xen idle: make xen-specific macro xen-specific

This macro is only invoked by Xen,
so make its definition specific to Xen.

> set_pm_idle_to_default()
< xen_set_default_idle()

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: xen-devel@lists.xensource.com

arch/x86/include/asm/processor.h

@@ -998,7 +998,11 @@ extern unsigned long arch_align_stack(unsigned long sp);
 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
 
 void default_idle(void);
-bool set_pm_idle_to_default(void);
+#ifdef	CONFIG_XEN
+bool xen_set_default_idle(void);
+#else
+#define xen_set_default_idle 0
+#endif
 
 void stop_this_cpu(void *dummy);
 

arch/x86/kernel/process.c

@@ -396,7 +396,8 @@ void default_idle(void)
 EXPORT_SYMBOL(default_idle);
 #endif
 
-bool set_pm_idle_to_default(void)
+#ifdef CONFIG_XEN
+bool xen_set_default_idle(void)
 {
 	bool ret = !!pm_idle;
 
@@ -404,6 +405,7 @@ bool set_pm_idle_to_default(void)
 
 	return ret;
 }
+#endif
 void stop_this_cpu(void *dummy)
 {
 	local_irq_disable();

arch/x86/xen/setup.c

@@ -561,7 +561,7 @@ void __init xen_arch_setup(void)
 #endif
 	disable_cpuidle();
 	disable_cpufreq();
-	WARN_ON(set_pm_idle_to_default());
+	WARN_ON(xen_set_default_idle());
 	fiddle_vdso();
 #ifdef CONFIG_NUMA
 	numa_off = 1;