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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
View file

@ -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);

25
arch/s390/kernel/vtime.c
View file

@ -136,7 +136,7 @@ static inline void set_vtimer(__u64 expires)
}
#endif
static void start_cpu_timer(void)
void vtime_start_cpu_timer(void)
{
struct vtimer_queue *vt_list;
@ -150,7 +150,7 @@ static void start_cpu_timer(void)
set_vtimer(vt_list->idle);
}
static void stop_cpu_timer(void)
void vtime_stop_cpu_timer(void)
{
struct vtimer_queue *vt_list;
@ -536,24 +536,6 @@ void init_cpu_vtimer(void)
}
static int vtimer_idle_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
switch (action) {
case S390_CPU_IDLE:
stop_cpu_timer();
break;
case S390_CPU_NOT_IDLE:
start_cpu_timer();
break;
}
return NOTIFY_OK;
}
static struct notifier_block vtimer_idle_nb = {
.notifier_call = vtimer_idle_notify,
};
void __init vtime_init(void)
{
/* request the cpu timer external interrupt */
@ -561,9 +543,6 @@ void __init vtime_init(void)
&ext_int_info_timer) != 0)
panic("Couldn't request external interrupt 0x1005");
if (register_idle_notifier(&vtimer_idle_nb))
panic("Couldn't register idle notifier");
/* Enable cpu timer interrupts on the boot cpu. */
init_cpu_vtimer();
}

10
include/asm-s390/processor.h
View file

@ -336,16 +336,6 @@ extern void (*s390_base_mcck_handler_fn)(void);
extern void (*s390_base_pgm_handler_fn)(void);
extern void (*s390_base_ext_handler_fn)(void);
/*
* CPU idle notifier chain.
*/
#define S390_CPU_IDLE 0
#define S390_CPU_NOT_IDLE 1
struct notifier_block;
int register_idle_notifier(struct notifier_block *nb);
int unregister_idle_notifier(struct notifier_block *nb);
#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
#endif

12
include/asm-s390/timer.h
View file

@ -48,6 +48,18 @@ extern int del_virt_timer(struct vtimer_list *timer);
extern void init_cpu_vtimer(void);
extern void vtime_init(void);
#ifdef CONFIG_VIRT_TIMER
extern void vtime_start_cpu_timer(void);
extern void vtime_stop_cpu_timer(void);
#else
static inline void vtime_start_cpu_timer(void) { }
static inline void vtime_stop_cpu_timer(void) { }
#endif /* CONFIG_VIRT_TIMER */
#endif /* __KERNEL__ */
#endif /* _ASM_S390_TIMER_H */