1 files changed, 20 insertions, 52 deletions

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 1fb26d0e30b6..5a2bbe0c4fff 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -87,7 +87,11 @@ EXPORT_SYMBOL(cpu_online_map);
 cpumask_t cpu_callin_map;
 cpumask_t cpu_callout_map;
 EXPORT_SYMBOL(cpu_callout_map);
+#ifdef CONFIG_HOTPLUG_CPU
+cpumask_t cpu_possible_map = CPU_MASK_ALL;
+#else
 cpumask_t cpu_possible_map;
+#endif
 EXPORT_SYMBOL(cpu_possible_map);
 static cpumask_t smp_commenced_mask;
 
@@ -1074,6 +1078,16 @@ void *xquad_portio;
 EXPORT_SYMBOL(xquad_portio);
 #endif
 
+/*
+ * Fall back to non SMP mode after errors.
+ *
+ */
+static __init void disable_smp(void)
+{
+        cpu_set(0, cpu_sibling_map[0]);
+        cpu_set(0, cpu_core_map[0]);
+}
+
 static void __init smp_boot_cpus(unsigned int max_cpus)
 {
         int apicid, cpu, bit, kicked;
@@ -1086,7 +1100,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         printk("CPU%d: ", 0);
         print_cpu_info(&cpu_data[0]);
 
-        boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
         boot_cpu_logical_apicid = logical_smp_processor_id();
         x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
 
@@ -1098,68 +1111,27 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         cpus_clear(cpu_core_map[0]);
         cpu_set(0, cpu_core_map[0]);
 
+        map_cpu_to_logical_apicid();
+
         /*
          * If we couldn't find an SMP configuration at boot time,
          * get out of here now!
          */
         if (!smp_found_config && !acpi_lapic) {
                 printk(KERN_NOTICE "SMP motherboard not detected.\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                if (APIC_init_uniprocessor())
-                        printk(KERN_NOTICE "Local APIC not detected."
-                                           " Using dummy APIC emulation.\n");
-                map_cpu_to_logical_apicid();
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
+                disable_smp();
                 return;
         }
 
         /*
-         * Should not be necessary because the MP table should list the boot
-         * CPU too, but we do it for the sake of robustness anyway.
-         * Makes no sense to do this check in clustered apic mode, so skip it
-         */
-        if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
-                printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
-                                boot_cpu_physical_apicid);
-                physid_set(hard_smp_processor_id(), phys_cpu_present_map);
-        }
-
-        /*
-         * If we couldn't find a local APIC, then get out of here now!
-         */
-        if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !cpu_has_apic) {
-                printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
-                        boot_cpu_physical_apicid);
-                printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
-                return;
-        }
-
-        verify_local_APIC();
-
-        /*
          * If SMP should be disabled, then really disable it!
          */
-        if (!max_cpus) {
-                smp_found_config = 0;
-                printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
-                smpboot_clear_io_apic_irqs();
-                phys_cpu_present_map = physid_mask_of_physid(0);
-                cpu_set(0, cpu_sibling_map[0]);
-                cpu_set(0, cpu_core_map[0]);
+        if (!max_cpus || (enable_local_apic < 0)) {
+                printk(KERN_INFO "SMP mode deactivated.\n");
+                disable_smp();
                 return;
         }
 
-        connect_bsp_APIC();
-        setup_local_APIC();
-        map_cpu_to_logical_apicid();
-
-
         setup_portio_remap();
 
         /*
@@ -1240,10 +1212,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
         cpu_set(0, cpu_sibling_map[0]);
         cpu_set(0, cpu_core_map[0]);
 
-        smpboot_setup_io_apic();
-
-        setup_boot_APIC_clock();
-
         /*
          * Synchronize the TSC with the AP
          */