[PATCH 27/28] mm: Convert deferred_split_huge_page() to deferred_split_folio()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Now that both callers use a folio, pass the folio in and save a
call to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 Documentation/mm/transhuge.rst | 6 +++---
 include/linux/huge_mm.h        | 4 ++--
 mm/huge_memory.c               | 3 +--
 mm/rmap.c                      | 2 +-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/Documentation/mm/transhuge.rst b/Documentation/mm/transhuge.rst
index 03bbd0a19041..a9608fe51649 100644
--- a/Documentation/mm/transhuge.rst
+++ b/Documentation/mm/transhuge.rst
@@ -153,8 +153,8 @@ clear where references should go after split: it will stay on the head page.
 Note that split_huge_pmd() doesn't have any limitations on refcounting:
 pmd can be split at any point and never fails.
 
-Partial unmap and deferred_split_huge_page()
-============================================
+Partial unmap and deferred_split_folio()
+========================================
 
 Unmapping part of THP (with munmap() or other way) is not going to free
 memory immediately. Instead, we detect that a subpage of THP is not in use
@@ -166,6 +166,6 @@ the place where we can detect partial unmap. It also might be
 counterproductive since in many cases partial unmap happens during exit(2) if
 a THP crosses a VMA boundary.
 
-The function deferred_split_huge_page() is used to queue a page for splitting.
+The function deferred_split_folio() is used to queue a folio for splitting.
 The splitting itself will happen when we get memory pressure via shrinker
 interface.
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index b9978978a160..70bd867eba94 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -187,7 +187,7 @@ static inline int split_huge_page(struct page *page)
 {
 	return split_huge_page_to_list(page, NULL);
 }
-void deferred_split_huge_page(struct page *page);
+void deferred_split_folio(struct folio *folio);
 
 void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 		unsigned long address, bool freeze, struct folio *folio);
@@ -340,7 +340,7 @@ static inline int split_huge_page(struct page *page)
 {
 	return 0;
 }
-static inline void deferred_split_huge_page(struct page *page) {}
+static inline void deferred_split_folio(struct folio *folio) {}
 #define split_huge_pmd(__vma, __pmd, __address)	\
 	do { } while (0)
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index c23b0e01734b..868fcccdff72 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2815,9 +2815,8 @@ void free_transhuge_page(struct page *page)
 	free_compound_page(page);
 }
 
-void deferred_split_huge_page(struct page *page)
+void deferred_split_folio(struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct deferred_split *ds_queue = get_deferred_split_queue(folio);
 #ifdef CONFIG_MEMCG
 	struct mem_cgroup *memcg = folio_memcg(folio);
diff --git a/mm/rmap.c b/mm/rmap.c
index 462b334d6842..7f76fc40af9a 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1427,7 +1427,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
 		 */
 		if (folio_test_pmd_mappable(folio) && folio_test_anon(folio))
 			if (!compound || nr < nr_pmdmapped)
-				deferred_split_huge_page(&folio->page);
+				deferred_split_folio(folio);
 	}
 
 	/*
-- 
2.35.1