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, 1490 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
deleted file mode 100644
index 3b8946416a5f..000000000000
--- a/kernel/posix-cpu-timers.c
+++ /dev/null
@@ -1,1490 +0,0 @@
-/*
- * Implement CPU time clocks for the POSIX clock interface.
- */
-
-#include <linux/sched.h>
-#include <linux/posix-timers.h>
-#include <linux/errno.h>
-#include <linux/math64.h>
-#include <asm/uaccess.h>
-#include <linux/kernel_stat.h>
-#include <trace/events/timer.h>
-#include <linux/random.h>
-#include <linux/tick.h>
-#include <linux/workqueue.h>
-
-/*
- * Called after updating RLIMIT_CPU to run cpu timer and update
- * tsk->signal->cputime_expires expiration cache if necessary. Needs
- * siglock protection since other code may update expiration cache as
- * well.
- */
-void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new)
-{
-	cputime_t cputime = secs_to_cputime(rlim_new);
-
-	spin_lock_irq(&task->sighand->siglock);
-	set_process_cpu_timer(task, CPUCLOCK_PROF, &cputime, NULL);
-	spin_unlock_irq(&task->sighand->siglock);
-}
-
-static int check_clock(const clockid_t which_clock)
-{
-	int error = 0;
-	struct task_struct *p;
-	const pid_t pid = CPUCLOCK_PID(which_clock);
-
-	if (CPUCLOCK_WHICH(which_clock) >= CPUCLOCK_MAX)
-		return -EINVAL;
-
-	if (pid == 0)
-		return 0;
-
-	rcu_read_lock();
-	p = find_task_by_vpid(pid);
-	if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
-		   same_thread_group(p, current) : has_group_leader_pid(p))) {
-		error = -EINVAL;
-	}
-	rcu_read_unlock();
-
-	return error;
-}
-
-static inline unsigned long long
-timespec_to_sample(const clockid_t which_clock, const struct timespec *tp)
-{
-	unsigned long long ret;
-
-	ret = 0;		/* high half always zero when .cpu used */
-	if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-		ret = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec;
-	} else {
-		ret = cputime_to_expires(timespec_to_cputime(tp));
-	}
-	return ret;
-}
-
-static void sample_to_timespec(const clockid_t which_clock,
-			       unsigned long long expires,
-			       struct timespec *tp)
-{
-	if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED)
-		*tp = ns_to_timespec(expires);
-	else
-		cputime_to_timespec((__force cputime_t)expires, tp);
-}
-
-/*
- * Update expiry time from increment, and increase overrun count,
- * given the current clock sample.
- */
-static void bump_cpu_timer(struct k_itimer *timer,
-			   unsigned long long now)
-{
-	int i;
-	unsigned long long delta, incr;
-
-	if (timer->it.cpu.incr == 0)
-		return;
-
-	if (now < timer->it.cpu.expires)
-		return;
-
-	incr = timer->it.cpu.incr;
-	delta = now + incr - timer->it.cpu.expires;
-
-	/* Don't use (incr*2 < delta), incr*2 might overflow. */
-	for (i = 0; incr < delta - incr; i++)
-		incr = incr << 1;
-
-	for (; i >= 0; incr >>= 1, i--) {
-		if (delta < incr)
-			continue;
-
-		timer->it.cpu.expires += incr;
-		timer->it_overrun += 1 << i;
-		delta -= incr;
-	}
-}
-
-/**
- * task_cputime_zero - Check a task_cputime struct for all zero fields.
- *
- * @cputime:	The struct to compare.
- *
- * Checks @cputime to see if all fields are zero.  Returns true if all fields
- * are zero, false if any field is nonzero.
- */
-static inline int task_cputime_zero(const struct task_cputime *cputime)
-{
-	if (!cputime->utime && !cputime->stime && !cputime->sum_exec_runtime)
-		return 1;
-	return 0;
-}
-
-static inline unsigned long long prof_ticks(struct task_struct *p)
-{
-	cputime_t utime, stime;
-
-	task_cputime(p, &utime, &stime);
-
-	return cputime_to_expires(utime + stime);
-}
-static inline unsigned long long virt_ticks(struct task_struct *p)
-{
-	cputime_t utime;
-
-	task_cputime(p, &utime, NULL);
-
-	return cputime_to_expires(utime);
-}
-
-static int
-posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
-{
-	int error = check_clock(which_clock);
-	if (!error) {
-		tp->tv_sec = 0;
-		tp->tv_nsec = ((NSEC_PER_SEC + HZ - 1) / HZ);
-		if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) {
-			/*
-			 * If sched_clock is using a cycle counter, we
-			 * don't have any idea of its true resolution
-			 * exported, but it is much more than 1s/HZ.
