v4.19.13 snapshot.
diff --git a/arch/um/include/asm/mmu.h b/arch/um/include/asm/mmu.h
new file mode 100644
index 0000000..da70544
--- /dev/null
+++ b/arch/um/include/asm/mmu.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __ARCH_UM_MMU_H
+#define __ARCH_UM_MMU_H
+
+#include <mm_id.h>
+#include <asm/mm_context.h>
+
+typedef struct mm_context {
+ struct mm_id id;
+ struct uml_arch_mm_context arch;
+ struct page *stub_pages[2];
+} mm_context_t;
+
+extern void __switch_mm(struct mm_id * mm_idp);
+
+/* Avoid tangled inclusion with asm/ldt.h */
+extern long init_new_ldt(struct mm_context *to_mm, struct mm_context *from_mm);
+extern void free_ldt(struct mm_context *mm);
+
+#endif