Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / cpu / cpufreq / acpi-cpufreq.c

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 43eb3465dda73bb7314ca3c45f2f007c7e4d28cf..f28decf8dde3990626f493e5d962bfea9d48e59f 100644 (file)
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -526,15 +526,21 @@ static const struct dmi_system_id sw_any_bug_dmi_table[] = {
 
 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
 {
-       /* http://www.intel.com/Assets/PDF/specupdate/314554.pdf
+       /* Intel Xeon Processor 7100 Series Specification Update
+        * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
         * AL30: A Machine Check Exception (MCE) Occurring during an
         * Enhanced Intel SpeedStep Technology Ratio Change May Cause
-        * Both Processor Cores to Lock Up when HT is enabled*/
+        * Both Processor Cores to Lock Up. */
        if (c->x86_vendor == X86_VENDOR_INTEL) {
                if ((c->x86 == 15) &&
                    (c->x86_model == 6) &&
-                   (c->x86_mask == 8) && smt_capable())
+                   (c->x86_mask == 8)) {
+                       printk(KERN_INFO "acpi-cpufreq: Intel(R) "
+                           "Xeon(R) 7100 Errata AL30, processors may "
+                           "lock up on frequency changes: disabling "
+                           "acpi-cpufreq.\n");
                        return -ENODEV;
+                   }
                }
        return 0;
 }
@@ -549,13 +555,18 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
        unsigned int result = 0;
        struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
        struct acpi_processor_performance *perf;
+#ifdef CONFIG_SMP
+       static int blacklisted;
+#endif
 
        dprintk("acpi_cpufreq_cpu_init\n");
 
 #ifdef CONFIG_SMP
-       result = acpi_cpufreq_blacklist(c);
-       if (result)
-               return result;
+       if (blacklisted)
+               return blacklisted;
+       blacklisted = acpi_cpufreq_blacklist(c);
+       if (blacklisted)
+               return blacklisted;
 #endif
 
        data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
@@ -753,14 +764,15 @@ static struct freq_attr *acpi_cpufreq_attr[] = {
 };
 
 static struct cpufreq_driver acpi_cpufreq_driver = {
-       .verify = acpi_cpufreq_verify,
-       .target = acpi_cpufreq_target,
-       .init = acpi_cpufreq_cpu_init,
-       .exit = acpi_cpufreq_cpu_exit,
-       .resume = acpi_cpufreq_resume,
-       .name = "acpi-cpufreq",
-       .owner = THIS_MODULE,
-       .attr = acpi_cpufreq_attr,
+       .verify         = acpi_cpufreq_verify,
+       .target         = acpi_cpufreq_target,
+       .bios_limit     = acpi_processor_get_bios_limit,
+       .init           = acpi_cpufreq_cpu_init,
+       .exit           = acpi_cpufreq_cpu_exit,
+       .resume         = acpi_cpufreq_resume,
+       .name           = "acpi-cpufreq",
+       .owner          = THIS_MODULE,
+       .attr           = acpi_cpufreq_attr,
 };
 
 static int __init acpi_cpufreq_init(void)