time/timers: Move all time(r) related files into kernel/time

Except for Kconfig.HZ. That needs a separate treatment.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 1734 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
deleted file mode 100644
index 3bb01a323b2a..000000000000
--- a/kernel/timer.c
+++ /dev/null
@@ -1,1734 +0,0 @@
-/*
- *  linux/kernel/timer.c
- *
- *  Kernel internal timers
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  1997-01-28  Modified by Finn Arne Gangstad to make timers scale better.
- *
- *  1997-09-10  Updated NTP code according to technical memorandum Jan '96
- *              "A Kernel Model for Precision Timekeeping" by Dave Mills
- *  1998-12-24  Fixed a xtime SMP race (we need the xtime_lock rw spinlock to
- *              serialize accesses to xtime/lost_ticks).
- *                              Copyright (C) 1998  Andrea Arcangeli
- *  1999-03-10  Improved NTP compatibility by Ulrich Windl
- *  2002-05-31	Move sys_sysinfo here and make its locking sane, Robert Love
- *  2000-10-05  Implemented scalable SMP per-CPU timer handling.
- *                              Copyright (C) 2000, 2001, 2002  Ingo Molnar
- *              Designed by David S. Miller, Alexey Kuznetsov and Ingo Molnar
- */
-
-#include <linux/kernel_stat.h>
-#include <linux/export.h>
-#include <linux/interrupt.h>
-#include <linux/percpu.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/swap.h>
-#include <linux/pid_namespace.h>
-#include <linux/notifier.h>
-#include <linux/thread_info.h>
-#include <linux/time.h>
-#include <linux/jiffies.h>
-#include <linux/posix-timers.h>
-#include <linux/cpu.h>
-#include <linux/syscalls.h>
-#include <linux/delay.h>
-#include <linux/tick.h>
-#include <linux/kallsyms.h>
-#include <linux/irq_work.h>
-#include <linux/sched.h>
-#include <linux/sched/sysctl.h>
-#include <linux/slab.h>
-#include <linux/compat.h>
-
-#include <asm/uaccess.h>
-#include <asm/unistd.h>
-#include <asm/div64.h>
-#include <asm/timex.h>
-#include <asm/io.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/timer.h>
-
-__visible u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;
-
-EXPORT_SYMBOL(jiffies_64);
-
-/*
- * per-CPU timer vector definitions:
- */
-#define TVN_BITS (CONFIG_BASE_SMALL ? 4 : 6)
-#define TVR_BITS (CONFIG_BASE_SMALL ? 6 : 8)
-#define TVN_SIZE (1 << TVN_BITS)
-#define TVR_SIZE (1 << TVR_BITS)
-#define TVN_MASK (TVN_SIZE - 1)
-#define TVR_MASK (TVR_SIZE - 1)
-#define MAX_TVAL ((unsigned long)((1ULL << (TVR_BITS + 4*TVN_BITS)) - 1))
-
-struct tvec {
-	struct list_head vec[TVN_SIZE];
-};
-
-struct tvec_root {
-	struct list_head vec[TVR_SIZE];
-};
-
-struct tvec_base {
-	spinlock_t lock;
-	struct timer_list *running_timer;
-	unsigned long timer_jiffies;
-	unsigned long next_timer;
-	unsigned long active_timers;
-	unsigned long all_timers;
-	struct tvec_root tv1;
-	struct tvec tv2;
-	struct tvec tv3;
-	struct tvec tv4;
-	struct tvec tv5;
-} ____cacheline_aligned;
-
-struct tvec_base boot_tvec_bases;
-EXPORT_SYMBOL(boot_tvec_bases);
-static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
-
-/* Functions below help us manage 'deferrable' flag */
-static inline unsigned int tbase_get_deferrable(struct tvec_base *base)
-{
-	return ((unsigned int)(unsigned long)base & TIMER_DEFERRABLE);
-}
-
-static inline unsigned int tbase_get_irqsafe(struct tvec_base *base)
-{
-	return ((unsigned int)(unsigned long)base & TIMER_IRQSAFE);
-}
-
-static inline struct tvec_base *tbase_get_base(struct tvec_base *base)
-{
-	return ((struct tvec_base *)((unsigned long)base & ~TIMER_FLAG_MASK));
-}
-
-static inline void
-timer_set_base(struct timer_list *timer, struct tvec_base *new_base)
-{
-	unsigned long flags = (unsigned long)timer->base & TIMER_FLAG_MASK;
-
-	timer->base = (struct tvec_base *)((unsigned long)(new_base) | flags);
-}
-
-static unsigned long round_jiffies_common(unsigned long j, int cpu,
-		bool force_up)
-{
-	int rem;
-	unsigned long original = j;
-
-	/*
-	 * We don't want all cpus firing their timers at once hitting the
-	 * same lock or cachelines, so we skew each extra cpu with an extra
-	 * 3 jiffies. This 3 jiffies came originally from the mm/ code which
-	 * already did this.
-	 * The skew is done by adding 3*cpunr, then round, then subtract this
-	 * extra offset again.
-	 */
-	j += cpu * 3;
-
-	rem = j % HZ;
-
-	/*
-	 * If the target jiffie is just after a whole second (which can happen
-	 * due to delays of the timer irq, long irq off times etc etc) then
-	 * we should round down to the whole second, not up. Use 1/4th second
-	 * as cutoff for this rounding as an extreme upper bound for this.
-	 * But never round down if @force_up is set.
-	 */
-	if (rem < HZ/4 && !force_up) /* round down */
-		j = j - rem;
-	else /* round up */
-		j = j - rem + HZ;
-
-	/* now that we have rounded, subtract the extra skew again */
-	j -= cpu * 3;
-
-	/*
-	 * Make sure j is still in the future. Otherwise return the
-	 * unmodified value.
-	 */
-	return time_is_after_jiffies(j) ? j : original;
-}
-
-/**
- * __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
- *
- * __round_jiffies_relative() rounds a time delta  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_relative(unsigned long j, int cpu)
-{
-	unsigned long j0 = jiffies;
-
-	/* Use j0 because jiffies might change while we run */
-	return round_jiffies_common(j + j0, cpu, false) - j0;
-}
-EXPORT_SYMBOL_GPL(__round_jiffies_relative);
-
-/**
- * round_jiffies - function to round jiffies to a full second
- * @j: the time in (absolute) jiffies that should be rounded
- *
- * 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 return value is the rounded version of the @j parameter.
- */
-unsigned long round_jiffies(unsigned long j)
-{
-	return round_jiffies_common(j, raw_smp_processor_id(), 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
- *
- * round_jiffies_relative() rounds a time delta  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 return value is the rounded version of the @j parameter.