-			 */
-			tp->tv_nsec = 1;
-		}
-	}
-	return error;
-}
-
-static int
-posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp)
-{
-	/*
-	 * You can never reset a CPU clock, but we check for other errors
-	 * in the call before failing with EPERM.
-	 */
-	int error = check_clock(which_clock);
-	if (error == 0) {
-		error = -EPERM;
-	}
-	return error;
-}
-
-
-/*
- * Sample a per-thread clock for the given task.
- */
-static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
-			    unsigned long long *sample)
-{
-	switch (CPUCLOCK_WHICH(which_clock)) {
-	default:
-		return -EINVAL;
-	case CPUCLOCK_PROF:
-		*sample = prof_ticks(p);
-		break;
-	case CPUCLOCK_VIRT:
-		*sample = virt_ticks(p);
-		break;
-	case CPUCLOCK_SCHED:
-		*sample = task_sched_runtime(p);
-		break;
-	}
-	return 0;
-}
-
-static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b)
-{
-	if (b->utime > a->utime)
-		a->utime = b->utime;
-
-	if (b->stime > a->stime)
-		a->stime = b->stime;
-
-	if (b->sum_exec_runtime > a->sum_exec_runtime)
-		a->sum_exec_runtime = b->sum_exec_runtime;
-}
-
-void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
-{
-	struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
-	struct task_cputime sum;
-	unsigned long flags;
-
-	if (!cputimer->running) {
-		/*
-		 * The POSIX timer interface allows for absolute time expiry
-		 * values through the TIMER_ABSTIME flag, therefore we have
-		 * to synchronize the timer to the clock every time we start
-		 * it.
-		 */
-		thread_group_cputime(tsk, &sum);
-		raw_spin_lock_irqsave(&cputimer->lock, flags);
-		cputimer->running = 1;
-		update_gt_cputime(&cputimer->cputime, &sum);
-	} else
-		raw_spin_lock_irqsave(&cputimer->lock, flags);
-	*times = cputimer->cputime;
-	raw_spin_unlock_irqrestore(&cputimer->lock, flags);
-}
-
-/*
- * Sample a process (thread group) clock for the given group_leader task.
- * Must be called with task sighand lock held for safe while_each_thread()
- * traversal.
- */
-static int cpu_clock_sample_group(const clockid_t which_clock,
-				  struct task_struct *p,
-				  unsigned long long *sample)
-{
-	struct task_cputime cputime;
-
-	switch (CPUCLOCK_WHICH(which_clock)) {
-	default:
-		return -EINVAL;
-	case CPUCLOCK_PROF:
-		thread_group_cputime(p, &cputime);
-		*sample = cputime_to_expires(cputime.utime + cputime.stime);
-		break;
-	case CPUCLOCK_VIRT:
-		thread_group_cputime(p, &cputime);
-		*sample = cputime_to_expires(cputime.utime);
-		break;
-	case CPUCLOCK_SCHED:
-		thread_group_cputime(p, &cputime);
-		*sample = cputime.sum_exec_runtime;
-		break;
-	}
-	return 0;
-}
-
-static int posix_cpu_clock_get_task(struct task_struct *tsk,
-				    const clockid_t which_clock,
-				    struct timespec *tp)
-{
-	int err = -EINVAL;
-	unsigned long long rtn;
-
-	if (CPUCLOCK_PERTHREAD(which_clock)) {
-		if (same_thread_group(tsk, current))
-			err = cpu_clock_sample(which_clock, tsk, &rtn);
-	} else {
-		unsigned long flags;
-		struct sighand_struct *sighand;
-
-		/*
-		 * while_each_thread() is not yet entirely RCU safe,
-		 * keep locking the group while sampling process
-		 * clock for now.
