linux-kernel - [PATCH 04/14] mm: filemap: filemap_fault_recheck_pte_none() use pte_offset_map_readonly

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Message-Id: <c1dbbc9022c9d8d4736d1751678076a2afa1366f.1724226076.git.zhengqi.arch@bytedance.com>
Date: Wed, 21 Aug 2024 16:18:47 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: david@...hat.com,
	hughd@...gle.com,
	willy@...radead.org,
	muchun.song@...ux.dev,
	vbabka@...nel.org,
	akpm@...ux-foundation.org,
	rppt@...nel.org,
	vishal.moola@...il.com,
	peterx@...hat.com,
	ryan.roberts@....com
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH 04/14] mm: filemap: filemap_fault_recheck_pte_none() use pte_offset_map_readonly_nolock()

In filemap_fault_recheck_pte_none(), we just do pte_none() check, so
convert it to using pte_offset_map_readonly_nolock().

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 mm/filemap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index d87c858465962..491eb92d6db1f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3228,8 +3228,8 @@ static vm_fault_t filemap_fault_recheck_pte_none(struct vm_fault *vmf)
 	if (!(vmf->flags & FAULT_FLAG_ORIG_PTE_VALID))
 		return 0;
 
-	ptep = pte_offset_map_nolock(vma->vm_mm, vmf->pmd, vmf->address,
-				     &vmf->ptl);
+	ptep = pte_offset_map_readonly_nolock(vma->vm_mm, vmf->pmd,
+					      vmf->address, &vmf->ptl);
 	if (unlikely(!ptep))
 		return VM_FAULT_NOPAGE;
 
-- 
2.20.1