Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: add X86_FEATURE_XMM4_2 definitions
  x86: fix cpufreq + sched_clock() regression
  x86: fix HPET regression in 2.6.26 versus 2.6.25, check hpet against BAR, v3
  x86: do not enable TSC notifier if we don't need it
  x86 MCE: Fix CPU hotplug problem with multiple multicore AMD CPUs
  x86: fix: make PCI ECS for AMD CPUs hotplug capable
  x86: fix: do not run code in amd_bus.c on non-AMD CPUs

3 files changed, 15 insertions, 14 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c
index 65a339678ece..726a5fcdf341 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -759,6 +759,7 @@ static struct sysdev_class mce_sysclass = {
 };
 
 DEFINE_PER_CPU(struct sys_device, device_mce);
+void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu) __cpuinitdata;
 
 /* Why are there no generic functions for this? */
 #define ACCESSOR(name, var, start) \
@@ -883,9 +884,13 @@ static int __cpuinit mce_cpu_callback(struct notifier_block *nfb,
         case CPU_ONLINE:
         case CPU_ONLINE_FROZEN:
                 mce_create_device(cpu);
+                if (threshold_cpu_callback)
+                        threshold_cpu_callback(action, cpu);
                 break;
         case CPU_DEAD:
         case CPU_DEAD_FROZEN:
+                if (threshold_cpu_callback)
+                        threshold_cpu_callback(action, cpu);
                 mce_remove_device(cpu);
                 break;
         }
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
index 88736cadbaa6..5eb390a4b2e9 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c
@@ -628,6 +628,7 @@ static void threshold_remove_bank(unsigned int cpu, int bank)
         deallocate_threshold_block(cpu, bank);
 
 free_out:
+        kobject_del(b->kobj);
         kobject_put(b->kobj);
         kfree(b);
         per_cpu(threshold_banks, cpu)[bank] = NULL;
@@ -645,14 +646,11 @@ static void threshold_remove_device(unsigned int cpu)
 }
 
 /* get notified when a cpu comes on/off */
-static int __cpuinit threshold_cpu_callback(struct notifier_block *nfb,
-                                            unsigned long action, void *hcpu)
+static void __cpuinit amd_64_threshold_cpu_callback(unsigned long action,
+                                                     unsigned int cpu)
 {
-        /* cpu was unsigned int to begin with */
-        unsigned int cpu = (unsigned long)hcpu;
-
         if (cpu >= NR_CPUS)
-                goto out;
+                return;
 
         switch (action) {
         case CPU_ONLINE:
@@ -666,14 +664,8 @@ static int __cpuinit threshold_cpu_callback(struct notifier_block *nfb,
         default:
                 break;
         }
-      out:
-        return NOTIFY_OK;
 }
 
-static struct notifier_block threshold_cpu_notifier __cpuinitdata = {
-        .notifier_call = threshold_cpu_callback,
-};
-
 static __init int threshold_init_device(void)
 {
         unsigned lcpu = 0;
@@ -684,7 +676,7 @@ static __init int threshold_init_device(void)
                 if (err)
                         return err;
         }
-        register_hotcpu_notifier(&threshold_cpu_notifier);
+        threshold_cpu_callback = amd_64_threshold_cpu_callback;
         return 0;
 }
 
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 46af71676738..8e786b0d665a 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -314,7 +314,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
                         mark_tsc_unstable("cpufreq changes");
         }
 
-        set_cyc2ns_scale(tsc_khz_ref, freq->cpu);
+        set_cyc2ns_scale(tsc_khz, freq->cpu);
 
         return 0;
 }
@@ -325,6 +325,10 @@ static struct notifier_block time_cpufreq_notifier_block = {
 
 static int __init cpufreq_tsc(void)
 {
+        if (!cpu_has_tsc)
+                return 0;
+        if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
+                return 0;
         cpufreq_register_notifier(&time_cpufreq_notifier_block,
                                 CPUFREQ_TRANSITION_NOTIFIER);
         return 0;