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 36d22968be9a1e10da42927dd627d3f22c3a747b..630a1c431ea150a6ee9fa74cf3586c21ccd8f9ee 100644 (file)
--- 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;