-		 */
-		sighand = lock_task_sighand(tsk, &flags);
-		if (!sighand)
-			return err;
-
-		if (tsk == current || thread_group_leader(tsk))
-			err = cpu_clock_sample_group(which_clock, tsk, &rtn);
-
-		unlock_task_sighand(tsk, &flags);
-	}
-
-	if (!err)
-		sample_to_timespec(which_clock, rtn, tp);
-
-	return err;
-}
-
-
-static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
-{
-	const pid_t pid = CPUCLOCK_PID(which_clock);
-	int err = -EINVAL;
-
-	if (pid == 0) {
-		/*
-		 * Special case constant value for our own clocks.
-		 * We don't have to do any lookup to find ourselves.
-		 */
-		err = posix_cpu_clock_get_task(current, which_clock, tp);
-	} else {
-		/*
-		 * Find the given PID, and validate that the caller
-		 * should be able to see it.
-		 */
-		struct task_struct *p;
-		rcu_read_lock();
-		p = find_task_by_vpid(pid);
-		if (p)
-			err = posix_cpu_clock_get_task(p, which_clock, tp);
-		rcu_read_unlock();
-	}
-
-	return err;
-}
-
-
-/*
- * Validate the clockid_t for a new CPU-clock timer, and initialize the timer.
- * This is called from sys_timer_create() and do_cpu_nanosleep() with the
- * new timer already all-zeros initialized.
- */
-static int posix_cpu_timer_create(struct k_itimer *new_timer)
-{
-	int ret = 0;
-	const pid_t pid = CPUCLOCK_PID(new_timer->it_clock);
-	struct task_struct *p;
-
-	if (CPUCLOCK_WHICH(new_timer->it_clock) >= CPUCLOCK_MAX)
-		return -EINVAL;
-
-	INIT_LIST_HEAD(&new_timer->it.cpu.entry);
-
-	rcu_read_lock();
-	if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) {
-		if (pid == 0) {
-			p = current;
-		} else {
-			p = find_task_by_vpid(pid);
-			if (p && !same_thread_group(p, current))
-				p = NULL;
-		}
-	} else {
-		if (pid == 0) {
-			p = current->group_leader;
-		} else {
-			p = find_task_by_vpid(pid);
-			if (p && !has_group_leader_pid(p))
-				p = NULL;
-		}
-	}
-	new_timer->it.cpu.task = p;
-	if (p) {
-		get_task_struct(p);
-	} else {
-		ret = -EINVAL;
-	}
-	rcu_read_unlock();
-
-	return ret;
-}
-
-/*
- * Clean up a CPU-clock timer that is about to be destroyed.
- * This is called from timer deletion with the timer already locked.
- * If we return TIMER_RETRY, it's necessary to release the timer's lock
- * and try again.  (This happens when the timer is in the middle of firing.)
- */
-static int posix_cpu_timer_del(struct k_itimer *timer)
-{
-	int ret = 0;
-	unsigned long flags;
-	struct sighand_struct *sighand;
-	struct task_struct *p = timer->it.cpu.task;
-
-	WARN_ON_ONCE(p == NULL);
-
-	/*
-	 * Protect against sighand release/switch in exit/exec and process/
-	 * thread timer list entry concurrent read/writes.
-	 */
-	sighand = lock_task_sighand(p, &flags);
-	if (unlikely(sighand == NULL)) {
-		/*
-		 * We raced with the reaping of the task.
-		 * The deletion should have cleared us off the list.
-		 */
-		WARN_ON_ONCE(!list_empty(&timer->it.cpu.entry));
-	} else {
-		if (timer->it.cpu.firing)
-			ret = TIMER_RETRY;
-		else
-			list_del(&timer->it.cpu.entry);
-
-		unlock_task_sighand(p, &flags);
-	}
-
-	if (!ret)
-		put_task_struct(p);
-
-	return ret;
-}
-
-static void cleanup_timers_list(struct list_head *head)
-{
-	struct cpu_timer_list *timer, *next;
-
-	list_for_each_entry_safe(timer, next, head, entry)
-		list_del_init(&timer->entry);
-}
-
-/*
- * Clean out CPU timers still ticking when a thread exited.  The task
- * pointer is cleared, and the expiry time is replaced with the residual
- * time for later timer_gettime calls to return.
- * This must be called with the siglock held.
