diff --git a/mm/mmap.c b/mm/mmap.c
index 91eaa0c9e7ee..308a43eabd83 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1447,44 +1447,6 @@ static vm_fault_t special_mapping_fault(struct vm_fault *vmf)
 	return VM_FAULT_SIGBUS;
 }
 
-static struct vm_area_struct *__install_special_mapping(
-	struct mm_struct *mm,
-	unsigned long addr, unsigned long len,
-	vm_flags_t vm_flags, void *priv,
-	const struct vm_operations_struct *ops)
-{
-	int ret;
-	struct vm_area_struct *vma;
-
-	vma = vm_area_alloc(mm);
-	if (unlikely(vma == NULL))
-		return ERR_PTR(-ENOMEM);
-
-	vma_set_range(vma, addr, addr + len, 0);
-	vm_flags |= mm->def_flags | VM_DONTEXPAND;
-	if (pgtable_supports_soft_dirty())
-		vm_flags |= VM_SOFTDIRTY;
-	vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
-
-	vma->vm_ops = ops;
-	vma->vm_private_data = priv;
-
-	ret = insert_vm_struct(mm, vma);
-	if (ret)
-		goto out;
-
-	vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT);
-
-	perf_event_mmap(vma);
-
-	return vma;
-
-out:
-	vm_area_free(vma);
-	return ERR_PTR(ret);
-}
-
 bool vma_is_special_mapping(const struct vm_area_struct *vma,
 	const struct vm_special_mapping *sm)
 {
diff --git a/mm/vma.c b/mm/vma.c
index 6e62642e00a2..c591eb410674 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -3399,3 +3399,41 @@ __weak unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
 {
 	return vma_kernel_pagesize(vma);
 }
+
+struct vm_area_struct *__install_special_mapping(
+	struct mm_struct *mm,
+	unsigned long addr, unsigned long len,
+	vm_flags_t vm_flags, void *priv,
+	const struct vm_operations_struct *ops)
+{
+	int ret;
+	struct vm_area_struct *vma;
+
+	vma = vm_area_alloc(mm);
+	if (unlikely(vma == NULL))
+		return ERR_PTR(-ENOMEM);
+
+	vma_set_range(vma, addr, addr + len, 0);
+	vm_flags |= mm->def_flags | VM_DONTEXPAND;
+	if (pgtable_supports_soft_dirty())
+		vm_flags |= VM_SOFTDIRTY;
+	vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+
+	vma->vm_ops = ops;
+	vma->vm_private_data = priv;
+
+	ret = insert_vm_struct(mm, vma);
+	if (ret)
+		goto out;
+
+	vm_stat_account(mm, vma->vm_flags, len >> PAGE_SHIFT);
+
+	perf_event_mmap(vma);
+
+	return vma;
+
+out:
+	vm_area_free(vma);
+	return ERR_PTR(ret);
+}
diff --git a/mm/vma.h b/mm/vma.h
index 47fe35e5307e..14f026bf3be4 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -775,4 +775,9 @@ static inline bool map_deny_write_exec(const vma_flags_t *old,
 }
 #endif
 
+struct vm_area_struct *__install_special_mapping(struct mm_struct *mm,
+		unsigned long addr, unsigned long len,
+		vm_flags_t vm_flags, void *priv,
+		const struct vm_operations_struct *ops);
+
 #endif	/* __MM_VMA_H */