add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/mm/userfaultfd.c
..
..
@@ -63,7 +63,7 @@
63
63
 	pte_t _dst_pte, *dst_pte;
64
64
 	bool writable = dst_vma->vm_flags & VM_WRITE;
65
65
 	bool vm_shared = dst_vma->vm_flags & VM_SHARED;
66
-	bool page_in_cache = page->mapping;
66
+	bool page_in_cache = page_mapping(page);
67
67
 	spinlock_t *ptl;
68
68
 	struct inode *inode;
69
69
 	pgoff_t offset, max_off;