[POWERPC] Wrap cpu_die() with CONFIG_HOTPLUG_CPU

Per email discussion, it appears that rtas_stop_self()
and pSeries_mach_cpu_die() should not be compiled if
CONFIG_HOTPLUG_CPU is not defined. This patch adds
#ifdefs around these bits of code.
Signed-off-by: NLinas Vepstas <linas@austin.ibm.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/rtas.c

@@ -810,9 +810,9 @@ asmlinkage int ppc_rtas(struct rtas_args __user *uargs)
 	return 0;
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 /* This version can't take the spinlock, because it never returns */
-
-struct rtas_args rtas_stop_self_args = {
+static struct rtas_args rtas_stop_self_args = {
 	/* The token is initialized for real in setup_system() */
 	.token = RTAS_UNKNOWN_SERVICE,
 	.nargs = 0,
@@ -834,6 +834,7 @@ void rtas_stop_self(void)
 
 	panic("Alas, I survived.\n");
 }
+#endif
 
 /*
  * Call early during boot, before mem init or bootmem, to retrieve the RTAS

arch/powerpc/platforms/pseries/setup.c

@@ -347,6 +347,7 @@ static int __init pSeries_init_panel(void)
 }
 arch_initcall(pSeries_init_panel);
 
+#ifdef CONFIG_HOTPLUG_CPU
 static void pSeries_mach_cpu_die(void)
 {
 	local_irq_disable();
@@ -357,6 +358,9 @@ static void pSeries_mach_cpu_die(void)
 	BUG();
 	for(;;);
 }
+#else
+#define pSeries_mach_cpu_die NULL
+#endif
 
 static int pseries_set_dabr(unsigned long dabr)
 {

include/asm-powerpc/rtas.h

@@ -54,8 +54,6 @@ struct rtas_args {
 	rtas_arg_t *rets;     /* Pointer to return values in args[]. */
 };  
 
-extern struct rtas_args rtas_stop_self_args;
-
 struct rtas_t {
 	unsigned long entry;		/* physical address pointer */
 	unsigned long base;		/* physical address pointer */