- */
-unsigned long round_jiffies_relative(unsigned long j)
-{
-	return __round_jiffies_relative(j, raw_smp_processor_id());
-}
-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
- *
- * This is the same as __round_jiffies_relative() 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_relative(unsigned long j, int cpu)
-{
-	unsigned long j0 = jiffies;
-
-	/* Use j0 because jiffies might change while we run */
-	return round_jiffies_common(j + j0, cpu, true) - j0;
-}
-EXPORT_SYMBOL_GPL(__round_jiffies_up_relative);
-
-/**
- * round_jiffies_up - function to round jiffies up to a full second
- * @j: the time in (absolute) jiffies that should be rounded
- *
- * 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)
-{
-	return round_jiffies_common(j, raw_smp_processor_id(), 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
- *
- * This is the same as round_jiffies_relative() 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_relative(unsigned long j)
-{
-	return __round_jiffies_up_relative(j, raw_smp_processor_id());
-}
-EXPORT_SYMBOL_GPL(round_jiffies_up_relative);
-
-/**
- * set_timer_slack - set the allowed slack for a timer
- * @timer: the timer to be modified
- * @slack_hz: the amount of time (in jiffies) allowed for rounding
- *
- * Set the amount of time, in jiffies, that a certain timer has
- * in terms of slack. By setting this value, the timer subsystem
- * will schedule the actual timer somewhere between
- * the time mod_timer() asks for, and that time plus the slack.
- *
- * By setting the slack to -1, a percentage of the delay is used
- * instead.
- */
-void set_timer_slack(struct timer_list *timer, int slack_hz)
-{
-	timer->slack = slack_hz;
-}
-EXPORT_SYMBOL_GPL(set_timer_slack);
-
-/*
- * If the list is empty, catch up ->timer_jiffies to the current time.
- * The caller must hold the tvec_base lock.  Returns true if the list
- * was empty and therefore ->timer_jiffies was updated.
- */
-static bool catchup_timer_jiffies(struct tvec_base *base)
-{
-	if (!base->all_timers) {
-		base->timer_jiffies = jiffies;
-		return true;
-	}
-	return false;
-}
-
-static void
-__internal_add_timer(struct tvec_base *base, struct timer_list *timer)
-{
-	unsigned long expires = timer->expires;
-	unsigned long idx = expires - base->timer_jiffies;
-	struct list_head *vec;
-
-	if (idx < TVR_SIZE) {
-		int i = expires & TVR_MASK;
-		vec = base->tv1.vec + i;
-	} else if (idx < 1 << (TVR_BITS + TVN_BITS)) {
-		int i = (expires >> TVR_BITS) & TVN_MASK;
-		vec = base->tv2.vec + i;
-	} else if (idx < 1 << (TVR_BITS + 2 * TVN_BITS)) {
-		int i = (expires >> (TVR_BITS + TVN_BITS)) & TVN_MASK;
-		vec = base->tv3.vec + i;
-	} else if (idx < 1 << (TVR_BITS + 3 * TVN_BITS)) {
-		int i = (expires >> (TVR_BITS + 2 * TVN_BITS)) & TVN_MASK;
-		vec = base->tv4.vec + i;
-	} else if ((signed long) idx < 0) {
-		/*
-		 * Can happen if you add a timer with expires == jiffies,
-		 * or you set a timer to go off in the past
-		 */
-		vec = base->tv1.vec + (base->timer_jiffies & TVR_MASK);
-	} else {
-		int i;
-		/* If the timeout is larger than MAX_TVAL (on 64-bit
-		 * architectures or with CONFIG_BASE_SMALL=1) then we
-		 * use the maximum timeout.
-		 */
-		if (idx > MAX_TVAL) {
-			idx = MAX_TVAL;
-			expires = idx + base->timer_jiffies;
-		}
-		i = (expires >> (TVR_BITS + 3 * TVN_BITS)) & TVN_MASK;
-		vec = base->tv5.vec + i;
-	}
-	/*
-	 * Timers are FIFO:
-	 */
-	list_add_tail(&timer->entry, vec);
-}
-
-static void internal_add_timer(struct tvec_base *base, struct timer_list *timer)
-{
-	(void)catchup_timer_jiffies(base);
-	__internal_add_timer(base, timer);
-	/*
-	 * Update base->active_timers and base->next_timer
-	 */
-	if (!tbase_get_deferrable(timer->base)) {
-		if (!base->active_timers++ ||
-		    time_before(timer->expires, base->next_timer))
-			base->next_timer = timer->expires;
-	}
-	base->all_timers++;
-}
-
-#ifdef CONFIG_TIMER_STATS
-void __timer_stats_timer_set_start_info(struct timer_list *timer, void *addr)
-{
-	if (timer->start_site)
-		return;
-
-	timer->start_site = addr;
-	memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
-	timer->start_pid = current->pid;
-}
-
-static void timer_stats_account_timer(struct timer_list *timer)
-{
-	unsigned int flag = 0;
-
-	if (likely(!timer->start_site))
-		return;
-	if (unlikely(tbase_get_deferrable(timer->base)))
-		flag |= TIMER_STATS_FLAG_DEFERRABLE;
-
-	timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
-				 timer->function, timer->start_comm, flag);
-}
-
-#else
-static void timer_stats_account_timer(struct timer_list *timer) {}
-#endif
-
-#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
-
-static struct debug_obj_descr timer_debug_descr;
-
-static void *timer_debug_hint(void *addr)
-{
-	return ((struct timer_list *) addr)->function;
-}
-
-/*
- * fixup_init is called when:
- * - an active object is initialized
- */
-static int timer_fixup_init(void *addr, enum debug_obj_state state)
-{
-	struct timer_list *timer = addr;
-
-	switch (state) {
-	case ODEBUG_STATE_ACTIVE:
-		del_timer_sync(timer);
-		debug_object_init(timer, &timer_debug_descr);
-		return 1;
-	default:
-		return 0;
-	}
-}
-
-/* Stub timer callback for improperly used timers. */
-static void stub_timer(unsigned long data)
-{
-	WARN_ON(1);
-}
-
-/*
- * fixup_activate is called when:
- * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
- */
-static int timer_fixup_activate(void *addr, enum debug_obj_state state)
-{
-	struct timer_list *timer = addr;
-
-	switch (state) {
-
-	case ODEBUG_STATE_NOTAVAILABLE:
-		/*
-		 * This is not really a fixup. The timer was
-		 * statically initialized. We just make sure that it
-		 * is tracked in the object tracker.
