x86: early check if a system is numaq

so we could fall back to one node numa.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/mpparse.c

@@ -70,7 +70,10 @@ static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
 		return;
 	}
 #ifdef CONFIG_X86_NUMAQ
-	apicid = mpc_apic_id(m, translation_table[mpc_record]);
+	if (found_numaq)
+		apicid = mpc_apic_id(m, translation_table[mpc_record]);
+	else
+		apicid = m->mpc_apicid;
 #else
 	apicid = m->mpc_apicid;
 #endif
@@ -91,7 +94,8 @@ static void __init MP_bus_info(struct mpc_config_bus *m)
 	str[6] = 0;
 
 #ifdef CONFIG_X86_NUMAQ
-	mpc_oem_bus_info(m, str, translation_table[mpc_record]);
+	if (found_numaq)
+		mpc_oem_bus_info(m, str, translation_table[mpc_record]);
 #else
 	printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
 #endif
@@ -112,7 +116,8 @@ static void __init MP_bus_info(struct mpc_config_bus *m)
 #endif
 	} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 #ifdef CONFIG_X86_NUMAQ
-		mpc_oem_pci_bus(m, translation_table[mpc_record]);
+		if (found_numaq)
+			mpc_oem_pci_bus(m, translation_table[mpc_record]);
 #endif
 		clear_bit(m->mpc_busid, mp_bus_not_pci);
 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
@@ -321,6 +326,9 @@ static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
 {
 	if (strncmp(oem, "IBM NUMA", 8))
 		printk("Warning!  May not be a NUMA-Q system!\n");
+	else
+		found_numaq = 1;
+
 	if (mpc->mpc_oemptr)
 		smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
 				 mpc->mpc_oemsize);

arch/x86/kernel/numaq_32.c

@@ -31,9 +31,12 @@
 #include <asm/numaq.h>
 #include <asm/topology.h>
 #include <asm/processor.h>
+#include <asm/mpspec.h>
 
 #define	MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
 
+int found_numaq;
+
 /*
  * Function: smp_dump_qct()
  *
@@ -67,13 +70,24 @@ static void __init smp_dump_qct(void)
 	}
 }
 
-/*
- * Unlike Summit, we don't really care to let the NUMA-Q
- * fall back to flat mode.  Don't compile for NUMA-Q
- * unless you really need it!
- */
+static __init void early_check_numaq(void)
+{
+	/*
+	 * Find possible boot-time SMP configuration:
+	 */
+	early_find_smp_config();
+	/*
+	 * get boot-time SMP configuration:
+	 */
+	if (smp_found_config)
+		early_get_smp_config();
+}
+
 int __init get_memcfg_numaq(void)
 {
+	early_check_numaq();
+	if (!found_numaq)
+		return 0;
 	smp_dump_qct();
 	return 1;
 }

include/asm-x86/mpspec.h

@@ -21,11 +21,11 @@ extern int pic_mode;
 /* Each PCI slot may be a combo card with its own bus.  4 IRQ pins per slot. */
 #define MAX_IRQ_SOURCES (MAX_MP_BUSSES * 4)
 
+#endif
+
 extern void early_find_smp_config(void);
 extern void early_get_smp_config(void);
 
-#endif
-
 #if defined(CONFIG_MCA) || defined(CONFIG_EISA)
 extern int mp_bus_id_to_type[MAX_MP_BUSSES];
 #endif

include/asm-x86/numaq.h

@@ -28,6 +28,7 @@
 
 #ifdef CONFIG_X86_NUMAQ
 
+extern int found_numaq;
 extern int get_memcfg_numaq(void);
 
 /*