linux-kernel - [PATCH 13/18] mm: memory: use a folio in insert_page_into_pte

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Message-ID: <20231103140119.2306578-14-wangkefeng.wang@huawei.com>
Date:   Fri, 3 Nov 2023 22:01:14 +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 13/18] mm: memory: use a folio in insert_page_into_pte_locked()

Use mm_counter_file_folio() to save one compound_head() call in
insert_page_into_pte_locked().

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/memory.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 2d90da70a1c8..584fe9a550b9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1845,11 +1845,14 @@ static int validate_page_before_insert(struct page *page)
 static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t *pte,
 			unsigned long addr, struct page *page, pgprot_t prot)
 {
+	struct folio *folio;
+
 	if (!pte_none(ptep_get(pte)))
 		return -EBUSY;
+	folio = page_folio(page);
 	/* Ok, finally just insert the thing.. */
-	get_page(page);
-	inc_mm_counter(vma->vm_mm, mm_counter_file(page));
+	folio_get(folio);
+	inc_mm_counter(vma->vm_mm, mm_counter_file_folio(folio));
 	page_add_file_rmap(page, vma, false);
 	set_pte_at(vma->vm_mm, addr, pte, mk_pte(page, prot));
 	return 0;
-- 
2.27.0