--- mm/mremap.c

+++ mm/mremap.c

@@ -92,7 +92,9 @@ static void move_ptes(struct vm_area_str

*/

mapping = vma->vm_file->f_mapping;

spin_lock(&mapping->i_mmap_lock);

- new_vma->vm_truncate_count = 0;

+ if (new_vma->vm_truncate_count &&

+ new_vma->vm_truncate_count != vma->vm_truncate_count)

+ new_vma->vm_truncate_count = 0;

}

/*