Commit 902f2ac9 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'timers-fixes-for-linus' of...

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  clockevents: make device shutdown robust
  clocksource, acpi_pm.c: fix check for monotonicity
  clockevents: remove WARN_ON which was used to gather information
parents 06d4a22b 2344abbc
...@@ -178,11 +178,13 @@ static int verify_pmtmr_rate(void) ...@@ -178,11 +178,13 @@ static int verify_pmtmr_rate(void)
/* Number of monotonicity checks to perform during initialization */ /* Number of monotonicity checks to perform during initialization */
#define ACPI_PM_MONOTONICITY_CHECKS 10 #define ACPI_PM_MONOTONICITY_CHECKS 10
/* Number of reads we try to get two different values */
#define ACPI_PM_READ_CHECKS 10000
static int __init init_acpi_pm_clocksource(void) static int __init init_acpi_pm_clocksource(void)
{ {
cycle_t value1, value2; cycle_t value1, value2;
unsigned int i, j, good = 0; unsigned int i, j = 0;
if (!pmtmr_ioport) if (!pmtmr_ioport)
return -ENODEV; return -ENODEV;
...@@ -192,30 +194,27 @@ static int __init init_acpi_pm_clocksource(void) ...@@ -192,30 +194,27 @@ static int __init init_acpi_pm_clocksource(void)
/* "verify" this timing source: */ /* "verify" this timing source: */
for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) { for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {
udelay(100 * j);
value1 = clocksource_acpi_pm.read(); value1 = clocksource_acpi_pm.read();
for (i = 0; i < 10000; i++) { for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {
value2 = clocksource_acpi_pm.read(); value2 = clocksource_acpi_pm.read();
if (value2 == value1) if (value2 == value1)
continue; continue;
if (value2 > value1) if (value2 > value1)
good++;
break; break;
if ((value2 < value1) && ((value2) < 0xFFF)) if ((value2 < value1) && ((value2) < 0xFFF))
good++;
break; break;
printk(KERN_INFO "PM-Timer had inconsistent results:" printk(KERN_INFO "PM-Timer had inconsistent results:"
" 0x%#llx, 0x%#llx - aborting.\n", " 0x%#llx, 0x%#llx - aborting.\n",
value1, value2); value1, value2);
return -EINVAL; return -EINVAL;
} }
udelay(300 * i); if (i == ACPI_PM_READ_CHECKS) {
}
if (good != ACPI_PM_MONOTONICITY_CHECKS) {
printk(KERN_INFO "PM-Timer failed consistency check " printk(KERN_INFO "PM-Timer failed consistency check "
" (0x%#llx) - aborting.\n", value1); " (0x%#llx) - aborting.\n", value1);
return -ENODEV; return -ENODEV;
} }
}
if (verify_pmtmr_rate() != 0) if (verify_pmtmr_rate() != 0)
return -ENODEV; return -ENODEV;
......
...@@ -71,6 +71,16 @@ void clockevents_set_mode(struct clock_event_device *dev, ...@@ -71,6 +71,16 @@ void clockevents_set_mode(struct clock_event_device *dev,
} }
} }
/**
* clockevents_shutdown - shutdown the device and clear next_event
* @dev: device to shutdown
*/
void clockevents_shutdown(struct clock_event_device *dev)
{
clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
dev->next_event.tv64 = KTIME_MAX;
}
/** /**
* clockevents_program_event - Reprogram the clock event device. * clockevents_program_event - Reprogram the clock event device.
* @expires: absolute expiry time (monotonic clock) * @expires: absolute expiry time (monotonic clock)
...@@ -206,7 +216,7 @@ void clockevents_exchange_device(struct clock_event_device *old, ...@@ -206,7 +216,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
if (new) { if (new) {
BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED); BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED);
clockevents_set_mode(new, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(new);
} }
local_irq_restore(flags); local_irq_restore(flags);
} }
......
