linux-kernel - [PATCH v2 2/6] mm: memory: use a folio in validate_page_before

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Message-ID: <20231113152222.3495908-3-wangkefeng.wang@huawei.com>
Date:   Mon, 13 Nov 2023 23:22:18 +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>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2 2/6] mm: memory: use a folio in validate_page_before_insert()

Use a folio in validate_page_before_insert() to save two
compound_head() calls.

Reviewed-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
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 c32954e16b28..379354b35891 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1841,9 +1841,12 @@ pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
 
 static int validate_page_before_insert(struct page *page)
 {
-	if (PageAnon(page) || PageSlab(page) || page_has_type(page))
+	struct folio *folio = page_folio(page);
+
+	if (folio_test_anon(folio) || folio_test_slab(folio) ||
+	    page_has_type(page))
 		return -EINVAL;
-	flush_dcache_page(page);
+	flush_dcache_folio(folio);
 	return 0;
 }
 
-- 
2.27.0