From: Qi Zheng <zhengqi.arch@bytedance.com>
Date: Thu, 26 Sep 2024 06:46:16 +0000 (+0800)
Subject: mm: filemap: filemap_fault_recheck_pte_none() use pte_offset_map_ro_nolock()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=bd6ad65ddcbb2d0aceb843d31d4f1bd8d628200a;p=users%2Fdwmw2%2Flinux.git

mm: filemap: filemap_fault_recheck_pte_none() use pte_offset_map_ro_nolock()

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

Link: https://lkml.kernel.org/r/9f7cbbaa772385ced1b8931b67a8b9d246c9b82d.1727332572.git.zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/filemap.c b/mm/filemap.c
index 36d22968be9a1..630a1c431ea15 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3258,8 +3258,8 @@ 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_ro_nolock(vma->vm_mm, vmf->pmd, vmf->address,
+					&vmf->ptl);
 	if (unlikely(!ptep))
 		return VM_FAULT_NOPAGE;