-		 */
-		if (timer->entry.next == NULL &&
-		    timer->entry.prev == TIMER_ENTRY_STATIC) {
-			debug_object_init(timer, &timer_debug_descr);
-			debug_object_activate(timer, &timer_debug_descr);
-			return 0;
-		} else {
-			setup_timer(timer, stub_timer, 0);
-			return 1;
-		}
-		return 0;
-
-	case ODEBUG_STATE_ACTIVE:
-		WARN_ON(1);
-
-	default:
-		return 0;
-	}
-}
-
-/*
- * fixup_free is called when:
- * - an active object is freed
- */
-static int timer_fixup_free(void *addr, enum debug_obj_state state)
-{
-	struct timer_list *timer = addr;
-
-	switch (state) {
-	case ODEBUG_STATE_ACTIVE:
-		del_timer_sync(timer);
-		debug_object_free(timer, &timer_debug_descr);
-		return 1;
-	default:
-		return 0;
-	}
-}
-
-/*
- * fixup_assert_init is called when:
- * - an untracked/uninit-ed object is found
- */
-static int timer_fixup_assert_init(void *addr, enum debug_obj_state state)
-{
-	struct timer_list *timer = addr;
-
-	switch (state) {
-	case ODEBUG_STATE_NOTAVAILABLE:
-		if (timer->entry.prev == TIMER_ENTRY_STATIC) {
-			/*
-			 * This is not really a fixup. The timer was
-			 * statically initialized. We just make sure that it
-			 * is tracked in the object tracker.
-			 */
-			debug_object_init(timer, &timer_debug_descr);
-			return 0;
-		} else {
-			setup_timer(timer, stub_timer, 0);
-			return 1;
-		}
-	default:
-		return 0;
-	}
-}
-
-static struct debug_obj_descr timer_debug_descr = {
-	.name			= "timer_list",
-	.debug_hint		= timer_debug_hint,
-	.fixup_init		= timer_fixup_init,
-	.fixup_activate		= timer_fixup_activate,
-	.fixup_free		= timer_fixup_free,
-	.fixup_assert_init	= timer_fixup_assert_init,
-};
-
-static inline void debug_timer_init(struct timer_list *timer)
-{
-	debug_object_init(timer, &timer_debug_descr);
-}
-
-static inline void debug_timer_activate(struct timer_list *timer)
-{
-	debug_object_activate(timer, &timer_debug_descr);
-}
-
-static inline void debug_timer_deactivate(struct timer_list *timer)
-{
-	debug_object_deactivate(timer, &timer_debug_descr);
-}
-
-static inline void debug_timer_free(struct timer_list *timer)
-{
-	debug_object_free(timer, &timer_debug_descr);
-}
-
-static inline void debug_timer_assert_init(struct timer_list *timer)
-{
-	debug_object_assert_init(timer, &timer_debug_descr);
-}
-
-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, unsigned int flags,
-			     const char *name, struct lock_class_key *key)
-{
-	debug_object_init_on_stack(timer, &timer_debug_descr);
-	do_init_timer(timer, flags, name, key);
-}
-EXPORT_SYMBOL_GPL(init_timer_on_stack_key);
-
-void destroy_timer_on_stack(struct timer_list *timer)
-{
-	debug_object_free(timer, &timer_debug_descr);
-}
-EXPORT_SYMBOL_GPL(destroy_timer_on_stack);
-
-#else
-static inline void debug_timer_init(struct timer_list *timer) { }
-static inline void debug_timer_activate(struct timer_list *timer) { }
-static inline void debug_timer_deactivate(struct timer_list *timer) { }
-static inline void debug_timer_assert_init(struct timer_list *timer) { }
-#endif
-
-static inline void debug_init(struct timer_list *timer)
-{
-	debug_timer_init(timer);
-	trace_timer_init(timer);
-}
-
-static inline void
-debug_activate(struct timer_list *timer, unsigned long expires)
-{
-	debug_timer_activate(timer);
-	trace_timer_start(timer, expires);
-}
-
-static inline void debug_deactivate(struct timer_list *timer)
-{
-	debug_timer_deactivate(timer);
-	trace_timer_cancel(timer);
-}
-
-static inline void debug_assert_init(struct timer_list *timer)
-{
-	debug_timer_assert_init(timer);
-}
-
-static void do_init_timer(struct timer_list *timer, unsigned int flags,
-			  const char *name, struct lock_class_key *key)
-{
-	struct tvec_base *base = __raw_get_cpu_var(tvec_bases);
-
-	timer->entry.next = NULL;
-	timer->base = (void *)((unsigned long)base | flags);
-	timer->slack = -1;
-#ifdef CONFIG_TIMER_STATS
-	timer->start_site = NULL;
-	timer->start_pid = -1;
-	memset(timer->start_comm, 0, TASK_COMM_LEN);
-#endif
-	lockdep_init_map(&timer->lockdep_map, name, key, 0);
-}
-
-/**
- * init_timer_key - initialize a timer
- * @timer: the timer to be initialized
- * @flags: timer flags
- * @name: name of the 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 calling *any* of the
- * other timer functions.
- */
-void init_timer_key(struct timer_list *timer, unsigned int flags,
-		    const char *name, struct lock_class_key *key)
-{
-	debug_init(timer);
-	do_init_timer(timer, flags, name, key);
-}
-EXPORT_SYMBOL(init_timer_key);
-
-static inline void detach_timer(struct timer_list *timer, bool clear_pending)
-{
-	struct list_head *entry = &timer->entry;
-
-	debug_deactivate(timer);
-
-	__list_del(entry->prev, entry->next);
-	if (clear_pending)
-		entry->next = NULL;
-	entry->prev = LIST_POISON2;
-}
-
-static inline void
-detach_expired_timer(struct timer_list *timer, struct tvec_base *base)
-{
-	detach_timer(timer, true);
-	if (!tbase_get_deferrable(timer->base))
-		base->active_timers--;
-	base->all_timers--;
-	(void)catchup_timer_jiffies(base);
-}
-
-static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
-			     bool clear_pending)
-{
-	if (!timer_pending(timer))
-		return 0;
-
-	detach_timer(timer, clear_pending);
-	if (!tbase_get_deferrable(timer->base)) {
-		base->active_timers--;
-		if (timer->expires == base->next_timer)
-			base->next_timer = base->timer_jiffies;
-	}
-	base->all_timers--;
-	(void)catchup_timer_jiffies(base);
-	return 1;
-}
-
-/*
- * We are using hashed locking: holding per_cpu(tvec_bases).lock
- * means that all timers which are tied to this base via timer->base are
- * locked, and the base itself is locked too.
