xen/x86: Fixup misc stale issues

* Dom0 does now have an arch_config passed.
 * hypercall() and smp_alloc_memory() no longer exist.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

xen/arch/x86/setup.c

@@ -1541,11 +1541,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
     if ( opt_dom0pvh )
         domcr_flags |= DOMCRF_pvh | DOMCRF_hap;
 
-    /*
-     * Create initial domain 0.
-     * x86 doesn't support arch-configuration. So it's fine to pass
-     * NULL.
-     */
+    /* Create initial domain 0. */
     dom0 = domain_create(0, domcr_flags, 0, &config);
     if ( IS_ERR(dom0) || (alloc_dom0_vcpu0(dom0) == NULL) )
         panic("Error creating domain 0");

xen/include/asm-x86/processor.h

@@ -612,8 +612,6 @@ struct stubs {
 DECLARE_PER_CPU(struct stubs, stubs);
 unsigned long alloc_stub_page(unsigned int cpu, unsigned long *mfn);
 
-extern int hypercall(void);
-
 int cpuid_hypervisor_leaves( uint32_t idx, uint32_t sub_idx,
           uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx);
 int rdmsr_hypervisor_regs(uint32_t idx, uint64_t *val);

xen/include/asm-x86/smp.h

@@ -23,8 +23,6 @@
 /*
  * Private routines/data
  */
- 
-extern void smp_alloc_memory(void);
 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
 DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);