2 files changed, 47 insertions, 9 deletions

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 3095bb71eaed..c3a252b1a8be 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1480,7 +1480,6 @@ void __cpuinit generic_processor_info(int apicid, int version)
 {
         int cpu;
         cpumask_t tmp_map;
-        physid_mask_t phys_cpu;
 
         /*
          * Validate version
@@ -1493,9 +1492,6 @@ void __cpuinit generic_processor_info(int apicid, int version)
         }
         apic_version[apicid] = version;
 
-        phys_cpu = apicid_to_cpu_present(apicid);
-        physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
-
         if (num_processors >= NR_CPUS) {
                 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
                         "  Processor ignored.\n", NR_CPUS);
@@ -1512,17 +1508,19 @@ void __cpuinit generic_processor_info(int apicid, int version)
         cpus_complement(tmp_map, cpu_present_map);
         cpu = first_cpu(tmp_map);
 
-        if (apicid == boot_cpu_physical_apicid)
+        physid_set(apicid, phys_cpu_present_map);
+        if (apicid == boot_cpu_physical_apicid) {
                 /*
                  * x86_bios_cpu_apicid is required to have processors listed
                  * in same order as logical cpu numbers. Hence the first
                  * entry is BSP, and so on.
                  */
                 cpu = 0;
-
+        }
         if (apicid > max_physical_apicid)
                 max_physical_apicid = apicid;
 
+#ifdef CONFIG_X86_32
         /*
          * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
          * but we need to work other dependencies like SMP_SUSPEND etc
@@ -1542,7 +1540,9 @@ void __cpuinit generic_processor_info(int apicid, int version)
                         def_to_bigsmp = 1;
                 }
         }
-#ifdef CONFIG_SMP
+#endif
+
+#if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
         /* are we being called early in kernel startup? */
         if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
                 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
@@ -1555,6 +1555,7 @@ void __cpuinit generic_processor_info(int apicid, int version)
                 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
         }
 #endif
+
         cpu_set(cpu, cpu_possible_map);
         cpu_set(cpu, cpu_present_map);
 }
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 0d969103fce7..76c20773bedf 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1215,6 +1215,8 @@ void __init init_apic_mappings(void)
  * This initializes the IO-APIC and APIC hardware if this is
  * a UP kernel.
  */
+int apic_version[MAX_APICS];
+
 int __init APIC_init_uniprocessor(void)
 {
         if (disable_apic) {
@@ -1409,15 +1411,26 @@ void __cpuinit generic_processor_info(int apicid, int version)
         int cpu;
         cpumask_t tmp_map;
 
+        /*
+         * Validate version
+         */
+        if (version == 0x0) {
+                printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
+                                "fixing up to 0x10. (tell your hw vendor)\n",
+                                version);
+                version = 0x10;
+        }
+        apic_version[apicid] = version;
+
         if (num_processors >= NR_CPUS) {
                 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
-                       " Processor ignored.\n", NR_CPUS);
+                        "  Processor ignored.\n", NR_CPUS);
                 return;
         }
 
         if (num_processors >= maxcpus) {
                 printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
-                       " Processor ignored.\n", maxcpus);
+                        " Processor ignored.\n", maxcpus);
                 return;
         }
 
@@ -1437,6 +1450,29 @@ void __cpuinit generic_processor_info(int apicid, int version)
         if (apicid > max_physical_apicid)
                 max_physical_apicid = apicid;
 
+#ifdef CONFIG_X86_32
+        /*
+         * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
+         * but we need to work other dependencies like SMP_SUSPEND etc
+         * before this can be done without some confusion.
+         * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
+         *       - Ashok Raj <ashok.raj@intel.com>
+         */
+        if (max_physical_apicid >= 8) {
+                switch (boot_cpu_data.x86_vendor) {
+                case X86_VENDOR_INTEL:
+                        if (!APIC_XAPIC(version)) {
+                                def_to_bigsmp = 0;
+                                break;
+                        }
+                        /* If P4 and above fall through */
+                case X86_VENDOR_AMD:
+                        def_to_bigsmp = 1;
+                }
+        }
+#endif
+
+#if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
         /* are we being called early in kernel startup? */
         if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
                 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
@@ -1448,6 +1484,7 @@ void __cpuinit generic_processor_info(int apicid, int version)
                 per_cpu(x86_cpu_to_apicid, cpu) = apicid;
                 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
         }
+#endif
 
         cpu_set(cpu, cpu_possible_map);
         cpu_set(cpu, cpu_present_map);