[PATCH] ia64: compile fix for HP Sim serial/console

I was getting annoyed at having to mess around with the HP Simulator
stuff when trying to compile generic kernels.  Here's the fix that I
came up with.  It basically makes the HP Sim console another config
option that depends on the HP sim serial code.

It also sticks a couple of run-time checks in the init functions to only
setup and run the code on hpsim machines.

arch/ia64/hp/sim/Kconfig

@@ -7,7 +7,10 @@ config HP_SIMETH
 
 config HP_SIMSERIAL
 	bool "Simulated serial driver support"
-	default y if IA64_GENERIC
+
+config HP_SIMSERIAL_CONSOLE
+	bool "Console for HP simulator"
+	depends on HP_SIMSERIAL
 
 config HP_SIMSCSI
 	bool "Simulated SCSI disk"

arch/ia64/hp/sim/Makefile

@@ -7,9 +7,10 @@
 # Copyright (C) Srinivasa Thirumalachar (sprasad@engr.sgi.com)
 #
 
-obj-y := hpsim_console.o hpsim_irq.o hpsim_setup.o
+obj-y := hpsim_irq.o hpsim_setup.o
 obj-$(CONFIG_IA64_GENERIC) += hpsim_machvec.o
 
 obj-$(CONFIG_HP_SIMETH)	+= simeth.o
 obj-$(CONFIG_HP_SIMSERIAL) += simserial.o
+obj-$(CONFIG_HP_SIMSERIAL_CONSOLE) += hpsim_console.o
 obj-$(CONFIG_HP_SIMSCSI) += simscsi.o

arch/ia64/hp/sim/hpsim_setup.c

@@ -5,6 +5,7 @@
  *	David Mosberger-Tang <davidm@hpl.hp.com>
  * Copyright (C) 1999 Vijay Chander <vijay@engr.sgi.com>
  */
+#include <linux/config.h>
 #include <linux/console.h>
 #include <linux/init.h>
 #include <linux/kdev_t.h>
@@ -24,8 +25,6 @@
 
 #include "hpsim_ssc.h"
 
-extern struct console hpsim_cons;
-
 /*
  * Simulator system call.
  */
@@ -56,5 +55,11 @@ hpsim_setup (char **cmdline_p)
 {
 	ROOT_DEV = Root_SDA1;		/* default to first SCSI drive */
 
+#ifdef CONFIG_HP_SIMSERIAL_CONSOLE
+	{
+		extern struct console hpsim_cons;
+		if (ia64_platform_is("hpsim"))
 			register_console(&hpsim_cons);
+	}
+#endif
 }

arch/ia64/hp/sim/simserial.c

@@ -1025,6 +1025,9 @@ simrs_init (void)
 	int			i;
 	struct serial_state	*state;
 
+	if (!ia64_platform_is("hpsim"))
+		return -ENODEV;
+
 	show_serial_version();
 
 	/* Initialize the tty_driver structure */