- */
-static void cleanup_timers(struct list_head *head)
-{
-	cleanup_timers_list(head);
-	cleanup_timers_list(++head);
-	cleanup_timers_list(++head);
-}
-
-/*
- * These are both called with the siglock held, when the current thread
- * is being reaped.  When the final (leader) thread in the group is reaped,
- * posix_cpu_timers_exit_group will be called after posix_cpu_timers_exit.
- */
-void posix_cpu_timers_exit(struct task_struct *tsk)
-{
-	add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
-						sizeof(unsigned long long));
-	cleanup_timers(tsk->cpu_timers);
-
-}
-void posix_cpu_timers_exit_group(struct task_struct *tsk)
-{
-	cleanup_timers(tsk->signal->cpu_timers);
-}
-
-static inline int expires_gt(cputime_t expires, cputime_t new_exp)
-{
-	return expires == 0 || expires > new_exp;
-}
-
-/*
- * Insert the timer on the appropriate list before any timers that
- * expire later.  This must be called with the sighand lock held.
- */
-static void arm_timer(struct k_itimer *timer)
-{
-	struct task_struct *p = timer->it.cpu.task;
-	struct list_head *head, *listpos;
-	struct task_cputime *cputime_expires;
-	struct cpu_timer_list *const nt = &timer->it.cpu;
-	struct cpu_timer_list *next;
-
-	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-		head = p->cpu_timers;
-		cputime_expires = &p->cputime_expires;
-	} else {
-		head = p->signal->cpu_timers;
-		cputime_expires = &p->signal->cputime_expires;
-	}
-	head += CPUCLOCK_WHICH(timer->it_clock);
-
-	listpos = head;
-	list_for_each_entry(next, head, entry) {
-		if (nt->expires < next->expires)
-			break;
-		listpos = &next->entry;
-	}
-	list_add(&nt->entry, listpos);
-
-	if (listpos == head) {
-		unsigned long long exp = nt->expires;
-
-		/*
-		 * We are the new earliest-expiring POSIX 1.b timer, hence
-		 * need to update expiration cache. Take into account that
-		 * for process timers we share expiration cache with itimers
-		 * and RLIMIT_CPU and for thread timers with RLIMIT_RTTIME.
-		 */
-
-		switch (CPUCLOCK_WHICH(timer->it_clock)) {
-		case CPUCLOCK_PROF:
-			if (expires_gt(cputime_expires->prof_exp, expires_to_cputime(exp)))
-				cputime_expires->prof_exp = expires_to_cputime(exp);
-			break;
-		case CPUCLOCK_VIRT:
-			if (expires_gt(cputime_expires->virt_exp, expires_to_cputime(exp)))
-				cputime_expires->virt_exp = expires_to_cputime(exp);
-			break;
-		case CPUCLOCK_SCHED:
-			if (cputime_expires->sched_exp == 0 ||
-			    cputime_expires->sched_exp > exp)
-				cputime_expires->sched_exp = exp;
-			break;
-		}
-	}
-}
-
-/*
- * The timer is locked, fire it and arrange for its reload.
- */
-static void cpu_timer_fire(struct k_itimer *timer)
-{
-	if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {
-		/*
-		 * User don't want any signal.
-		 */
-		timer->it.cpu.expires = 0;
-	} else if (unlikely(timer->sigq == NULL)) {
-		/*
-		 * This a special case for clock_nanosleep,
-		 * not a normal timer from sys_timer_create.
-		 */
-		wake_up_process(timer->it_process);
-		timer->it.cpu.expires = 0;
-	} else if (timer->it.cpu.incr == 0) {
-		/*
-		 * One-shot timer.  Clear it as soon as it's fired.
-		 */
-		posix_timer_event(timer, 0);
-		timer->it.cpu.expires = 0;
-	} else if (posix_timer_event(timer, ++timer->it_requeue_pending)) {
-		/*
-		 * The signal did not get queued because the signal
-		 * was ignored, so we won't get any callback to
-		 * reload the timer.  But we need to keep it
-		 * ticking in case the signal is deliverable next time.
-		 */
-		posix_cpu_timer_schedule(timer);
-	}
-}
-
-/*
- * Sample a process (thread group) timer for the given group_leader task.
- * Must be called with task sighand lock held for safe while_each_thread()
- * traversal.
