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Commit 789bdd5b authored by Linux Build Service Account's avatar Linux Build Service Account Committed by Gerrit - the friendly Code Review server
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Merge "ARM: arch_timer: force re-selection of the best clocksource"

parents 4a900803 01c4ad06

drivers/clocksource/arm_arch_timer.c

+1 −0
Original line number Diff line number Diff line
@@ -687,6 +687,7 @@ static void __init arch_timer_common_init(void) 
	arch_timer_banner(arch_timers_present);

	arch_counter_register(arch_timers_present);

	arch_timer_arch_init();

	clocksource_select_force();

}



static void __init arch_timer_init(void)

include/linux/clocksource.h

+1 −0
Original line number Diff line number Diff line
@@ -186,6 +186,7 @@ extern void clocksource_suspend(void); 
extern void clocksource_resume(void);

extern struct clocksource * __init clocksource_default_clock(void);

extern void clocksource_mark_unstable(struct clocksource *cs);

extern void clocksource_select_force(void);



extern u64

clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);

kernel/time/clocksource.c

+34 −14
Original line number Diff line number Diff line
@@ -108,7 +108,7 @@ static int finished_booting; 


#ifdef CONFIG_CLOCKSOURCE_WATCHDOG

static void clocksource_watchdog_work(struct work_struct *work);

static void clocksource_select(void);

static void clocksource_select(bool force);



static LIST_HEAD(watchdog_list);

static struct clocksource *watchdog;
@@ -415,7 +415,7 @@ static int clocksource_watchdog_kthread(void *data) 
{

	mutex_lock(&clocksource_mutex);

	if (__clocksource_watchdog_kthread())

		clocksource_select();

		clocksource_select(false);

	mutex_unlock(&clocksource_mutex);

	return 0;

}
@@ -555,11 +555,12 @@ static inline void clocksource_update_max_deferment(struct clocksource *cs) 


#ifndef CONFIG_ARCH_USES_GETTIMEOFFSET



static struct clocksource *clocksource_find_best(bool oneshot, bool skipcur)

static struct clocksource *clocksource_find_best(bool oneshot, bool skipcur,

						bool force)

{

	struct clocksource *cs;



	if (!finished_booting || list_empty(&clocksource_list))

	if ((!finished_booting && !force) || list_empty(&clocksource_list))

		return NULL;



	/*
@@ -577,13 +578,13 @@ static struct clocksource *clocksource_find_best(bool oneshot, bool skipcur) 
	return NULL;

}



static void __clocksource_select(bool skipcur)

static void __clocksource_select(bool skipcur, bool force)

{

	bool oneshot = tick_oneshot_mode_active();

	struct clocksource *best, *cs;



	/* Find the best suitable clocksource */

	best = clocksource_find_best(oneshot, skipcur);

	best = clocksource_find_best(oneshot, skipcur, force);

	if (!best)

		return;
@@ -623,22 +624,40 @@ static void __clocksource_select(bool skipcur) 
 * Select the clocksource with the best rating, or the clocksource,

 * which is selected by userspace override.

 */

static void clocksource_select(void)

static void clocksource_select(bool force)

{

	__clocksource_select(false);

	return __clocksource_select(false, force);

}



static void clocksource_select_fallback(void)

{

	__clocksource_select(true);

	__clocksource_select(true, false);

}



#else /* !CONFIG_ARCH_USES_GETTIMEOFFSET */

static inline void clocksource_select(void) { }



static inline void clocksource_select(bool force) { }

static inline void clocksource_select_fallback(void) { }



#endif



/**

 * clocksource_select_force - Force re-selection of the best clocksource

 *				among registered clocksources

 *

 * clocksource_select() can't select the best clocksource before

 * calling clocksource_done_booting() and since clocksource_select()

 * should be called with clocksource_mutex held, provide a new API

 * can be called from other files to select best clockrouce irrespective

 * of finished_booting flag.

 */

void clocksource_select_force(void)

{

	mutex_lock(&clocksource_mutex);

	clocksource_select(true);

	mutex_unlock(&clocksource_mutex);

}



/*

 * clocksource_done_booting - Called near the end of core bootup

 *
@@ -655,7 +674,7 @@ static int __init clocksource_done_booting(void) 
	 * Run the watchdog first to eliminate unstable clock sources

	 */

	__clocksource_watchdog_kthread();

	clocksource_select();

	clocksource_select(false);

	mutex_unlock(&clocksource_mutex);

	return 0;

}
@@ -744,6 +763,7 @@ void __clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq 
}

EXPORT_SYMBOL_GPL(__clocksource_update_freq_scale);





/**

 * __clocksource_register_scale - Used to install new clocksources

 * @cs:		clocksource to be registered
@@ -765,7 +785,7 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq) 
	mutex_lock(&clocksource_mutex);

	clocksource_enqueue(cs);

	clocksource_enqueue_watchdog(cs);

	clocksource_select();

	clocksource_select(false);

	clocksource_select_watchdog(false);

	mutex_unlock(&clocksource_mutex);

	return 0;
@@ -788,7 +808,7 @@ void clocksource_change_rating(struct clocksource *cs, int rating) 
{

	mutex_lock(&clocksource_mutex);

	__clocksource_change_rating(cs, rating);

	clocksource_select();

	clocksource_select(false);

	clocksource_select_watchdog(false);

	mutex_unlock(&clocksource_mutex);

}
@@ -892,7 +912,7 @@ static ssize_t sysfs_override_clocksource(struct device *dev, 


	ret = sysfs_get_uname(buf, override_name, count);

	if (ret >= 0)

		clocksource_select();

		clocksource_select(false);



	mutex_unlock(&clocksource_mutex);