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cpumask: convert kernel time functions 

Impact: Use new APIs

Convert kernel/time functions to use struct cpumask *.

Note the ugly bitmap declarations in tick-broadcast.c.  These should
be cpumask_var_t, but there was no obvious initialization function to
put the alloc_cpumask_var() calls in.  This was safe.

(Eventually 'struct cpumask' will be undefined for CONFIG_CPUMASK_OFFSTACK,
so we use a bitmap here to show we really mean it).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
This commit is contained in:
Rusty Russell 2009-01-01 10:12:25 +10:30
parent e7577c50f2
commit 6b954823c2
4 changed files with 65 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/tick.h
View File

@ -84,10 +84,10 @@ static inline void tick_cancel_sched_timer(int cpu) { }
# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
extern struct tick_device *tick_get_broadcast_device(void);
extern cpumask_t *tick_get_broadcast_mask(void);
extern struct cpumask *tick_get_broadcast_mask(void);
# ifdef CONFIG_TICK_ONESHOT
extern cpumask_t *tick_get_broadcast_oneshot_mask(void);
extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
# endif
# endif /* BROADCAST */

6
kernel/time/clocksource.c
View File

@ -148,7 +148,7 @@ static void clocksource_watchdog(unsigned long data)
int next_cpu = next_cpu_nr(raw_smp_processor_id(), cpu_online_map);
if (next_cpu >= nr_cpu_ids)
next_cpu = first_cpu(cpu_online_map);
next_cpu = cpumask_first(cpu_online_mask);
watchdog_timer.expires += WATCHDOG_INTERVAL;
add_timer_on(&watchdog_timer, next_cpu);
}
@ -173,7 +173,7 @@ static void clocksource_check_watchdog(struct clocksource *cs)
watchdog_last = watchdog->read();
watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL;
add_timer_on(&watchdog_timer,
first_cpu(cpu_online_map));
cpumask_first(cpu_online_mask));
}
} else {
if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
@ -195,7 +195,7 @@ static void clocksource_check_watchdog(struct clocksource *cs)
watchdog_timer.expires =
jiffies + WATCHDOG_INTERVAL;
add_timer_on(&watchdog_timer,
first_cpu(cpu_online_map));
cpumask_first(cpu_online_mask));
}
}
}