- */
-static int cpu_timer_sample_group(const clockid_t which_clock,
-				  struct task_struct *p,
-				  unsigned long long *sample)
-{
-	struct task_cputime cputime;
-
-	thread_group_cputimer(p, &cputime);
-	switch (CPUCLOCK_WHICH(which_clock)) {
-	default:
-		return -EINVAL;
-	case CPUCLOCK_PROF:
-		*sample = cputime_to_expires(cputime.utime + cputime.stime);
-		break;
-	case CPUCLOCK_VIRT:
-		*sample = cputime_to_expires(cputime.utime);
-		break;
-	case CPUCLOCK_SCHED:
-		*sample = cputime.sum_exec_runtime + task_delta_exec(p);
-		break;
-	}
-	return 0;
-}
-
-#ifdef CONFIG_NO_HZ_FULL
-static void nohz_kick_work_fn(struct work_struct *work)
-{
-	tick_nohz_full_kick_all();
-}
-
-static DECLARE_WORK(nohz_kick_work, nohz_kick_work_fn);
-
-/*
- * We need the IPIs to be sent from sane process context.
- * The posix cpu timers are always set with irqs disabled.
- */
-static void posix_cpu_timer_kick_nohz(void)
-{
-	if (context_tracking_is_enabled())
-		schedule_work(&nohz_kick_work);
-}
-
-bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk)
-{
-	if (!task_cputime_zero(&tsk->cputime_expires))
-		return false;
-
-	if (tsk->signal->cputimer.running)
-		return false;
-
-	return true;
-}
-#else
-static inline void posix_cpu_timer_kick_nohz(void) { }
-#endif
-
-/*
- * Guts of sys_timer_settime for CPU timers.
- * This is called with the timer locked and interrupts disabled.
- * If we return TIMER_RETRY, it's necessary to release the timer's lock
- * and try again.  (This happens when the timer is in the middle of firing.)
- */
-static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
-			       struct itimerspec *new, struct itimerspec *old)
-{
-	unsigned long flags;
-	struct sighand_struct *sighand;
-	struct task_struct *p = timer->it.cpu.task;
-	unsigned long long old_expires, new_expires, old_incr, val;
-	int ret;
-
-	WARN_ON_ONCE(p == NULL);
-
-	new_expires = timespec_to_sample(timer->it_clock, &new->it_value);
-
-	/*
-	 * Protect against sighand release/switch in exit/exec and p->cpu_timers
-	 * and p->signal->cpu_timers read/write in arm_timer()
-	 */
-	sighand = lock_task_sighand(p, &flags);
-	/*
-	 * If p has just been reaped, we can no
-	 * longer get any information about it at all.
-	 */
-	if (unlikely(sighand == NULL)) {
-		return -ESRCH;
-	}
-
-	/*
-	 * Disarm any old timer after extracting its expiry time.
-	 */
-	WARN_ON_ONCE(!irqs_disabled());
-
-	ret = 0;
-	old_incr = timer->it.cpu.incr;
-	old_expires = timer->it.cpu.expires;
-	if (unlikely(timer->it.cpu.firing)) {
-		timer->it.cpu.firing = -1;
-		ret = TIMER_RETRY;
-	} else
-		list_del_init(&timer->it.cpu.entry);
-
-	/*
-	 * We need to sample the current value to convert the new
-	 * value from to relative and absolute, and to convert the
-	 * old value from absolute to relative.  To set a process
-	 * timer, we need a sample to balance the thread expiry
-	 * times (in arm_timer).  With an absolute time, we must
-	 * check if it's already passed.  In short, we need a sample.
-	 */
-	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-		cpu_clock_sample(timer->it_clock, p, &val);
-	} else {
-		cpu_timer_sample_group(timer->it_clock, p, &val);
-	}
-
-	if (old) {
-		if (old_expires == 0) {
-			old->it_value.tv_sec = 0;
-			old->it_value.tv_nsec = 0;
-		} else {
-			/*
-			 * Update the timer in case it has
-			 * overrun already.  If it has,
-			 * we'll report it as having overrun
-			 * and with the next reloaded timer
-			 * already ticking, though we are
-			 * swallowing that pending
-			 * notification here to install the
-			 * new setting.
-			 */
-			bump_cpu_timer(timer, val);
-			if (val < timer->it.cpu.expires) {
-				old_expires = timer->it.cpu.expires - val;
-				sample_to_timespec(timer->it_clock,
-						   old_expires,
-						   &old->it_value);
-			} else {
-				old->it_value.tv_nsec = 1;
-				old->it_value.tv_sec = 0;
-			}
-		}
-	}
-
-	if (unlikely(ret)) {
-		/*
-		 * We are colliding with the timer actually firing.
