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[CPUFREQ] clean up speedstep-centrino and reduce cpumask_t usage 

Impact: cleanup

1) The #ifdef CONFIG_HOTPLUG_CPU seems unnecessary these days.
2) The loop can simply skip over offline cpus, rather than creating a tmp mask.
3) set_mask is set to either a single cpu or all online cpus in a policy.
   Since it's just used for set_cpus_allowed(), any offline cpus in a policy
   don't matter, so we can just use cpumask_of_cpu() or the policy->cpus.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Rusty Russell 2008-11-21 21:07:16 +10:30 committed by Dave Jones
parent bbeba4c35c
commit 9963d1aad4
1 changed files with 24 additions and 27 deletions
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51
arch/x86/kernel/cpu/cpufreq/speedstep-centrino.c
View File

@ -459,9 +459,7 @@ static int centrino_verify (struct cpufreq_policy *policy)
* Sets a new CPUFreq policy.
*/
struct allmasks {
cpumask_t online_policy_cpus;
cpumask_t saved_mask;
cpumask_t set_mask;
cpumask_t covered_cpus;
};
@ -475,9 +473,7 @@ static int centrino_target (struct cpufreq_policy *policy,
int retval = 0;
unsigned int j, k, first_cpu, tmp;
CPUMASK_ALLOC(allmasks);
CPUMASK_PTR(online_policy_cpus, allmasks);
CPUMASK_PTR(saved_mask, allmasks);
CPUMASK_PTR(set_mask, allmasks);
CPUMASK_PTR(covered_cpus, allmasks);
if (unlikely(allmasks == NULL))
@ -497,30 +493,28 @@ static int centrino_target (struct cpufreq_policy *policy,
goto out;
}
#ifdef CONFIG_HOTPLUG_CPU
/* cpufreq holds the hotplug lock, so we are safe from here on */
cpus_and(*online_policy_cpus, cpu_online_map, policy->cpus);
#else
*online_policy_cpus = policy->cpus;
#endif
*saved_mask = current->cpus_allowed;
first_cpu = 1;
cpus_clear(*covered_cpus);
for_each_cpu_mask_nr(j, *online_policy_cpus) {
for_each_cpu_mask_nr(j, policy->cpus) {
const cpumask_t *mask;
/* cpufreq holds the hotplug lock, so we are safe here */
if (!cpu_online(j))
continue;
/*
* Support for SMP systems.
* Make sure we are running on CPU that wants to change freq
*/
cpus_clear(*set_mask);
if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
cpus_or(*set_mask, *set_mask, *online_policy_cpus);
mask = &policy->cpus;
else
cpu_set(j, *set_mask);
mask = &cpumask_of_cpu(j);
set_cpus_allowed_ptr(current, set_mask);
set_cpus_allowed_ptr(current, mask);
preempt_disable();
if (unlikely(!cpu_isset(smp_processor_id(), *set_mask))) {
if (unlikely(!cpu_isset(smp_processor_id(), *mask))) {
dprintk("couldn't limit to CPUs in this domain\n");
retval = -EAGAIN;
if (first_cpu) {
@ -548,7 +542,9 @@ static int centrino_target (struct cpufreq_policy *policy,
dprintk("target=%dkHz old=%d new=%d msr=%04x\n",
target_freq, freqs.old, freqs.new, msr);
for_each_cpu_mask_nr(k, *online_policy_cpus) {
for_each_cpu_mask_nr(k, policy->cpus) {
if (!cpu_online(k))
continue;
freqs.cpu = k;
cpufreq_notify_transition(&freqs,
CPUFREQ_PRECHANGE);
@ -571,7 +567,9 @@ static int centrino_target (struct cpufreq_policy *policy,
preempt_enable();
}
for_each_cpu_mask_nr(k, *online_policy_cpus) {
for_each_cpu_mask_nr(k, policy->cpus) {
if (!cpu_online(k))
continue;
freqs.cpu = k;
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}
@ -584,18 +582,17 @@ static int centrino_target (struct cpufreq_policy *policy,
* Best effort undo..
*/
if (!cpus_empty(*covered_cpus))
for_each_cpu_mask_nr(j, *covered_cpus) {
set_cpus_allowed_ptr(current,
&cpumask_of_cpu(j));
wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
}
for_each_cpu_mask_nr(j, *covered_cpus) {
set_cpus_allowed_ptr(current, &cpumask_of_cpu(j));
wrmsr(MSR_IA32_PERF_CTL, oldmsr, h);
}
tmp = freqs.new;
freqs.new = freqs.old;
freqs.old = tmp;
for_each_cpu_mask_nr(j, *online_policy_cpus) {
freqs.cpu = j;
for_each_cpu_mask_nr(j, policy->cpus) {
if (!cpu_online(j))
continue;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
}