- *
- * So __run_timers/migrate_timers can safely modify all timers which could
- * be found on ->tvX lists.
- *
- * When the timer's base is locked, and the timer removed from list, it is
- * possible to set timer->base = NULL and drop the lock: the timer remains
- * locked.
- */
-static struct tvec_base *lock_timer_base(struct timer_list *timer,
-					unsigned long *flags)
-	__acquires(timer->base->lock)
-{
-	struct tvec_base *base;
-
-	for (;;) {
-		struct tvec_base *prelock_base = timer->base;
-		base = tbase_get_base(prelock_base);
-		if (likely(base != NULL)) {
-			spin_lock_irqsave(&base->lock, *flags);
-			if (likely(prelock_base == timer->base))
-				return base;
-			/* The timer has migrated to another CPU */
-			spin_unlock_irqrestore(&base->lock, *flags);
-		}
-		cpu_relax();
-	}
-}
-
-static inline int
-__mod_timer(struct timer_list *timer, unsigned long expires,
-						bool pending_only, int pinned)
-{
-	struct tvec_base *base, *new_base;
-	unsigned long flags;
-	int ret = 0 , cpu;
-
-	timer_stats_timer_set_start_info(timer);
-	BUG_ON(!timer->function);
-
-	base = lock_timer_base(timer, &flags);
-
-	ret = detach_if_pending(timer, base, false);
-	if (!ret && pending_only)
-		goto out_unlock;
-
-	debug_activate(timer, expires);
-
-	cpu = get_nohz_timer_target(pinned);
-	new_base = per_cpu(tvec_bases, cpu);
-
-	if (base != new_base) {
-		/*
-		 * We are trying to schedule the timer on the local CPU.
-		 * However we can't change timer's base while it is running,
-		 * otherwise del_timer_sync() can't detect that the timer's
-		 * handler yet has not finished. This also guarantees that
-		 * the timer is serialized wrt itself.
-		 */
-		if (likely(base->running_timer != timer)) {
-			/* See the comment in lock_timer_base() */
-			timer_set_base(timer, NULL);
-			spin_unlock(&base->lock);
-			base = new_base;
-			spin_lock(&base->lock);
-			timer_set_base(timer, base);
-		}
-	}
-
-	timer->expires = expires;
-	internal_add_timer(base, timer);
-
-out_unlock:
-	spin_unlock_irqrestore(&base->lock, flags);
-
-	return ret;
-}
-
-/**
- * mod_timer_pending - modify a pending timer's timeout
- * @timer: the pending timer to be modified
- * @expires: new timeout in jiffies
- *
- * mod_timer_pending() is the same for pending timers as mod_timer(),
- * but will not re-activate and modify already deleted timers.
- *
- * It is useful for unserialized use of timers.
- */
-int mod_timer_pending(struct timer_list *timer, unsigned long expires)
-{
-	return __mod_timer(timer, expires, true, TIMER_NOT_PINNED);
-}
-EXPORT_SYMBOL(mod_timer_pending);
-
-/*
- * Decide where to put the timer while taking the slack into account
- *
- * Algorithm:
- *   1) calculate the maximum (absolute) time
- *   2) calculate the highest bit where the expires and new max are different
- *   3) use this bit to make a mask
- *   4) use the bitmask to round down the maximum time, so that all last
- *      bits are zeros
- */
-static inline
-unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
-{
-	unsigned long expires_limit, mask;
-	int bit;
-
-	if (timer->slack >= 0) {
-		expires_limit = expires + timer->slack;
-	} else {
-		long delta = expires - jiffies;
-
-		if (delta < 256)
-			return expires;
-
-		expires_limit = expires + delta / 256;
-	}
-	mask = expires ^ expires_limit;
-	if (mask == 0)
-		return expires;
-
-	bit = find_last_bit(&mask, BITS_PER_LONG);
-
-	mask = (1UL << bit) - 1;
-
-	expires_limit = expires_limit & ~(mask);
-
-	return expires_limit;
-}
-
-/**
- * mod_timer - modify a timer's timeout
- * @timer: the timer to be modified
- * @expires: new timeout in jiffies
- *
- * mod_timer() is a more efficient way to update the expire field of an
- * active timer (if the timer is inactive it will be activated)
- *
- * mod_timer(timer, expires) is equivalent to:
- *
- *     del_timer(timer); timer->expires = expires; add_timer(timer);
- *
- * Note that if there are multiple unserialized concurrent users of the
- * same timer, then mod_timer() is the only safe way to modify the timeout,
- * since add_timer() cannot modify an already running timer.
- *
- * The function returns whether it has modified a pending timer or not.
- * (ie. mod_timer() of an inactive timer returns 0, mod_timer() of an
- * active timer returns 1.)
- */
-int mod_timer(struct timer_list *timer, unsigned long expires)
-{
-	expires = apply_slack(timer, expires);
-
-	/*
-	 * This is a common optimization triggered by the
-	 * networking code - if the timer is re-modified
-	 * to be the same thing then just return:
-	 */
-	if (timer_pending(timer) && timer->expires == expires)
-		return 1;
-
-	return __mod_timer(timer, expires, false, TIMER_NOT_PINNED);
-}
-EXPORT_SYMBOL(mod_timer);
-
-/**
- * mod_timer_pinned - modify a timer's timeout
- * @timer: the timer to be modified
- * @expires: new timeout in jiffies
- *
- * mod_timer_pinned() is a way to update the expire field of an
- * active timer (if the timer is inactive it will be activated)
- * and to ensure that the timer is scheduled on the current CPU.
- *
- * Note that this does not prevent the timer from being migrated
- * when the current CPU goes offline.  If this is a problem for
- * you, use CPU-hotplug notifiers to handle it correctly, for
- * example, cancelling the timer when the corresponding CPU goes
- * offline.
- *
- * mod_timer_pinned(timer, expires) is equivalent to:
- *
- *     del_timer(timer); timer->expires = expires; add_timer(timer);
- */
-int mod_timer_pinned(struct timer_list *timer, unsigned long expires)
-{
-	if (timer->expires == expires && timer_pending(timer))
-		return 1;
-
-	return __mod_timer(timer, expires, false, TIMER_PINNED);
-}
-EXPORT_SYMBOL(mod_timer_pinned);
-
-/**
- * add_timer - start a timer
- * @timer: the timer to be added
- *
- * The kernel will do a ->function(->data) callback from the
- * timer interrupt at the ->expires point in the future. The
- * current time is 'jiffies'.
