i386: Panic the system when a NUMA kernel doesn't run on IBM NUMA

It has been broken forever anywhere else and is not too useful
anyways so best to disable it.

Signed-off-by: Andi Kleen <ak@suse.de>

---
 arch/i386/Kconfig       |    3 +++
 arch/i386/kernel/srat.c |    8 ++++++++
 2 files changed, 11 insertions(+)

Index: linux/arch/i386/kernel/srat.c
===================================================================
--- linux.orig/arch/i386/kernel/srat.c
+++ linux/arch/i386/kernel/srat.c
@@ -327,6 +327,14 @@ int __init get_memcfg_from_srat(void)
 	int tables = 0;
 	int i = 0;
 
+	extern int use_cyclone;
+	if (use_cyclone == 0) {
+		/* Make sure user sees something */
+		static const char s[] __initdata = "Not an IBM x440/NUMAQ. Don't use i386 CONFIG_NUMA anywhere else.";
+		early_printk(s);
+		panic(s);
+	}
+
 	if (ACPI_FAILURE(acpi_find_root_pointer(ACPI_PHYSICAL_ADDRESSING,
 						rsdp_address))) {
 		printk("%s: System description tables not found\n",
Index: linux/arch/i386/Kconfig
===================================================================
--- linux.orig/arch/i386/Kconfig
+++ linux/arch/i386/Kconfig
@@ -517,6 +517,9 @@ config NUMA
 	depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
 	default n if X86_PC
 	default y if (X86_NUMAQ || X86_SUMMIT)
+	help
+		NUMA support. Note this only works on IBM x440 or IBM NUMAQ.
+		Don't try to use it anywhere else.
 
 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
 	depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)