994a7b0b..5cb025341d52 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -788,13 +788,6 @@ struct deferred_split *get_deferred_split_queue(struct folio *folio)
 }
 #endif
 
-void folio_prep_large_rmappable(struct folio *folio)
-{
-	if (!folio || !folio_test_large(folio))
-		return;
-	folio_set_large_rmappable(folio);
-}
-
 static inline bool is_transparent_hugepage(struct folio *folio)
 {
 	if (!folio_test_large(folio))
@@ -2861,7 +2854,7 @@ static void __split_huge_page_tail(struct folio *folio, int tail,
 	clear_compound_head(page_tail);
 	if (new_order) {
 		prep_compound_page(page_tail, new_order);
-		folio_prep_large_rmappable(new_folio);
+		folio_set_large_rmappable(new_folio);
 	}
 
 	/* Finally unfreeze refcount. Additional reference from page cache. */
diff --git a/mm/internal.h b/mm/internal.h
index 10895ec52546..ee669963db15 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -513,7 +513,8 @@ static inline struct folio *page_rmappable_folio(struct page *page)
 {
 	struct folio *folio = (struct folio *)page;
 
-	folio_prep_large_rmappable(folio);
+	if (folio && folio_test_large(folio))
+		folio_set_large_rmappable(folio);
 	return folio;
 }
 
-- 
2.43.0