- *
- * The timer's ->expires, ->function (and if the handler uses it, ->data)
- * fields must be set prior calling this function.
- *
- * Timers with an ->expires field in the past will be executed in the next
- * timer tick.
- */
-void add_timer(struct timer_list *timer)
-{
-	BUG_ON(timer_pending(timer));
-	mod_timer(timer, timer->expires);
-}
-EXPORT_SYMBOL(add_timer);
-
-/**
- * add_timer_on - start a timer on a particular CPU
- * @timer: the timer to be added
- * @cpu: the CPU to start it on
- *
- * This is not very scalable on SMP. Double adds are not possible.
- */
-void add_timer_on(struct timer_list *timer, int cpu)
-{
-	struct tvec_base *base = per_cpu(tvec_bases, cpu);
-	unsigned long flags;
-
-	timer_stats_timer_set_start_info(timer);
-	BUG_ON(timer_pending(timer) || !timer->function);
-	spin_lock_irqsave(&base->lock, flags);
-	timer_set_base(timer, base);
-	debug_activate(timer, timer->expires);
-	internal_add_timer(base, timer);
-	/*
-	 * Check whether the other CPU is in dynticks mode and needs
-	 * to be triggered to reevaluate the timer wheel.
-	 * We are protected against the other CPU fiddling
-	 * with the timer by holding the timer base lock. This also
-	 * makes sure that a CPU on the way to stop its tick can not
-	 * evaluate the timer wheel.
-	 *
-	 * Spare the IPI for deferrable timers on idle targets though.
-	 * The next busy ticks will take care of it. Except full dynticks
-	 * require special care against races with idle_cpu(), lets deal
-	 * with that later.
-	 */
-	if (!tbase_get_deferrable(timer->base) || tick_nohz_full_cpu(cpu))
-		wake_up_nohz_cpu(cpu);
-
-	spin_unlock_irqrestore(&base->lock, flags);
-}
-EXPORT_SYMBOL_GPL(add_timer_on);
-
-/**
- * del_timer - deactive a timer.
- * @timer: the timer to be deactivated
- *
- * del_timer() deactivates a timer - this works on both active and inactive
- * timers.
- *
- * The function returns whether it has deactivated a pending timer or not.
- * (ie. del_timer() of an inactive timer returns 0, del_timer() of an
- * active timer returns 1.)
- */
-int del_timer(struct timer_list *timer)
-{
-	struct tvec_base *base;
-	unsigned long flags;
-	int ret = 0;
-
-	debug_assert_init(timer);
-
-	timer_stats_timer_clear_start_info(timer);
-	if (timer_pending(timer)) {
-		base = lock_timer_base(timer, &flags);
-		ret = detach_if_pending(timer, base, true);
-		spin_unlock_irqrestore(&base->lock, flags);
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL(del_timer);
-
-/**
- * try_to_del_timer_sync - Try to deactivate a timer
- * @timer: timer do del
- *
- * This function tries to deactivate a timer. Upon successful (ret >= 0)
- * exit the timer is not queued and the handler is not running on any CPU.
- */
-int try_to_del_timer_sync(struct timer_list *timer)
-{
-	struct tvec_base *base;
-	unsigned long flags;
-	int ret = -1;
-
-	debug_assert_init(timer);
-
-	base = lock_timer_base(timer, &flags);
-
-	if (base->running_timer != timer) {
-		timer_stats_timer_clear_start_info(timer);
-		ret = detach_if_pending(timer, base, true);
-	}
-	spin_unlock_irqrestore(&base->lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL(try_to_del_timer_sync);
-
-#ifdef CONFIG_SMP
-/**
- * del_timer_sync - deactivate a timer and wait for the handler to finish.
- * @timer: the timer to be deactivated
- *
- * This function only differs from del_timer() on SMP: besides deactivating
- * the timer it also makes sure the handler has finished executing on other
- * CPUs.
- *
- * Synchronization rules: Callers must prevent restarting of the timer,
- * otherwise this function is meaningless. It must not be called from
- * interrupt contexts unless the timer is an irqsafe one. The caller must
- * not hold locks which would prevent completion of the timer's
- * handler. The timer's handler must not call add_timer_on(). Upon exit the
- * timer is not queued and the handler is not running on any CPU.
- *
- * Note: For !irqsafe timers, you must not hold locks that are held in
- *   interrupt context while calling this function. Even if the lock has
- *   nothing to do with the timer in question.  Here's why:
- *
- *    CPU0                             CPU1
- *    ----                             ----
- *                                   <SOFTIRQ>
- *                                   call_timer_fn();
- *                                     base->running_timer = mytimer;
- *  spin_lock_irq(somelock);
- *                                     <IRQ>
- *                                        spin_lock(somelock);
- *  del_timer_sync(mytimer);
- *   while (base->running_timer == mytimer);
- *
- * Now del_timer_sync() will never return and never release somelock.
- * The interrupt on the other CPU is waiting to grab somelock but
- * it has interrupted the softirq that CPU0 is waiting to finish.
- *
- * The function returns whether it has deactivated a pending timer or not.
- */
-int del_timer_sync(struct timer_list *timer)
-{
-#ifdef CONFIG_LOCKDEP
-	unsigned long flags;
-
-	/*
-	 * If lockdep gives a backtrace here, please reference
-	 * the synchronization rules above.
-	 */
-	local_irq_save(flags);
-	lock_map_acquire(&timer->lockdep_map);
-	lock_map_release(&timer->lockdep_map);
-	local_irq_restore(flags);
-#endif
-	/*
-	 * don't use it in hardirq context, because it
-	 * could lead to deadlock.
-	 */
-	WARN_ON(in_irq() && !tbase_get_irqsafe(timer->base));
-	for (;;) {
-		int ret = try_to_del_timer_sync(timer);
-		if (ret >= 0)
-			return ret;
-		cpu_relax();
-	}
-}
-EXPORT_SYMBOL(del_timer_sync);
-#endif
-
-static int cascade(struct tvec_base *base, struct tvec *tv, int index)
-{
-	/* cascade all the timers from tv up one level */
-	struct timer_list *timer, *tmp;
-	struct list_head tv_list;
-
-	list_replace_init(tv->vec + index, &tv_list);
-
-	/*
-	 * We are removing _all_ timers from the list, so we
-	 * don't have to detach them individually.
