1 files changed, 13 insertions, 5 deletions

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 8144aa3a1edf..147af81f70ea 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -711,10 +711,6 @@ static int __cpuinit __smp_prepare_cpu(int cpu)
         int     apicid, ret;
 
         apicid = per_cpu(x86_cpu_to_apicid, cpu);
-        if (apicid == BAD_APICID) {
-                ret = -ENODEV;
-                goto exit;
-        }
 
         info.complete = &done;
         info.apicid = apicid;
@@ -952,10 +948,22 @@ void __init native_smp_prepare_boot_cpu(void)
 
 int __cpuinit native_cpu_up(unsigned int cpu)
 {
+        int apicid = cpu_present_to_apicid(cpu);
         unsigned long flags;
-#ifdef CONFIG_HOTPLUG_CPU
         int ret = 0;
 
+        WARN_ON(irqs_disabled());
+
+        Dprintk("++++++++++++++++++++=_---CPU UP  %u\n", cpu);
+
+        if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
+            !physid_isset(apicid, phys_cpu_present_map)) {
+                printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
+                return -EINVAL;
+        }
+
+#ifdef CONFIG_HOTPLUG_CPU
+
         /*
          * We do warm boot only on cpus that had booted earlier
          * Otherwise cold boot is all handled from smp_boot_cpus().