-		 * Punt after filling in the timer's old value, and
-		 * disable this firing since we are already reporting
-		 * it as an overrun (thanks to bump_cpu_timer above).
-		 */
-		unlock_task_sighand(p, &flags);
-		goto out;
-	}
-
-	if (new_expires != 0 && !(timer_flags & TIMER_ABSTIME)) {
-		new_expires += val;
-	}
-
-	/*
-	 * Install the new expiry time (or zero).
-	 * For a timer with no notification action, we don't actually
-	 * arm the timer (we'll just fake it for timer_gettime).
-	 */
-	timer->it.cpu.expires = new_expires;
-	if (new_expires != 0 && val < new_expires) {
-		arm_timer(timer);
-	}
-
-	unlock_task_sighand(p, &flags);
-	/*
-	 * Install the new reload setting, and
-	 * set up the signal and overrun bookkeeping.
-	 */
-	timer->it.cpu.incr = timespec_to_sample(timer->it_clock,
-						&new->it_interval);
-
-	/*
-	 * This acts as a modification timestamp for the timer,
-	 * so any automatic reload attempt will punt on seeing
-	 * that we have reset the timer manually.
-	 */
-	timer->it_requeue_pending = (timer->it_requeue_pending + 2) &
-		~REQUEUE_PENDING;
-	timer->it_overrun_last = 0;
-	timer->it_overrun = -1;
-
-	if (new_expires != 0 && !(val < new_expires)) {
-		/*
-		 * The designated time already passed, so we notify
-		 * immediately, even if the thread never runs to
-		 * accumulate more time on this clock.
-		 */
-		cpu_timer_fire(timer);
-	}
-
-	ret = 0;
- out:
-	if (old) {
-		sample_to_timespec(timer->it_clock,
-				   old_incr, &old->it_interval);
-	}
-	if (!ret)
-		posix_cpu_timer_kick_nohz();
-	return ret;
-}
-
-static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
-{
-	unsigned long long now;
-	struct task_struct *p = timer->it.cpu.task;
-
-	WARN_ON_ONCE(p == NULL);
-
-	/*
-	 * Easy part: convert the reload time.
-	 */
-	sample_to_timespec(timer->it_clock,
-			   timer->it.cpu.incr, &itp->it_interval);
-
-	if (timer->it.cpu.expires == 0) {	/* Timer not armed at all.  */
-		itp->it_value.tv_sec = itp->it_value.tv_nsec = 0;
-		return;
-	}
-
-	/*
-	 * Sample the clock to take the difference with the expiry time.
-	 */
-	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-		cpu_clock_sample(timer->it_clock, p, &now);
-	} else {
-		struct sighand_struct *sighand;
-		unsigned long flags;
-
-		/*
-		 * Protect against sighand release/switch in exit/exec and
-		 * also make timer sampling safe if it ends up calling
-		 * thread_group_cputime().
-		 */
-		sighand = lock_task_sighand(p, &flags);
-		if (unlikely(sighand == NULL)) {
-			/*
-			 * The process has been reaped.
-			 * We can't even collect a sample any more.
-			 * Call the timer disarmed, nothing else to do.
-			 */
-			timer->it.cpu.expires = 0;
-			sample_to_timespec(timer->it_clock, timer->it.cpu.expires,
-					   &itp->it_value);
-		} else {
-			cpu_timer_sample_group(timer->it_clock, p, &now);
-			unlock_task_sighand(p, &flags);
-		}
-	}
-
-	if (now < timer->it.cpu.expires) {
-		sample_to_timespec(timer->it_clock,
-				   timer->it.cpu.expires - now,
-				   &itp->it_value);
-	} else {
-		/*
-		 * The timer should have expired already, but the firing
-		 * hasn't taken place yet.  Say it's just about to expire.
