diff options
Diffstat (limited to 'kernel/time/timer.c')
| -rw-r--r-- | kernel/time/timer.c | 78 |
1 files changed, 18 insertions, 60 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 4d915c0a263c..553fa469d7cc 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -386,32 +386,6 @@ static unsigned long round_jiffies_common(unsigned long j, int cpu, } /** - * __round_jiffies - function to round jiffies to a full second - * @j: the time in (absolute) jiffies that should be rounded - * @cpu: the processor number on which the timeout will happen - * - * __round_jiffies() rounds an absolute time in the future (in jiffies) - * up or down to (approximately) full seconds. This is useful for timers - * for which the exact time they fire does not matter too much, as long as - * they fire approximately every X seconds. - * - * By rounding these timers to whole seconds, all such timers will fire - * at the same time, rather than at various times spread out. The goal - * of this is to have the CPU wake up less, which saves power. - * - * The exact rounding is skewed for each processor to avoid all - * processors firing at the exact same time, which could lead - * to lock contention or spurious cache line bouncing. - * - * The return value is the rounded version of the @j parameter. - */ -unsigned long __round_jiffies(unsigned long j, int cpu) -{ - return round_jiffies_common(j, cpu, false); -} -EXPORT_SYMBOL_GPL(__round_jiffies); - -/** * __round_jiffies_relative - function to round jiffies to a full second * @j: the time in (relative) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen @@ -483,22 +457,6 @@ unsigned long round_jiffies_relative(unsigned long j) EXPORT_SYMBOL_GPL(round_jiffies_relative); /** - * __round_jiffies_up - function to round jiffies up to a full second - * @j: the time in (absolute) jiffies that should be rounded - * @cpu: the processor number on which the timeout will happen - * - * This is the same as __round_jiffies() except that it will never - * round down. This is useful for timeouts for which the exact time - * of firing does not matter too much, as long as they don't fire too - * early. - */ -unsigned long __round_jiffies_up(unsigned long j, int cpu) -{ - return round_jiffies_common(j, cpu, true); -} -EXPORT_SYMBOL_GPL(__round_jiffies_up); - -/** * __round_jiffies_up_relative - function to round jiffies up to a full second * @j: the time in (relative) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen @@ -850,7 +808,7 @@ static void do_init_timer(struct timer_list *timer, unsigned int flags, const char *name, struct lock_class_key *key); -void init_timer_on_stack_key(struct timer_list *timer, +void timer_init_key_on_stack(struct timer_list *timer, void (*func)(struct timer_list *), unsigned int flags, const char *name, struct lock_class_key *key) @@ -858,13 +816,13 @@ void init_timer_on_stack_key(struct timer_list *timer, debug_object_init_on_stack(timer, &timer_debug_descr); do_init_timer(timer, func, flags, name, key); } -EXPORT_SYMBOL_GPL(init_timer_on_stack_key); +EXPORT_SYMBOL_GPL(timer_init_key_on_stack); -void destroy_timer_on_stack(struct timer_list *timer) +void timer_destroy_on_stack(struct timer_list *timer) { debug_object_free(timer, &timer_debug_descr); } -EXPORT_SYMBOL_GPL(destroy_timer_on_stack); +EXPORT_SYMBOL_GPL(timer_destroy_on_stack); #else static inline void debug_timer_init(struct timer_list *timer) { } @@ -904,7 +862,7 @@ static void do_init_timer(struct timer_list *timer, } /** - * init_timer_key - initialize a timer + * timer_init_key - initialize a timer * @timer: the timer to be initialized * @func: timer callback function * @flags: timer flags @@ -912,17 +870,17 @@ static void do_init_timer(struct timer_list *timer, * @key: lockdep class