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Commit e4472cb3 authored by Dave Jones's avatar Dave Jones
Browse files

[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: default avatarDave Jones <davej@redhat.com>
parent c0672860

drivers/cpufreq/cpufreq.c

+28 −19
Original line number Diff line number Diff line
@@ -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);