-	 */
-	list_for_each_entry_safe(timer, tmp, &tv_list, entry) {
-		BUG_ON(tbase_get_base(timer->base) != base);
-		/* No accounting, while moving them */
-		__internal_add_timer(base, timer);
-	}
-
-	return index;
-}
-
-static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long),
-			  unsigned long data)
-{
-	int count = preempt_count();
-
-#ifdef CONFIG_LOCKDEP
-	/*
-	 * It is permissible to free the timer from inside the
-	 * function that is called from it, this we need to take into
-	 * account for lockdep too. To avoid bogus "held lock freed"
-	 * warnings as well as problems when looking into
-	 * timer->lockdep_map, make a copy and use that here.
-	 */
-	struct lockdep_map lockdep_map;
-
-	lockdep_copy_map(&lockdep_map, &timer->lockdep_map);
-#endif
-	/*
-	 * Couple the lock chain with the lock chain at
-	 * del_timer_sync() by acquiring the lock_map around the fn()
-	 * call here and in del_timer_sync().
-	 */
-	lock_map_acquire(&lockdep_map);
-
-	trace_timer_expire_entry(timer);
-	fn(data);
-	trace_timer_expire_exit(timer);
-
-	lock_map_release(&lockdep_map);
-
-	if (count != preempt_count()) {
-		WARN_ONCE(1, "timer: %pF preempt leak: %08x -> %08x\n",
-			  fn, count, preempt_count());
-		/*
-		 * Restore the preempt count. That gives us a decent
-		 * chance to survive and extract information. If the
-		 * callback kept a lock held, bad luck, but not worse
-		 * than the BUG() we had.
-		 */
-		preempt_count_set(count);
-	}
-}
-
-#define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK)
-
-/**
- * __run_timers - run all expired timers (if any) on this CPU.
- * @base: the timer vector to be processed.
- *
- * This function cascades all vectors and executes all expired timer
- * vectors.
- */
-static inline void __run_timers(struct tvec_base *base)
-{
-	struct timer_list *timer;
-
-	spin_lock_irq(&base->lock);
-	if (catchup_timer_jiffies(base)) {
-		spin_unlock_irq(&base->lock);
-		return;
-	}
-	while (time_after_eq(jiffies, base->timer_jiffies)) {
-		struct list_head work_list;
-		struct list_head *head = &work_list;
-		int index = base->timer_jiffies & TVR_MASK;
-
-		/*
-		 * Cascade timers:
-		 */
-		if (!index &&
-			(!cascade(base, &base->tv2, INDEX(0))) &&
-				(!cascade(base, &base->tv3, INDEX(1))) &&
-					!cascade(base, &base->tv4, INDEX(2)))
-			cascade(base, &base->tv5, INDEX(3));
-		++base->timer_jiffies;
-		list_replace_init(base->tv1.vec + index, head);
-		while (!list_empty(head)) {
-			void (*fn)(unsigned long);
-			unsigned long data;
-			bool irqsafe;
-
-			timer = list_first_entry(head, struct timer_list,entry);
-			fn = timer->function;
-			data = timer->data;
-			irqsafe = tbase_get_irqsafe(timer->base);
-
-			timer_stats_account_timer(timer);
-
-			base->running_timer = timer;
-			detach_expired_timer(timer, base);
-
-			if (irqsafe) {
-				spin_unlock(&base->lock);
-				call_timer_fn(timer, fn, data);
-				spin_lock(&base->lock);
-			} else {
-				spin_unlock_irq(&base->lock);
-				call_timer_fn(timer, fn, data);
-				spin_lock_irq(&base->lock);
-			}
-		}
-	}
-	base->running_timer = NULL;
-	spin_unlock_irq(&base->lock);
-}
-
-#ifdef CONFIG_NO_HZ_COMMON
-/*
- * Find out when the next timer event is due to happen. This
- * is used on S/390 to stop all activity when a CPU is idle.
- * This function needs to be called with interrupts disabled.
- */
-static unsigned long __next_timer_interrupt(struct tvec_base *base)
-{
-	unsigned long timer_jiffies = base->timer_jiffies;
-	unsigned long expires = timer_jiffies + NEXT_TIMER_MAX_DELTA;
-	int index, slot, array, found = 0;
-	struct timer_list *nte;
-	struct tvec *varray[4];
-
-	/* Look for timer events in tv1. */
-	index = slot = timer_jiffies & TVR_MASK;
-	do {
-		list_for_each_entry(nte, base->tv1.vec + slot, entry) {
-			if (tbase_get_deferrable(nte->base))
-				continue;
-
-			found = 1;
-			expires = nte->expires;
-			/* Look at the cascade bucket(s)? */
-			if (!index || slot < index)
-				goto cascade;
-			return expires;
-		}
-		slot = (slot + 1) & TVR_MASK;
-	} while (slot != index);
-
-cascade:
-	/* Calculate the next cascade event */
-	if (index)
-		timer_jiffies += TVR_SIZE - index;
-	timer_jiffies >>= TVR_BITS;
-
-	/* Check tv2-tv5. */
-	varray[0] = &base->tv2;
-	varray[1] = &base->tv3;
-	varray[2] = &base->tv4;
-	varray[3] = &base->tv5;
-
-	for (array = 0; array < 4; array++) {
-		struct tvec *varp = varray[array];
-
-		index = slot = timer_jiffies & TVN_MASK;
-		do {
-			list_for_each_entry(nte, varp->vec + slot, entry) {
-				if (tbase_get_deferrable(nte->base))
-					continue;
-
-				found = 1;
-				if (time_before(nte->expires, expires))
-					expires = nte->expires;
-			}
-			/*
-			 * Do we still search for the first timer or are
-			 * we looking up the cascade buckets ?