key of the fake lock used for tracking timer * sync lock dependencies * - * init_timer_key() must be done to a timer prior to calling *any* of the + * timer_init_key() must be done to a timer prior to calling *any* of the * other timer functions. */ -void init_timer_key(struct timer_list *timer, +void timer_init_key(struct timer_list *timer, void (*func)(struct timer_list *), unsigned int flags, const char *name, struct lock_class_key *key) { debug_init(timer); do_init_timer(timer, func, flags, name, key); } -EXPORT_SYMBOL(init_timer_key); +EXPORT_SYMBOL(timer_init_key); static inline void detach_timer(struct timer_list *timer, bool clear_pending) { @@ -1511,7 +1469,7 @@ static int __try_to_del_timer_sync(struct timer_list *timer, bool shutdown) } /** - * try_to_del_timer_sync - Try to deactivate a timer + * timer_delete_sync_try - Try to deactivate a timer * @timer: Timer to deactivate * * This function tries to deactivate a timer. On success the timer is not @@ -1526,11 +1484,11 @@ static int __try_to_del_timer_sync(struct timer_list *timer, bool shutdown) * * %1 - The timer was pending and deactivated * * %-1 - The timer callback function is running on a different CPU */ -int try_to_del_timer_sync(struct timer_list *timer) +int timer_delete_sync_try(struct timer_list *timer) { return __try_to_del_timer_sync(timer, false); } -EXPORT_SYMBOL(try_to_del_timer_sync); +EXPORT_SYMBOL(timer_delete_sync_try); #ifdef CONFIG_PREEMPT_RT static __init void timer_base_init_expiry_lock(struct timer_base *base) @@ -1900,7 +1858,7 @@ static void timer_recalc_next_expiry(struct timer_base *base) unsigned long clk, next, adj; unsigned lvl, offset = 0; - next = base->clk + NEXT_TIMER_MAX_DELTA; + next = base->clk + TIMER_NEXT_MAX_DELTA; clk = base->clk; for (lvl = 0; lvl < LVL_DEPTH; lvl++, offset += LVL_SIZE) { int pos = next_pending_bucket(base, offset, clk & LVL_MASK); @@ -1963,7 +1921,7 @@ static void timer_recalc_next_expiry(struct timer_base *base) WRITE_ONCE(base->next_expiry, next); base->next_expiry_recalc = false; - base->timers_pending = !(next == base->clk + NEXT_TIMER_MAX_DELTA); + base->timers_pending = !(next == base->clk + TIMER_NEXT_MAX_DELTA); } #ifdef CONFIG_NO_HZ_COMMON @@ -2015,7 +1973,7 @@ static unsigned long next_timer_interrupt(struct timer_base *base, * easy comparable to find out which base holds the first pending timer. */ if (!base->timers_pending) - WRITE_ONCE(base->next_expiry, basej + NEXT_TIMER_MAX_DELTA); + WRITE_ONCE(base->next_expiry, basej + TIMER_NEXT_MAX_DELTA); return base->next_expiry; } @@ -2399,7 +2357,7 @@ static inline void __run_timers(struct timer_base *base) * timer at this clk are that all matching timers have been * dequeued or no timer has been queued since * base::next_expiry was set to base::clk + - * NEXT_TIMER_MAX_DELTA. + * TIMER_NEXT_MAX_DELTA. */ WARN_ON_ONCE(!levels && !base->next_expiry_recalc && base->timers_pending); @@ -2544,7 +2502,7 @@ int timers_prepare_cpu(unsigned int cpu) for (b = 0; b < NR_BASES; b++) { base = per_cpu_ptr(&timer_bases[b], cpu); base->clk = jiffies; - base->next_expiry = base->clk + NEXT_TIMER_MAX_DELTA; + base->next_expiry = base->clk + TIMER_NEXT_MAX_DELTA; base->next_expiry_recalc = false; base->timers_pending = false; base->is_idle = false; @@ -2599,7 +2557,7 @@ static void __init init_timer_cpu(int cpu) base->cpu = cpu; raw_spin_lock_init(&base->lock); base->clk = jiffies; - base->next_expiry = base->clk + NEXT_TIMER_MAX_DELTA; + base->next_expiry = base->clk + TIMER_NEXT_MAX_DELTA; timer_base_init_expiry_lock(base); } } @@ -2612,7 +2570,7 @@ static void __init init_timer_cpus(void) init_timer_cpu(cpu); } -void __init init_timers(void) +void __init timers_init(void) { init_timer_cpus(); posix_cputimers_init_work(); |