powernow: don't read never initialized structure member

c/s 20361:51b031b0737e removed the writing of struct
processor_performance's shared_cpu_map member, but the powernow driver
still has code to read it (though presumably that code path can't be
taken on actual hardware supported by the powernow driver). Remove the
use of the field along with the field itself.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/xen/arch/x86/acpi/cpufreq/powernow.c b/xen/arch/x86/acpi/cpufreq/powernow.c
index 846f9ca8e9..4f94d3f726 100644
--- a/xen/arch/x86/acpi/cpufreq/powernow.c
+++ b/xen/arch/x86/acpi/cpufreq/powernow.c
@@ -200,15 +200,17 @@ static int powernow_cpufreq_cpu_init(struct cpufreq_policy *policy)
     perf = data->acpi_data;
     policy->shared_type = perf->shared_type;
 
-    /*
-     * Will let policy->cpus know about dependency only when software
-     * coordination is required.
-     */
     if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
         policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
-        policy->cpus = perf->shared_cpu_map;
+        cpumask_set_cpu(cpu, &policy->cpus);
+        if (cpumask_weight(&policy->cpus) != 1) {
+            printk(XENLOG_WARNING "Unsupported sharing type %d (%u CPUs)\n",
+                   policy->shared_type, cpumask_weight(&policy->cpus));
+            result = -ENODEV;
+            goto err_unreg;
+        }
     } else {
-        policy->cpus = cpumask_of_cpu(cpu);    
+        cpumask_copy(&policy->cpus, cpumask_of(cpu));
     }
 
     /* capability check */