111
kernel/time/tick-broadcast.c
View File

@ -28,7 +28,9 @@
*/
struct tick_device tick_broadcast_device;
static cpumask_t tick_broadcast_mask;
/* FIXME: Use cpumask_var_t. */
static DECLARE_BITMAP(tick_broadcast_mask, NR_CPUS);
static DECLARE_BITMAP(tmpmask, NR_CPUS);
static DEFINE_SPINLOCK(tick_broadcast_lock);
static int tick_broadcast_force;
@ -46,9 +48,9 @@ struct tick_device *tick_get_broadcast_device(void)
return &tick_broadcast_device;
}
cpumask_t *tick_get_broadcast_mask(void)
struct cpumask *tick_get_broadcast_mask(void)
{
return &tick_broadcast_mask;
return to_cpumask(tick_broadcast_mask);
}
/*
@ -72,7 +74,7 @@ int tick_check_broadcast_device(struct clock_event_device *dev)
clockevents_exchange_device(NULL, dev);
tick_broadcast_device.evtdev = dev;
if (!cpus_empty(tick_broadcast_mask))
if (!cpumask_empty(tick_get_broadcast_mask()))
tick_broadcast_start_periodic(dev);
return 1;
}
@ -104,7 +106,7 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
*/
if (!tick_device_is_functional(dev)) {
dev->event_handler = tick_handle_periodic;
cpu_set(cpu, tick_broadcast_mask);
cpumask_set_cpu(cpu, tick_get_broadcast_mask());
tick_broadcast_start_periodic(tick_broadcast_device.evtdev);
ret = 1;
} else {
@ -116,7 +118,7 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
if (!(dev->features & CLOCK_EVT_FEAT_C3STOP)) {
int cpu = smp_processor_id();
cpu_clear(cpu, tick_broadcast_mask);
cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
tick_broadcast_clear_oneshot(cpu);
}
}
@ -125,9 +127,9 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
}
/*
* Broadcast the event to the cpus, which are set in the mask
* Broadcast the event to the cpus, which are set in the mask (mangled).
*/
static void tick_do_broadcast(cpumask_t mask)
static void tick_do_broadcast(struct cpumask *mask)
{
int cpu = smp_processor_id();
struct tick_device *td;
@ -135,22 +137,21 @@ static void tick_do_broadcast(cpumask_t mask)
/*
* Check, if the current cpu is in the mask
*/
if (cpu_isset(cpu, mask)) {
cpu_clear(cpu, mask);
if (cpumask_test_cpu(cpu, mask)) {
cpumask_clear_cpu(cpu, mask);
td = &per_cpu(tick_cpu_device, cpu);
td->evtdev->event_handler(td->evtdev);
}
if (!cpus_empty(mask)) {
if (!cpumask_empty(mask)) {
/*
* It might be necessary to actually check whether the devices
* have different broadcast functions. For now, just use the
* one of the first device. This works as long as we have this
* misfeature only on x86 (lapic)
*/
cpu = first_cpu(mask);
td = &per_cpu(tick_cpu_device, cpu);
td->evtdev->broadcast(&mask);
td = &per_cpu(tick_cpu_device, cpumask_first(mask));
td->evtdev->broadcast(mask);
}
}
@ -160,12 +161,11 @@ static void tick_do_broadcast(cpumask_t mask)
*/
static void tick_do_periodic_broadcast(void)
{
cpumask_t mask;
spin_lock(&tick_broadcast_lock);
cpus_and(mask, cpu_online_map, tick_broadcast_mask);
tick_do_broadcast(mask);
cpumask_and(to_cpumask(tmpmask),
cpu_online_mask, tick_get_broadcast_mask());
tick_do_broadcast(to_cpumask(tmpmask));
spin_unlock(&tick_broadcast_lock);
}
@ -228,13 +228,13 @@ static void tick_do_broadcast_on_off(void *why)
if (!tick_device_is_functional(dev))
goto out;
bc_stopped = cpus_empty(tick_broadcast_mask);
bc_stopped = cpumask_empty(tick_get_broadcast_mask());
switch (*reason) {
case CLOCK_EVT_NOTIFY_BROADCAST_ON:
case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:
if (!cpu_isset(cpu, tick_broadcast_mask)) {
cpu_set(cpu, tick_broadcast_mask);
if (!cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {
cpumask_set_cpu(cpu, tick_get_broadcast_mask());
if (tick_broadcast_device.mode ==
TICKDEV_MODE_PERIODIC)
clockevents_shutdown(dev);
@ -244,8 +244,8 @@ static void tick_do_broadcast_on_off(void *why)
break;
case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
if (!tick_broadcast_force &&
cpu_isset(cpu, tick_broadcast_mask)) {
cpu_clear(cpu, tick_broadcast_mask);
cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {
cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
if (tick_broadcast_device.mode ==
TICKDEV_MODE_PERIODIC)
tick_setup_periodic(dev, 0);
@ -253,7 +253,7 @@ static void tick_do_broadcast_on_off(void *why)
break;
}
if (cpus_empty(tick_broadcast_mask)) {
if (cpumask_empty(tick_get_broadcast_mask())) {
if (!bc_stopped)
clockevents_shutdown(bc);
} else if (bc_stopped) {
@ -272,7 +272,7 @@ out:
*/
void tick_broadcast_on_off(unsigned long reason, int *oncpu)
{
if (!cpu_isset(*oncpu, cpu_online_map))
if (!cpumask_test_cpu(*oncpu, cpu_online_mask))
printk(KERN_ERR "tick-broadcast: ignoring broadcast for "
"offline CPU #%d\n", *oncpu);
else
@ -303,10 +303,10 @@ void tick_shutdown_broadcast(unsigned int *cpup)
spin_lock_irqsave(&tick_broadcast_lock, flags);
bc = tick_broadcast_device.evtdev;
cpu_clear(cpu, tick_broadcast_mask);
cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
if (bc && cpus_empty(tick_broadcast_mask))
if (bc && cpumask_empty(tick_get_broadcast_mask()))
clockevents_shutdown(bc);
}
@ -342,10 +342,10 @@ int tick_resume_broadcast(void)
switch (tick_broadcast_device.mode) {
case TICKDEV_MODE_PERIODIC:
if(!cpus_empty(tick_broadcast_mask))
if (!cpumask_empty(tick_get_broadcast_mask()))
tick_broadcast_start_periodic(bc);
broadcast = cpu_isset(smp_processor_id(),
tick_broadcast_mask);
broadcast = cpumask_test_cpu(smp_processor_id(),
tick_get_broadcast_mask());
break;
case TICKDEV_MODE_ONESHOT:
