cpumask: use cpumask_var_t in dcdbas.c

Impact: reduce stack usage.

Replace cpumask_t with cpumask_var_t in drivers/firmware/dcdbas.c.

Signed-off-by: Mike Travis <travis@sgi.com>

diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
index 777fba4..3009e01 100644 (file)
--- a/drivers/firmware/dcdbas.c
+++ b/drivers/firmware/dcdbas.c
@@ -244,7 +244,7 @@ static ssize_t host_control_on_shutdown_store(struct device *dev,
  */
 int dcdbas_smi_request(struct smi_cmd *smi_cmd)
 {
-       cpumask_t old_mask;
+       cpumask_var_t old_mask;
        int ret = 0;
 
        if (smi_cmd->magic != SMI_CMD_MAGIC) {
@@ -254,8 +254,11 @@ int dcdbas_smi_request(struct smi_cmd *smi_cmd)
        }
 
        /* SMI requires CPU 0 */
-       old_mask = current->cpus_allowed;
-       set_cpus_allowed_ptr(current, &cpumask_of_cpu(0));
+       if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
+               return -ENOMEM;
+
+       cpumask_copy(old_mask, &current->cpus_allowed);
+       set_cpus_allowed_ptr(current, cpumask_of(0));
        if (smp_processor_id() != 0) {
                dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
                        __func__);
@@ -275,7 +278,8 @@ int dcdbas_smi_request(struct smi_cmd *smi_cmd)
        );
 
 out:
-       set_cpus_allowed_ptr(current, &old_mask);
+       set_cpus_allowed_ptr(current, old_mask);
+       free_cpumask_var(old_mask);
        return ret;
 }