-			 */
-			if (found) {
-				/* Look at the cascade bucket(s)? */
-				if (!index || slot < index)
-					break;
-				return expires;
-			}
-			slot = (slot + 1) & TVN_MASK;
-		} while (slot != index);
-
-		if (index)
-			timer_jiffies += TVN_SIZE - index;
-		timer_jiffies >>= TVN_BITS;
-	}
-	return expires;
-}
-
-/*
- * Check, if the next hrtimer event is before the next timer wheel
- * event:
- */
-static unsigned long cmp_next_hrtimer_event(unsigned long now,
-					    unsigned long expires)
-{
-	ktime_t hr_delta = hrtimer_get_next_event();
-	struct timespec tsdelta;
-	unsigned long delta;
-
-	if (hr_delta.tv64 == KTIME_MAX)
-		return expires;
-
-	/*
-	 * Expired timer available, let it expire in the next tick
-	 */
-	if (hr_delta.tv64 <= 0)
-		return now + 1;
-
-	tsdelta = ktime_to_timespec(hr_delta);
-	delta = timespec_to_jiffies(&tsdelta);
-
-	/*
-	 * Limit the delta to the max value, which is checked in
-	 * tick_nohz_stop_sched_tick():
-	 */
-	if (delta > NEXT_TIMER_MAX_DELTA)
-		delta = NEXT_TIMER_MAX_DELTA;
-
-	/*
-	 * Take rounding errors in to account and make sure, that it
-	 * expires in the next tick. Otherwise we go into an endless
-	 * ping pong due to tick_nohz_stop_sched_tick() retriggering
-	 * the timer softirq
-	 */
-	if (delta < 1)
-		delta = 1;
-	now += delta;
-	if (time_before(now, expires))
-		return now;
-	return expires;
-}
-
-/**
- * get_next_timer_interrupt - return the jiffy of the next pending timer
- * @now: current time (in jiffies)
- */
-unsigned long get_next_timer_interrupt(unsigned long now)
-{
-	struct tvec_base *base = __this_cpu_read(tvec_bases);
-	unsigned long expires = now + NEXT_TIMER_MAX_DELTA;
-
-	/*
-	 * Pretend that there is no timer pending if the cpu is offline.
-	 * Possible pending timers will be migrated later to an active cpu.
-	 */
-	if (cpu_is_offline(smp_processor_id()))
-		return expires;
-
-	spin_lock(&base->lock);
-	if (base->active_timers) {
-		if (time_before_eq(base->next_timer, base->timer_jiffies))
-			base->next_timer = __next_timer_interrupt(base);
-		expires = base->next_timer;
-	}
-	spin_unlock(&base->lock);
-
-	if (time_before_eq(expires, now))
-		return now;
-
-	return cmp_next_hrtimer_event(now, expires);
-}
-#endif
-
-/*
- * Called from the timer interrupt handler to charge one tick to the current
- * process.  user_tick is 1 if the tick is user time, 0 for system.
- */
-void update_process_times(int user_tick)
-{
-	struct task_struct *p = current;
-	int cpu = smp_processor_id();
-
-	/* Note: this timer irq context must be accounted for as well. */
-	account_process_tick(p, user_tick);
-	run_local_timers();
-	rcu_check_callbacks(cpu, user_tick);
-#ifdef CONFIG_IRQ_WORK
-	if (in_irq())
-		irq_work_run();
-#endif
-	scheduler_tick();
-	run_posix_cpu_timers(p);
-}
-
-/*
- * This function runs timers and the timer-tq in bottom half context.
- */
-static void run_timer_softirq(struct softirq_action *h)
-{
-	struct tvec_base *base = __this_cpu_read(tvec_bases);
-
-	hrtimer_run_pending();
-
-	if (time_after_eq(jiffies, base->timer_jiffies))
-		__run_timers(base);
-}
-
-/*
- * Called by the local, per-CPU timer interrupt on SMP.
- */
-void run_local_timers(void)
-{
-	hrtimer_run_queues();
-	raise_softirq(TIMER_SOFTIRQ);
-}
-
-#ifdef __ARCH_WANT_SYS_ALARM
-
-/*
- * For backwards compatibility?  This can be done in libc so Alpha
- * and all newer ports shouldn't need it.
- */
-SYSCALL_DEFINE1(alarm, unsigned int, seconds)
-{
-	return alarm_setitimer(seconds);
-}
-
-#endif
-
-static void process_timeout(unsigned long __data)
-{
-	wake_up_process((struct task_struct *)__data);
-}
-
-/**
- * schedule_timeout - sleep until timeout
- * @timeout: timeout value in jiffies
- *
- * Make the current task sleep until @timeout jiffies have
- * elapsed. The routine will return immediately unless
- * the current task state has been set (see set_current_state()).
- *
- * You can set the task state as follows -
- *
- * %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
- * pass before the routine returns. The routine will return 0
- *
- * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
- * delivered to the current task. In this case the remaining time
- * in jiffies will be returned, or 0 if the timer expired in time
- *
- * The current task state is guaranteed to be TASK_RUNNING when this
- * routine returns.
- *
- * Specifying a @timeout value of %MAX_SCHEDULE_TIMEOUT will schedule
- * the CPU away without a bound on the timeout. In this case the return
- * value will be %MAX_SCHEDULE_TIMEOUT.
- *
- * In all cases the return value is guaranteed to be non-negative.
- */
-signed long __sched schedule_timeout(signed long timeout)
-{
-	struct timer_list timer;
-	unsigned long expire;
-
-	switch (timeout)
-	{
-	case MAX_SCHEDULE_TIMEOUT:
-		/*
-		 * These two special cases are useful to be comfortable
-		 * in the caller. Nothing more. We could take
-		 * MAX_SCHEDULE_TIMEOUT from one of the negative value
-		 * but I' d like to return a valid offset (>=0) to allow
-		 * the caller to do everything it want with the retval.
-		 */
-		schedule();
-		goto out;
-	default:
-		/*
-		 * Another bit of PARANOID. Note that the retval will be
-		 * 0 since no piece of kernel is supposed to do a check
-		 * for a negative retval of schedule_timeout() (since it
-		 * should never happens anyway). You just have the printk()
-		 * that will tell you if something is gone wrong and where.
-		 */
-		if (timeout < 0) {
-			printk(KERN_ERR "schedule_timeout: wrong timeout "
-				"value %lx\n", timeout);
-			dump_stack();
-			current->state = TASK_RUNNING;
-			goto out;
-		}
-	}
-
-	expire = timeout + jiffies;
-
-	setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
-	__mod_timer(&timer, expire, false, TIMER_NOT_PINNED);
-	schedule();
-	del_singleshot_timer_sync(&timer);
-
-	/* Remove the timer from the object tracker */
-	destroy_timer_on_stack(&timer);
-
-	timeout = expire - jiffies;
-
- out:
-	return timeout < 0 ? 0 : timeout;
-}
-EXPORT_SYMBOL(schedule_timeout);
-
-/*
- * We can use __set_current_state() here because schedule_timeout() calls
- * schedule() unconditionally.