...@@ -236,8 +236,7 @@ static void tick_do_broadcast_on_off(void *why) ...@@ -236,8 +236,7 @@ static void tick_do_broadcast_on_off(void *why)
if (!cpu_isset(cpu, tick_broadcast_mask)) { if (!cpu_isset(cpu, tick_broadcast_mask)) {
cpu_set(cpu, tick_broadcast_mask); cpu_set(cpu, tick_broadcast_mask);
if (td->mode == TICKDEV_MODE_PERIODIC) if (td->mode == TICKDEV_MODE_PERIODIC)
clockevents_set_mode(dev, clockevents_shutdown(dev);
CLOCK_EVT_MODE_SHUTDOWN);
} }
if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE) if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
tick_broadcast_force = 1; tick_broadcast_force = 1;
...@@ -254,7 +253,7 @@ static void tick_do_broadcast_on_off(void *why) ...@@ -254,7 +253,7 @@ static void tick_do_broadcast_on_off(void *why)
if (cpus_empty(tick_broadcast_mask)) { if (cpus_empty(tick_broadcast_mask)) {
if (!bc_stopped) if (!bc_stopped)
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(bc);
} else if (bc_stopped) { } else if (bc_stopped) {
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
tick_broadcast_start_periodic(bc); tick_broadcast_start_periodic(bc);
...@@ -306,7 +305,7 @@ void tick_shutdown_broadcast(unsigned int *cpup) ...@@ -306,7 +305,7 @@ void tick_shutdown_broadcast(unsigned int *cpup)
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) { if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
if (bc && cpus_empty(tick_broadcast_mask)) if (bc && cpus_empty(tick_broadcast_mask))
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(bc);
} }
spin_unlock_irqrestore(&tick_broadcast_lock, flags); spin_unlock_irqrestore(&tick_broadcast_lock, flags);
...@@ -321,7 +320,7 @@ void tick_suspend_broadcast(void) ...@@ -321,7 +320,7 @@ void tick_suspend_broadcast(void)
bc = tick_broadcast_device.evtdev; bc = tick_broadcast_device.evtdev;
if (bc) if (bc)
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(bc);
spin_unlock_irqrestore(&tick_broadcast_lock, flags); spin_unlock_irqrestore(&tick_broadcast_lock, flags);
} }
......
...@@ -249,7 +249,7 @@ static int tick_check_new_device(struct clock_event_device *newdev) ...@@ -249,7 +249,7 @@ static int tick_check_new_device(struct clock_event_device *newdev)
* not give it back to the clockevents layer ! * not give it back to the clockevents layer !
*/ */
if (tick_is_broadcast_device(curdev)) { if (tick_is_broadcast_device(curdev)) {
clockevents_set_mode(curdev, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(curdev);
curdev = NULL; curdev = NULL;
} }
clockevents_exchange_device(curdev, newdev); clockevents_exchange_device(curdev, newdev);
...@@ -311,7 +311,7 @@ static void tick_suspend(void) ...@@ -311,7 +311,7 @@ static void tick_suspend(void)
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&tick_device_lock, flags); spin_lock_irqsave(&tick_device_lock, flags);
clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_SHUTDOWN); clockevents_shutdown(td->evtdev);
spin_unlock_irqrestore(&tick_device_lock, flags); spin_unlock_irqrestore(&tick_device_lock, flags);
} }
......
...@@ -10,6 +10,8 @@ extern int tick_do_timer_cpu __read_mostly; ...@@ -10,6 +10,8 @@ extern int tick_do_timer_cpu __read_mostly;
extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
extern void tick_handle_periodic(struct clock_event_device *dev); extern void tick_handle_periodic(struct clock_event_device *dev);
extern void clockevents_shutdown(struct clock_event_device *dev);
/* /*
* NO_HZ / high resolution timer shared code * NO_HZ / high resolution timer shared code
*/ */
......
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