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[CPUFREQ] cpufreq_notify_transition cleanup. 

Introduce caching of cpufreq_cpu_data[freqs->cpu], which allows us to
make the function a lot more readable, and as a nice side-effect, it
now fits in < 80 column displays again.

Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones 2006-01-31 15:53:55 -08:00
Родитель c067286019
Коммит e4472cb370
1 изменённых файлов: 28 добавлений и 19 удалений
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47
drivers/cpufreq/cpufreq.c
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@ -229,44 +229,53 @@ static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) {
/**
* cpufreq_notify_transition - call notifier chain and adjust_jiffies on frequency transition
* cpufreq_notify_transition - call notifier chain and adjust_jiffies
* on frequency transition.
*
* This function calls the transition notifiers and the "adjust_jiffies" function. It is called
* twice on all CPU frequency changes that have external effects.
* This function calls the transition notifiers and the "adjust_jiffies"
* function. It is called twice on all CPU frequency changes that have
* external effects.
*/
void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
{
struct cpufreq_policy *policy;
BUG_ON(irqs_disabled());
freqs->flags = cpufreq_driver->flags;
dprintk("notification %u of frequency transition to %u kHz\n", state, freqs->new);
dprintk("notification %u of frequency transition to %u kHz\n",
state, freqs->new);
down_read(&cpufreq_notifier_rwsem);
policy = cpufreq_cpu_data[freqs->cpu];
switch (state) {
case CPUFREQ_PRECHANGE:
/* detect if the driver reported a value as "old frequency" which
* is not equal to what the cpufreq core thinks is "old frequency".
/* detect if the driver reported a value as "old frequency"
* which is not equal to what the cpufreq core thinks is
* "old frequency".
*/
if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
(likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)) &&
(likely(cpufreq_cpu_data[freqs->cpu]->cur)) &&
(unlikely(freqs->old != cpufreq_cpu_data[freqs->cpu]->cur)))
{
dprintk(KERN_WARNING "Warning: CPU frequency is %u, "
"cpufreq assumed %u kHz.\n", freqs->old, cpufreq_cpu_data[freqs->cpu]->cur);
freqs->old = cpufreq_cpu_data[freqs->cpu]->cur;
if ((policy) && (policy->cpu == freqs->cpu) &&
(policy->cur) && (policy->cur != freqs->old)) {
dprintk(KERN_WARNING "Warning: CPU frequency is"
" %u, cpufreq assumed %u kHz.\n",
freqs->old, policy->cur);
freqs->old = policy->cur;
}
}
notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_PRECHANGE, freqs);
notifier_call_chain(&cpufreq_transition_notifier_list,
CPUFREQ_PRECHANGE, freqs);
adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
break;
case CPUFREQ_POSTCHANGE:
adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
notifier_call_chain(&cpufreq_transition_notifier_list, CPUFREQ_POSTCHANGE, freqs);
if ((likely(cpufreq_cpu_data[freqs->cpu])) &&
(likely(cpufreq_cpu_data[freqs->cpu]->cpu == freqs->cpu)))
cpufreq_cpu_data[freqs->cpu]->cur = freqs->new;
notifier_call_chain(&cpufreq_transition_notifier_list,
CPUFREQ_POSTCHANGE, freqs);
if (likely(policy) && likely(policy->cpu == freqs->cpu))
policy->cur = freqs->new;
break;
}
up_read(&cpufreq_notifier_rwsem);