cxgb4: Signedness bug in init_one()

[linux.git] / drivers / acpi / pptt.c

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 1e7ac0bd0d3a090c42136e2b4fc213a31924516c..f31544d3656e3dfb400ce86d51ea46679eafde3b 100644 (file)
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -540,6 +540,44 @@ static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
        return retval;
 }
 
+/**
+ * check_acpi_cpu_flag() - Determine if CPU node has a flag set
+ * @cpu: Kernel logical CPU number
+ * @rev: The minimum PPTT revision defining the flag
+ * @flag: The flag itself
+ *
+ * Check the node representing a CPU for a given flag.
+ *
+ * Return: -ENOENT if the PPTT doesn't exist, the CPU cannot be found or
+ *        the table revision isn't new enough.
+ *        1, any passed flag set
+ *        0, flag unset
+ */
+static int check_acpi_cpu_flag(unsigned int cpu, int rev, u32 flag)
+{
+       struct acpi_table_header *table;
+       acpi_status status;
+       u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+       struct acpi_pptt_processor *cpu_node = NULL;
+       int ret = -ENOENT;
+
+       status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
+       if (ACPI_FAILURE(status)) {
+               acpi_pptt_warn_missing();
+               return ret;
+       }
+
+       if (table->revision >= rev)
+               cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+
+       if (cpu_node)
+               ret = (cpu_node->flags & flag) != 0;
+
+       acpi_put_table(table);
+
+       return ret;
+}
+
 /**
  * acpi_find_last_cache_level() - Determines the number of cache levels for a PE
  * @cpu: Kernel logical CPU number
@@ -604,6 +642,20 @@ int cache_setup_acpi(unsigned int cpu)
        return status;
 }
 
+/**
+ * acpi_pptt_cpu_is_thread() - Determine if CPU is a thread
+ * @cpu: Kernel logical CPU number
+ *
+ * Return: 1, a thread
+ *         0, not a thread
+ *         -ENOENT ,if the PPTT doesn't exist, the CPU cannot be found or
+ *         the table revision isn't new enough.
+ */
+int acpi_pptt_cpu_is_thread(unsigned int cpu)
+{
+       return check_acpi_cpu_flag(cpu, 2, ACPI_PPTT_ACPI_PROCESSOR_IS_THREAD);
+}
+
 /**
  * find_acpi_cpu_topology() - Determine a unique topology value for a given CPU
  * @cpu: Kernel logical CPU number
@@ -664,7 +716,6 @@ int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
        return ret;
 }
 
-
 /**
  * find_acpi_cpu_topology_package() - Determine a unique CPU package value
  * @cpu: Kernel logical CPU number