broadcast = tick_resume_broadcast_oneshot(bc);
@ -360,14 +360,15 @@ int tick_resume_broadcast(void)
#ifdef CONFIG_TICK_ONESHOT
static cpumask_t tick_broadcast_oneshot_mask;
/* FIXME: use cpumask_var_t. */
static DECLARE_BITMAP(tick_broadcast_oneshot_mask, NR_CPUS);
/*
* Debugging: see timer_list.c
* Exposed for debugging: see timer_list.c
*/
cpumask_t *tick_get_broadcast_oneshot_mask(void)
struct cpumask *tick_get_broadcast_oneshot_mask(void)
{
return &tick_broadcast_oneshot_mask;
return to_cpumask(tick_broadcast_oneshot_mask);
}
static int tick_broadcast_set_event(ktime_t expires, int force)
@ -389,7 +390,7 @@ int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
*/
void tick_check_oneshot_broadcast(int cpu)
{
if (cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
if (cpumask_test_cpu(cpu, to_cpumask(tick_broadcast_oneshot_mask))) {
struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
@ -402,7 +403,6 @@ void tick_check_oneshot_broadcast(int cpu)
static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
{
struct tick_device *td;
cpumask_t mask;
ktime_t now, next_event;
int cpu;
@ -410,13 +410,13 @@ static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
again:
dev->next_event.tv64 = KTIME_MAX;
next_event.tv64 = KTIME_MAX;
mask = CPU_MASK_NONE;
cpumask_clear(to_cpumask(tmpmask));
now = ktime_get();
/* Find all expired events */
for_each_cpu_mask_nr(cpu, tick_broadcast_oneshot_mask) {
for_each_cpu(cpu, tick_get_broadcast_oneshot_mask()) {
td = &per_cpu(tick_cpu_device, cpu);
if (td->evtdev->next_event.tv64 <= now.tv64)
cpu_set(cpu, mask);
cpumask_set_cpu(cpu, to_cpumask(tmpmask));
else if (td->evtdev->next_event.tv64 < next_event.tv64)
next_event.tv64 = td->evtdev->next_event.tv64;
}
@ -424,7 +424,7 @@ again:
/*
* Wakeup the cpus which have an expired event.
*/
tick_do_broadcast(mask);
tick_do_broadcast(to_cpumask(tmpmask));
/*
* Two reasons for reprogram:
@ -476,15 +476,16 @@ void tick_broadcast_oneshot_control(unsigned long reason)
goto out;
if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {
if (!cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
cpu_set(cpu, tick_broadcast_oneshot_mask);
if (!cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {
cpumask_set_cpu(cpu, tick_get_broadcast_oneshot_mask());
clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
if (dev->next_event.tv64 < bc->next_event.tv64)
tick_broadcast_set_event(dev->next_event, 1);
}
} else {
if (cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
cpu_clear(cpu, tick_broadcast_oneshot_mask);
if (cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {
cpumask_clear_cpu(cpu,
tick_get_broadcast_oneshot_mask());
clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
if (dev->next_event.tv64 != KTIME_MAX)
tick_program_event(dev->next_event, 1);
@ -502,10 +503,11 @@ out:
*/
static void tick_broadcast_clear_oneshot(int cpu)
{
cpu_clear(cpu, tick_broadcast_oneshot_mask);
cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());
}
static void tick_broadcast_init_next_event(cpumask_t *mask, ktime_t expires)
static void tick_broadcast_init_next_event(struct cpumask *mask,
ktime_t expires)
{
struct tick_device *td;
int cpu;
@ -526,7 +528,6 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
if (bc->event_handler != tick_handle_oneshot_broadcast) {
int was_periodic = bc->mode == CLOCK_EVT_MODE_PERIODIC;
int cpu = smp_processor_id();
cpumask_t mask;
bc->event_handler = tick_handle_oneshot_broadcast;
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
@ -540,13 +541,15 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
* oneshot_mask bits for those and program the
* broadcast device to fire.
*/
mask = tick_broadcast_mask;
cpu_clear(cpu, mask);
cpus_or(tick_broadcast_oneshot_mask,
tick_broadcast_oneshot_mask, mask);
cpumask_copy(to_cpumask(tmpmask), tick_get_broadcast_mask());
cpumask_clear_cpu(cpu, to_cpumask(tmpmask));
cpumask_or(tick_get_broadcast_oneshot_mask(),
tick_get_broadcast_oneshot_mask(),
to_cpumask(tmpmask));
if (was_periodic && !cpus_empty(mask)) {
tick_broadcast_init_next_event(&mask, tick_next_period);
if (was_periodic && !cpumask_empty(to_cpumask(tmpmask))) {
tick_broadcast_init_next_event(to_cpumask(tmpmask),
tick_next_period);
tick_broadcast_set_event(tick_next_period, 1);
} else
bc->next_event.tv64 = KTIME_MAX;
@ -585,7 +588,7 @@ void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
* Clear the broadcast mask flag for the dead cpu, but do not
* stop the broadcast device!
*/
cpu_clear(cpu, tick_broadcast_oneshot_mask);
cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}

6
kernel/time/tick-common.c
View File

@ -254,7 +254,7 @@ static int tick_check_new_device(struct clock_event_device *newdev)
curdev = NULL;
}
clockevents_exchange_device(curdev, newdev);
tick_setup_device(td, newdev, cpu, &cpumask_of_cpu(cpu));
tick_setup_device(td, newdev, cpu, cpumask_of(cpu));
if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)
tick_oneshot_notify();
@ -299,9 +299,9 @@ static void tick_shutdown(unsigned int *cpup)
}
/* Transfer the do_timer job away from this cpu */
if (*cpup == tick_do_timer_cpu) {
int cpu = first_cpu(cpu_online_map);
int cpu = cpumask_first(cpu_online_mask);
tick_do_timer_cpu = (cpu != NR_CPUS) ? cpu :
tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
TICK_DO_TIMER_NONE;
}
spin_unlock_irqrestore(&tick_device_lock, flags);