xen: make install_p2mtop_page() static

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index fcff8c8..0096909 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -275,8 +275,8 @@
 }
 EXPORT_SYMBOL_GPL(get_phys_to_machine);
 
-/* install a  new p2m_top page */
-bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
+/* install a new p2m_top page */
+static bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
 {
 	unsigned topidx = p2m_top_index(pfn);
 	unsigned long **pfnp, *mfnp;
diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h
index fa938c4..537bb9a 100644
--- a/arch/x86/xen/mmu.h
+++ b/arch/x86/xen/mmu.h
@@ -12,7 +12,6 @@
 
 
 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
-bool install_p2mtop_page(unsigned long pfn, unsigned long *p);
 
 void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);