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
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -145,7 +145,7 @@
struct drv_cmd {
unsigned int type;
- cpumask_t mask;
+ cpumask_var_t mask;
drv_addr_union addr;
u32 val;
};
@@ -193,7 +193,7 @@
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 @@
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 @@
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 @@
return 0;
}
- cmd.mask = *mask;
+ cpumask_copy(cmd.mask, mask);
drv_read(&cmd);
@@ -386,7 +386,6 @@
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 @@
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 @@
} else {
dprintk("Already at target state (P%d)\n",
next_perf_state);
- return 0;
+ goto out;
}
}
@@ -444,19 +441,19 @@
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 @@
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;
}