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[S390] idle: remove idle notifier chain.

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The idle notifier chain consists of at most one element. So there's
no point in having a notifier chain. Remove it and directly call the
function.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2008-07-14 09:59:06 +02:00
parent 9d92a7e1b0
commit 773922e1da
4 changed files with 16 additions and 63 deletions
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32
arch/s390/kernel/process.c
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@@ -75,46 +75,19 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sf->gprs[8];
}
/*
* Need to know about CPUs going idle?
*/
static ATOMIC_NOTIFIER_HEAD(idle_chain);
DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
int register_idle_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&idle_chain, nb);
}
EXPORT_SYMBOL(register_idle_notifier);
int unregister_idle_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&idle_chain, nb);
}
EXPORT_SYMBOL(unregister_idle_notifier);
static int s390_idle_enter(void)
{
struct s390_idle_data *idle;
int nr_calls = 0;
void *hcpu;
int rc;
hcpu = (void *)(long)smp_processor_id();
rc = __atomic_notifier_call_chain(&idle_chain, S390_CPU_IDLE, hcpu, -1,
&nr_calls);
if (rc == NOTIFY_BAD) {
nr_calls--;
__atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
hcpu, nr_calls, NULL);
return rc;
}
idle = &__get_cpu_var(s390_idle);
spin_lock(&idle->lock);
idle->idle_count++;
idle->in_idle = 1;
idle->idle_enter = get_clock();
spin_unlock(&idle->lock);
vtime_stop_cpu_timer();
return NOTIFY_OK;
}
@@ -122,13 +95,12 @@ void s390_idle_leave(void)
{
struct s390_idle_data *idle;
vtime_start_cpu_timer();
idle = &__get_cpu_var(s390_idle);
spin_lock(&idle->lock);
idle->idle_time += get_clock() - idle->idle_enter;
idle->in_idle = 0;
spin_unlock(&idle->lock);
atomic_notifier_call_chain(&idle_chain, S390_CPU_NOT_IDLE,
(void *)(long) smp_processor_id());
}
extern void s390_handle_mcck(void);