- */
-signed long __sched schedule_timeout_interruptible(signed long timeout)
-{
-	__set_current_state(TASK_INTERRUPTIBLE);
-	return schedule_timeout(timeout);
-}
-EXPORT_SYMBOL(schedule_timeout_interruptible);
-
-signed long __sched schedule_timeout_killable(signed long timeout)
-{
-	__set_current_state(TASK_KILLABLE);
-	return schedule_timeout(timeout);
-}
-EXPORT_SYMBOL(schedule_timeout_killable);
-
-signed long __sched schedule_timeout_uninterruptible(signed long timeout)
-{
-	__set_current_state(TASK_UNINTERRUPTIBLE);
-	return schedule_timeout(timeout);
-}
-EXPORT_SYMBOL(schedule_timeout_uninterruptible);
-
-static int init_timers_cpu(int cpu)
-{
-	int j;
-	struct tvec_base *base;
-	static char tvec_base_done[NR_CPUS];
-
-	if (!tvec_base_done[cpu]) {
-		static char boot_done;
-
-		if (boot_done) {
-			/*
-			 * The APs use this path later in boot
-			 */
-			base = kzalloc_node(sizeof(*base), GFP_KERNEL,
-					    cpu_to_node(cpu));
-			if (!base)
-				return -ENOMEM;
-
-			/* Make sure tvec_base has TIMER_FLAG_MASK bits free */
-			if (WARN_ON(base != tbase_get_base(base))) {
-				kfree(base);
-				return -ENOMEM;
-			}
-			per_cpu(tvec_bases, cpu) = base;
-		} else {
-			/*
-			 * This is for the boot CPU - we use compile-time
-			 * static initialisation because per-cpu memory isn't
-			 * ready yet and because the memory allocators are not
-			 * initialised either.
-			 */
-			boot_done = 1;
-			base = &boot_tvec_bases;
-		}
-		spin_lock_init(&base->lock);
-		tvec_base_done[cpu] = 1;
-	} else {
-		base = per_cpu(tvec_bases, cpu);
-	}
-
-
-	for (j = 0; j < TVN_SIZE; j++) {
-		INIT_LIST_HEAD(base->tv5.vec + j);
-		INIT_LIST_HEAD(base->tv4.vec + j);
-		INIT_LIST_HEAD(base->tv3.vec + j);
-		INIT_LIST_HEAD(base->tv2.vec + j);
-	}
-	for (j = 0; j < TVR_SIZE; j++)
-		INIT_LIST_HEAD(base->tv1.vec + j);
-
-	base->timer_jiffies = jiffies;
-	base->next_timer = base->timer_jiffies;
-	base->active_timers = 0;
-	base->all_timers = 0;
-	return 0;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-static void migrate_timer_list(struct tvec_base *new_base, struct list_head *head)
-{
-	struct timer_list *timer;
-
-	while (!list_empty(head)) {
-		timer = list_first_entry(head, struct timer_list, entry);
-		/* We ignore the accounting on the dying cpu */
-		detach_timer(timer, false);
-		timer_set_base(timer, new_base);
-		internal_add_timer(new_base, timer);
-	}
-}
-
-static void migrate_timers(int cpu)
-{
-	struct tvec_base *old_base;
-	struct tvec_base *new_base;
-	int i;
-
-	BUG_ON(cpu_online(cpu));
-	old_base = per_cpu(tvec_bases, cpu);
-	new_base = get_cpu_var(tvec_bases);
-	/*
-	 * The caller is globally serialized and nobody else
-	 * takes two locks at once, deadlock is not possible.
-	 */
-	spin_lock_irq(&new_base->lock);
-	spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
-
-	BUG_ON(old_base->running_timer);
-
-	for (i = 0; i < TVR_SIZE; i++)
-		migrate_timer_list(new_base, old_base->tv1.vec + i);
-	for (i = 0; i < TVN_SIZE; i++) {
-		migrate_timer_list(new_base, old_base->tv2.vec + i);
-		migrate_timer_list(new_base, old_base->tv3.vec + i);
-		migrate_timer_list(new_base, old_base->tv4.vec + i);
-		migrate_timer_list(new_base, old_base->tv5.vec + i);
-	}
-
-	spin_unlock(&old_base->lock);
-	spin_unlock_irq(&new_base->lock);
-	put_cpu_var(tvec_bases);
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-
-static int timer_cpu_notify(struct notifier_block *self,
-				unsigned long action, void *hcpu)
-{
-	long cpu = (long)hcpu;
-	int err;
-
-	switch(action) {
-	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
-		err = init_timers_cpu(cpu);
-		if (err < 0)
-			return notifier_from_errno(err);
-		break;
-#ifdef CONFIG_HOTPLUG_CPU
-	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
-		migrate_timers(cpu);
-		break;
-#endif
-	default:
-		break;
-	}
-	return NOTIFY_OK;
-}
-
-static struct notifier_block timers_nb = {
-	.notifier_call	= timer_cpu_notify,
-};
-
-
-void __init init_timers(void)
-{
-	int err;
-
-	/* ensure there are enough low bits for flags in timer->base pointer */
-	BUILD_BUG_ON(__alignof__(struct tvec_base) & TIMER_FLAG_MASK);
-
-	err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE,
-			       (void *)(long)smp_processor_id());
-	BUG_ON(err != NOTIFY_OK);
-
-	init_timer_stats();
-	register_cpu_notifier(&timers_nb);
-	open_softirq(TIMER_SOFTIRQ, run_timer_softirq);
-}
-
-/**
- * msleep - sleep safely even with waitqueue interruptions
- * @msecs: Time in milliseconds to sleep for
- */
-void msleep(unsigned int msecs)
-{
-	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
-
-	while (timeout)
-		timeout = schedule_timeout_uninterruptible(timeout);
-}
-
-EXPORT_SYMBOL(msleep);
-
-/**
- * msleep_interruptible - sleep waiting for signals
- * @msecs: Time in milliseconds to sleep for
- */
-unsigned long msleep_interruptible(unsigned int msecs)
-{
-	unsigned long timeout = msecs_to_jiffies(msecs) + 1;
-
-	while (timeout && !signal_pending(current))
-		timeout = schedule_timeout_interruptible(timeout);
-	return jiffies_to_msecs(timeout);
-}
-
-EXPORT_SYMBOL(msleep_interruptible);
-
-static int __sched do_usleep_range(unsigned long min, unsigned long max)
-{
-	ktime_t kmin;
-	unsigned long delta;
-
-	kmin = ktime_set(0, min * NSEC_PER_USEC);
-	delta = (max - min) * NSEC_PER_USEC;
-	return schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL);
-}
-
-/**
- * usleep_range - Drop in replacement for udelay where wakeup is flexible
- * @min: Minimum time in usecs to sleep
- * @max: Maximum time in usecs to sleep
- */
-void usleep_range(unsigned long min, unsigned long max)
-{
-	__set_current_state(TASK_UNINTERRUPTIBLE);
-	do_usleep_range(min, max);
-}
-EXPORT_SYMBOL(usleep_range);