linux-kernel - [PATCH v2 05/10] mm: memory: use a folio in copy_nonpresent

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Date:   Sat, 4 Nov 2023 11:55:17 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        <linux-s390@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2 05/10] mm: memory: use a folio in copy_nonpresent_pte()

Use a folio in copy_nonpresent_pte() to save one compound_head() call.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/memory.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 1f18ed4a5497..d9314dee355e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -779,7 +779,7 @@ 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 page *page;
+	struct folio *folio;
 	swp_entry_t entry = pte_to_swp_entry(orig_pte);
 
 	if (likely(!non_swap_entry(entry))) {
@@ -801,9 +801,9 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 		}
 		rss[MM_SWAPENTS]++;
 	} else if (is_migration_entry(entry)) {
-		page = pfn_swap_entry_to_page(entry);
+		folio = pfn_swap_entry_to_folio(entry);
 
-		rss[mm_counter(page)]++;
+		rss[mm_counter(&folio->page)]++;
 
 		if (!is_readable_migration_entry(entry) &&
 				is_cow_mapping(vm_flags)) {
@@ -822,7 +822,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 			set_pte_at(src_mm, addr, src_pte, pte);
 		}
 	} else if (is_device_private_entry(entry)) {
-		page = pfn_swap_entry_to_page(entry);
+		folio = pfn_swap_entry_to_folio(entry);
 
 		/*
 		 * Update rss count even for unaddressable pages, as
@@ -833,10 +833,10 @@ 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);
-		rss[mm_counter(page)]++;
+		folio_get(folio);
+		rss[mm_counter(&folio->page)]++;
 		/* Cannot fail as these pages cannot get pinned. */
-		BUG_ON(page_try_dup_anon_rmap(page, false, src_vma));
+		BUG_ON(page_try_dup_anon_rmap(&folio->page, false, src_vma));
 
 		/*
 		 * We do not preserve soft-dirty information, because so
-- 
2.27.0