linux-kernel - [PATCH v2 35/40] mm/huge_memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap

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Date: Wed, 20 Dec 2023 23:44:59 +0100
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>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Hugh Dickins <hughd@...gle.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Yin Fengwei <fengwei.yin@...el.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Peter Xu <peterx@...hat.com>
Subject: [PATCH v2 35/40] mm/huge_memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap_pmd()

Let's convert copy_huge_pmd() and fixup the comment in copy_huge_pud().
While at it, perform more folio conversion in copy_huge_pmd().

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/huge_memory.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e7bc0f38ddc53..edbca08449357 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1275,6 +1275,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 {
 	spinlock_t *dst_ptl, *src_ptl;
 	struct page *src_page;
+	struct folio *src_folio;
 	pmd_t pmd;
 	pgtable_t pgtable = NULL;
 	int ret = -ENOMEM;
@@ -1341,11 +1342,12 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 	src_page = pmd_page(pmd);
 	VM_BUG_ON_PAGE(!PageHead(src_page), src_page);
+	src_folio = page_folio(src_page);
 
-	get_page(src_page);
-	if (unlikely(page_try_dup_anon_rmap(src_page, true, src_vma))) {
+	folio_get(src_folio);
+	if (unlikely(folio_try_dup_anon_rmap_pmd(src_folio, src_page, src_vma))) {
 		/* Page maybe pinned: split and retry the fault on PTEs. */
-		put_page(src_page);
+		folio_put(src_folio);
 		pte_free(dst_mm, pgtable);
 		spin_unlock(src_ptl);
 		spin_unlock(dst_ptl);
@@ -1454,8 +1456,8 @@ int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	}
 
 	/*
-	 * TODO: once we support anonymous pages, use page_try_dup_anon_rmap()
-	 * and split if duplicating fails.
+	 * TODO: once we support anonymous pages, use
+	 * folio_try_dup_anon_rmap_*() and split if duplicating fails.
 	 */
 	pudp_set_wrprotect(src_mm, addr, src_pud);
 	pud = pud_mkold(pud_wrprotect(pud));
-- 
2.43.0