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[ARM] dyntick: Remove obsolete and unused ARM dyntick support

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dyntick is superseded by the clocksource/clockevent infrastructure,
using the NO_HZ configuration option.  No one implements dyntick on
ARM anymore, so it's pointless keeping it around.  Remove dyntick
support.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2008-04-20 13:57:26 +01:00
committed by Russell King
parent 492c2e476e
commit 205bee6ad8
46 changed files with 1 additions and 235 deletions
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4
arch/arm/kernel/process.c
View File

@ -133,10 +133,8 @@ static void default_idle(void)
cpu_relax();
else {
local_irq_disable();
if (!need_resched()) {
timer_dyn_reprogram();
if (!need_resched())
arch_idle();
}
local_irq_enable();
}
}

120
arch/arm/kernel/time.c
View File

@ -365,108 +365,6 @@ static struct sysdev_class timer_sysclass = {
.resume = timer_resume,
};
#ifdef CONFIG_NO_IDLE_HZ
static int timer_dyn_tick_enable(void)
{
struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
unsigned long flags;
int ret = -ENODEV;
if (dyn_tick) {
spin_lock_irqsave(&dyn_tick->lock, flags);
ret = 0;
if (!(dyn_tick->state & DYN_TICK_ENABLED)) {
ret = dyn_tick->enable();
if (ret == 0)
dyn_tick->state |= DYN_TICK_ENABLED;
}
spin_unlock_irqrestore(&dyn_tick->lock, flags);
}
return ret;
}
static int timer_dyn_tick_disable(void)
{
struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
unsigned long flags;
int ret = -ENODEV;
if (dyn_tick) {
spin_lock_irqsave(&dyn_tick->lock, flags);
ret = 0;
if (dyn_tick->state & DYN_TICK_ENABLED) {
ret = dyn_tick->disable();
if (ret == 0)
dyn_tick->state &= ~DYN_TICK_ENABLED;
}
spin_unlock_irqrestore(&dyn_tick->lock, flags);
}
return ret;
}
/*
* Reprogram the system timer for at least the calculated time interval.
* This function should be called from the idle thread with IRQs disabled,
* immediately before sleeping.
*/
void timer_dyn_reprogram(void)
{
struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
unsigned long next, seq, flags;
if (!dyn_tick)
return;
spin_lock_irqsave(&dyn_tick->lock, flags);
if (dyn_tick->state & DYN_TICK_ENABLED) {
next = next_timer_interrupt();
do {
seq = read_seqbegin(&xtime_lock);
dyn_tick->reprogram(next - jiffies);
} while (read_seqretry(&xtime_lock, seq));
}
spin_unlock_irqrestore(&dyn_tick->lock, flags);
}
static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)
{
return sprintf(buf, "%i\n",
(system_timer->dyn_tick->state & DYN_TICK_ENABLED) >> 1);
}
static ssize_t timer_set_dyn_tick(struct sys_device *dev, const char *buf,
size_t count)
{
unsigned int enable = simple_strtoul(buf, NULL, 2);
if (enable)
timer_dyn_tick_enable();
else
timer_dyn_tick_disable();
return count;
}
static SYSDEV_ATTR(dyn_tick, 0644, timer_show_dyn_tick, timer_set_dyn_tick);
/*
* dyntick=enable|disable
*/
static char dyntick_str[4] __initdata = "";
static int __init dyntick_setup(char *str)
{
if (str)
strlcpy(dyntick_str, str, sizeof(dyntick_str));
return 1;
}
__setup("dyntick=", dyntick_setup);
#endif
static int __init timer_init_sysfs(void)
{
int ret = sysdev_class_register(&timer_sysclass);
@ -475,19 +373,6 @@ static int __init timer_init_sysfs(void)
ret = sysdev_register(&system_timer->dev);
}
#ifdef CONFIG_NO_IDLE_HZ
if (ret == 0 && system_timer->dyn_tick) {
ret = sysdev_create_file(&system_timer->dev, &attr_dyn_tick);
/*
* Turn on dynamic tick after calibrate delay
* for correct bogomips
*/
if (ret == 0 && dyntick_str[0] == 'e')
ret = timer_dyn_tick_enable();
}
#endif
return ret;
}
@ -500,10 +385,5 @@ void __init time_init(void)
system_timer->offset = dummy_gettimeoffset;
#endif
system_timer->init();
#ifdef CONFIG_NO_IDLE_HZ
if (system_timer->dyn_tick)
spin_lock_init(&system_timer->dyn_tick->lock);
#endif
}