linux-kernel - [PATCH v1 2/3] mm/rmap: convert page_move_anon_rmap() to folio_move_anon

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Date:   Mon,  2 Oct 2023 16:29:48 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: [PATCH v1 2/3] mm/rmap: convert page_move_anon_rmap() to folio_move_anon_rmap()

Let's convert it to consume a folio.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/rmap.h |  2 +-
 mm/huge_memory.c     |  2 +-
 mm/hugetlb.c         |  2 +-
 mm/memory.c          |  2 +-
 mm/rmap.c            | 16 +++++++---------
 5 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 064b432a4033..8034eda972e5 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -194,7 +194,7 @@ typedef int __bitwise rmap_t;
 /*
  * rmap interfaces called when adding or removing pte of page
  */
-void page_move_anon_rmap(struct page *, struct vm_area_struct *);
+void folio_move_anon_rmap(struct folio *, struct vm_area_struct *);
 void page_add_anon_rmap(struct page *, struct vm_area_struct *,
 		unsigned long address, rmap_t flags);
 void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 01d0d65ece13..08245226ccb8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1505,7 +1505,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf)
 	if (folio_ref_count(folio) == 1) {
 		pmd_t entry;
 
-		page_move_anon_rmap(page, vma);
+		folio_move_anon_rmap(folio, vma);
 		SetPageAnonExclusive(page);
 		folio_unlock(folio);
 reuse:
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 24591fc145ff..e52c6048e74f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -5461,7 +5461,7 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
 	 */
 	if (folio_mapcount(old_folio) == 1 && folio_test_anon(old_folio)) {
 		if (!PageAnonExclusive(&old_folio->page)) {
-			page_move_anon_rmap(&old_folio->page, vma);
+			folio_move_anon_rmap(old_folio, vma);
 			SetPageAnonExclusive(&old_folio->page);
 		}
 		if (likely(!unshare))
diff --git a/mm/memory.c b/mm/memory.c
index 9de231c92769..1f0e3317cbdd 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3483,7 +3483,7 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf)
 		 * and the folio is locked, it's dark out, and we're wearing
 		 * sunglasses. Hit it.
 		 */
-		page_move_anon_rmap(vmf->page, vma);
+		folio_move_anon_rmap(folio, vma);
 		SetPageAnonExclusive(vmf->page);
 		folio_unlock(folio);
 reuse:
diff --git a/mm/rmap.c b/mm/rmap.c
index 854ccbd66954..37f05f33559b 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1141,19 +1141,17 @@ int folio_total_mapcount(struct folio *folio)
 }
 
 /**
- * page_move_anon_rmap - move a page to our anon_vma
- * @page:	the page to move to our anon_vma
- * @vma:	the vma the page belongs to
+ * folio_move_anon_rmap - move a folio to our anon_vma
+ * @page:	The folio to move to our anon_vma
+ * @vma:	The vma the folio belongs to
  *
- * When a page belongs exclusively to one process after a COW event,
- * that page can be moved into the anon_vma that belongs to just that
- * process, so the rmap code will not search the parent or sibling
- * processes.
+ * When a folio belongs exclusively to one process after a COW event,
+ * that folio can be moved into the anon_vma that belongs to just that
+ * process, so the rmap code will not search the parent or sibling processes.
  */
-void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
+void folio_move_anon_rmap(struct folio *folio, struct vm_area_struct *vma)
 {
 	void *anon_vma = vma->anon_vma;
-	struct folio *folio = page_folio(page);
 
 	VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
 	VM_BUG_ON_VMA(!anon_vma, vma);
-- 
2.41.0