linux-kernel - [PATCH] mm: remove unneeded PageAnon check in restore_exclusive

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Date:   Sat, 16 Jul 2022 16:18:16 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] mm: remove unneeded PageAnon check in restore_exclusive_pte()

When code reaches here, the page must be !PageAnon. There's no need to
check PageAnon again. Remove it.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index f671b2dce1fe..d98f89cee3e9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -753,7 +753,7 @@ static void restore_exclusive_pte(struct vm_area_struct *vma,
 		 * Currently device exclusive access only supports anonymous
 		 * memory so the entry shouldn't point to a filebacked page.
 		 */
-		WARN_ON_ONCE(!PageAnon(page));
+		WARN_ON_ONCE(1);
 
 	set_pte_at(vma->vm_mm, address, ptep, pte);
 
-- 
2.23.0