cpumask: use cpumask_var_t in acpi-cpufreq.c

Impact: cleanup, reduce stack usage, use new cpumask API.

Replace the cpumask_t in struct drv_cmd with a cpumask_var_t.  Remove unneeded
online_policy_cpus cpumask_t in acpi_cpufreq_target.  Update refs to use
new cpumask API.

Signed-off-by: Mike Travis <travis@sgi.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 0b31939..fb59417 100644 (file)
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -145,7 +145,7 @@ typedef union {
 
 struct drv_cmd {
        unsigned int type;
-       cpumask_t mask;
+       cpumask_var_t mask;
        drv_addr_union addr;
        u32 val;
 };
@@ -193,7 +193,7 @@ static void drv_read(struct drv_cmd *cmd)
        cpumask_t saved_mask = current->cpus_allowed;
        cmd->val = 0;
 
-       set_cpus_allowed_ptr(current, &cmd->mask);
+       set_cpus_allowed_ptr(current, cmd->mask);
        do_drv_read(cmd);
        set_cpus_allowed_ptr(current, &saved_mask);
 }
@@ -203,8 +203,8 @@ static void drv_write(struct drv_cmd *cmd)
        cpumask_t saved_mask = current->cpus_allowed;
        unsigned int i;
 
-       for_each_cpu_mask_nr(i, cmd->mask) {
-               set_cpus_allowed_ptr(current, &cpumask_of_cpu(i));
+       for_each_cpu(i, cmd->mask) {
+               set_cpus_allowed_ptr(current, cpumask_of(i));
                do_drv_write(cmd);
        }
 
@@ -212,22 +212,22 @@ static void drv_write(struct drv_cmd *cmd)
        return;
 }
 
-static u32 get_cur_val(const cpumask_t *mask)
+static u32 get_cur_val(const struct cpumask *mask)
 {
        struct acpi_processor_performance *perf;
        struct drv_cmd cmd;
 
-       if (unlikely(cpus_empty(*mask)))
+       if (unlikely(cpumask_empty(mask)))
                return 0;
 
-       switch (per_cpu(drv_data, first_cpu(*mask))->cpu_feature) {
+       switch (per_cpu(drv_data, cpumask_first(mask))->cpu_feature) {
        case SYSTEM_INTEL_MSR_CAPABLE:
                cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
                cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
                break;
        case SYSTEM_IO_CAPABLE:
                cmd.type = SYSTEM_IO_CAPABLE;
-               perf = per_cpu(drv_data, first_cpu(*mask))->acpi_data;
+               perf = per_cpu(drv_data, cpumask_first(mask))->acpi_data;
                cmd.addr.io.port = perf->control_register.address;
                cmd.addr.io.bit_width = perf->control_register.bit_width;
                break;
@@ -235,7 +235,7 @@ static u32 get_cur_val(const cpumask_t *mask)
                return 0;
        }
 
-       cmd.mask = *mask;
+       cpumask_copy(cmd.mask, mask);
 
        drv_read(&cmd);
 
@@ -386,7 +386,6 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
        struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu);
        struct acpi_processor_performance *perf;
        struct cpufreq_freqs freqs;
-       cpumask_t online_policy_cpus;
        struct drv_cmd cmd;
        unsigned int next_state = 0; /* Index into freq_table */
        unsigned int next_perf_state = 0; /* Index into perf table */
@@ -401,20 +400,18 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
                return -ENODEV;
        }
 
+       if (unlikely(!alloc_cpumask_var(&cmd.mask, GFP_KERNEL)))
+               return -ENOMEM;
+
        perf = data->acpi_data;
        result = cpufreq_frequency_table_target(policy,
                                                data->freq_table,
                                                target_freq,
                                                relation, &next_state);
-       if (unlikely(result))
-               return -ENODEV;
-
-#ifdef CONFIG_HOTPLUG_CPU
-       /* cpufreq holds the hotplug lock, so we are safe from here on */
-       cpumask_and(&online_policy_cpus, cpu_online_mask, policy->cpus);
-#else
-       online_policy_cpus = policy->cpus;
-#endif
+       if (unlikely(result)) {
+               result = -ENODEV;
+               goto out;
+       }
 
        next_perf_state = data->freq_table[next_state].index;
        if (perf->state == next_perf_state) {
@@ -425,7 +422,7 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
                } else {
                        dprintk("Already at target state (P%d)\n",
                                next_perf_state);
-                       return 0;
+                       goto out;
                }
        }
 
@@ -444,19 +441,19 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
                cmd.val = (u32) perf->states[next_perf_state].control;
                break;
        default:
-               return -ENODEV;
+               result = -ENODEV;
+               goto out;
        }
 
-       cpus_clear(cmd.mask);
-
+       /* cpufreq holds the hotplug lock, so we are safe from here on */
        if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
-               cmd.mask = online_policy_cpus;
+               cpumask_and(cmd.mask, cpu_online_mask, policy->cpus);
        else
-               cpu_set(policy->cpu, cmd.mask);
+               cpumask_copy(cmd.mask, cpumask_of(policy->cpu));
 
        freqs.old = perf->states[perf->state].core_frequency * 1000;
        freqs.new = data->freq_table[next_state].frequency;
-       for_each_cpu_mask_nr(i, cmd.mask) {
+       for_each_cpu(i, cmd.mask) {
                freqs.cpu = i;
                cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
        }
@@ -464,19 +461,22 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
        drv_write(&cmd);
 
        if (acpi_pstate_strict) {
-               if (!check_freqs(&cmd.mask, freqs.new, data)) {
+               if (!check_freqs(cmd.mask, freqs.new, data)) {
                        dprintk("acpi_cpufreq_target failed (%d)\n",
                                policy->cpu);
-                       return -EAGAIN;
+                       result = -EAGAIN;
+                       goto out;
                }
        }
 
-       for_each_cpu_mask_nr(i, cmd.mask) {
+       for_each_cpu(i, cmd.mask) {
                freqs.cpu = i;
                cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
        }
        perf->state = next_perf_state;
 
+out:
+       free_cpumask_var(cmd.mask);
        return result;
 }