xen: make install_p2mtop_page() static

Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

arch/x86/xen/mmu.c

@@ -276,7 +276,7 @@ unsigned long get_phys_to_machine(unsigned long pfn)
 EXPORT_SYMBOL_GPL(get_phys_to_machine);
 
 /* install a new p2m_top page */
-bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
+static bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
 {
 	unsigned topidx = p2m_top_index(pfn);
 	unsigned long **pfnp, *mfnp;

arch/x86/xen/mmu.h

@@ -12,7 +12,6 @@ enum pt_level {
 
 
 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);