linux-kernel - [PATCH v2 36/40] mm/memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap

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Message-ID: <20231220224504.646757-37-david@redhat.com>
Date: Wed, 20 Dec 2023 23:45:00 +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 36/40] mm/memory: page_try_dup_anon_rmap() -> folio_try_dup_anon_rmap_pte()

Let's convert copy_nonpresent_pte(). While at it, perform some more
folio conversion.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/memory.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index dc2a8e6858179..d995ead7a3933 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -785,6 +785,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	unsigned long vm_flags = dst_vma->vm_flags;
 	pte_t orig_pte = ptep_get(src_pte);
 	pte_t pte = orig_pte;
+	struct folio *folio;
 	struct page *page;
 	swp_entry_t entry = pte_to_swp_entry(orig_pte);
 
@@ -829,6 +830,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		}
 	} else if (is_device_private_entry(entry)) {
 		page = pfn_swap_entry_to_page(entry);
+		folio = page_folio(page);
 
 		/*
 		 * Update rss count even for unaddressable pages, as
@@ -839,10 +841,10 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		 * for unaddressable pages, at some point. But for now
 		 * keep things as they are.
 		 */
-		get_page(page);
+		folio_get(folio);
 		rss[mm_counter(page)]++;
 		/* Cannot fail as these pages cannot get pinned. */
-		BUG_ON(page_try_dup_anon_rmap(page, false, src_vma));
+		folio_try_dup_anon_rmap_pte(folio, page, src_vma);
 
 		/*
 		 * We do not preserve soft-dirty information, because so
@@ -956,7 +958,7 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
 		 * future.
 		 */
 		folio_get(folio);
-		if (unlikely(page_try_dup_anon_rmap(page, false, src_vma))) {
+		if (unlikely(folio_try_dup_anon_rmap_pte(folio, page, src_vma))) {
 			/* Page may be pinned, we have to copy. */
 			folio_put(folio);
 			return copy_present_page(dst_vma, src_vma, dst_pte, src_pte,
-- 
2.43.0