-		 */
-		itp->it_value.tv_nsec = 1;
-		itp->it_value.tv_sec = 0;
-	}
-}
-
-static unsigned long long
-check_timers_list(struct list_head *timers,
-		  struct list_head *firing,
-		  unsigned long long curr)
-{
-	int maxfire = 20;
-
-	while (!list_empty(timers)) {
-		struct cpu_timer_list *t;
-
-		t = list_first_entry(timers, struct cpu_timer_list, entry);
-
-		if (!--maxfire || curr < t->expires)
-			return t->expires;
-
-		t->firing = 1;
-		list_move_tail(&t->entry, firing);
-	}
-
-	return 0;
-}
-
-/*
- * Check for any per-thread CPU timers that have fired and move them off
- * the tsk->cpu_timers[N] list onto the firing list.  Here we update the
- * tsk->it_*_expires values to reflect the remaining thread CPU timers.
- */
-static void check_thread_timers(struct task_struct *tsk,
-				struct list_head *firing)
-{
-	struct list_head *timers = tsk->cpu_timers;
-	struct signal_struct *const sig = tsk->signal;
-	struct task_cputime *tsk_expires = &tsk->cputime_expires;
-	unsigned long long expires;
-	unsigned long soft;
-
-	expires = check_timers_list(timers, firing, prof_ticks(tsk));
-	tsk_expires->prof_exp = expires_to_cputime(expires);
-
-	expires = check_timers_list(++timers, firing, virt_ticks(tsk));
-	tsk_expires->virt_exp = expires_to_cputime(expires);
-
-	tsk_expires->sched_exp = check_timers_list(++timers, firing,
-						   tsk->se.sum_exec_runtime);
-
-	/*
-	 * Check for the special case thread timers.
-	 */
-	soft = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur);
-	if (soft != RLIM_INFINITY) {
-		unsigned long hard =
-			ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max);
-
-		if (hard != RLIM_INFINITY &&
-		    tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
-			/*
-			 * At the hard limit, we just die.
-			 * No need to calculate anything else now.
-			 */
-			__group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
-			return;
-		}
-		if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) {
-			/*
-			 * At the soft limit, send a SIGXCPU every second.
-			 */
-			if (soft < hard) {
-				soft += USEC_PER_SEC;
-				sig->rlim[RLIMIT_RTTIME].rlim_cur = soft;
-			}
-			printk(KERN_INFO
-				"RT Watchdog Timeout: %s[%d]\n",
-				tsk->comm, task_pid_nr(tsk));
-			__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
-		}
-	}
-}
-
-static void stop_process_timers(struct signal_struct *sig)
-{
-	struct thread_group_cputimer *cputimer = &sig->cputimer;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&cputimer->lock, flags);
-	cputimer->running = 0;
-	raw_spin_unlock_irqrestore(&cputimer->lock, flags);
-}
-
-static u32 onecputick;
-
-static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it,
-			     unsigned long long *expires,
-			     unsigned long long cur_time, int signo)
-{
-	if (!it->expires)
-		return;
-
-	if (cur_time >= it->expires) {
-		if (it->incr) {
-			it->expires += it->incr;
-			it->error += it->incr_error;
-			if (it->error >= onecputick) {
-				it->expires -= cputime_one_jiffy;
-				it->error -= onecputick;
-			}
-		} else {
-			it->expires = 0;
-		}
-
-		trace_itimer_expire(signo == SIGPROF ?
-				    ITIMER_PROF : ITIMER_VIRTUAL,
-				    tsk->signal->leader_pid, cur_time);
-		__group_send_sig_info(signo, SEND_SIG_PRIV, tsk);
-	}
-
-	if (it->expires && (!*expires || it->expires < *expires)) {
-		*expires = it->expires;
-	}
-}
-
-/*
- * Check for any per-thread CPU timers that have fired and move them
- * off the tsk->*_timers list onto the firing list.  Per-thread timers
- * have already been taken off.
- */
-static void check_process_timers(struct task_struct *tsk,
-				 struct list_head *firing)
-{
-	struct signal_struct *const sig = tsk->signal;
-	unsigned long long utime, ptime, virt_expires, prof_expires;
-	unsigned long long sum_sched_runtime, sched_expires;
-	struct list_head *timers = sig->cpu_timers;
-	struct task_cputime cputime;
-	unsigned long soft;
-
-	/*
-	 * Collect the current process totals.
-	 */
-	thread_group_cputimer(tsk, &cputime);
-	utime = cputime_to_expires(cputime.utime);
-	ptime = utime + cputime_to_expires(cputime.stime);
-	sum_sched_runtime = cputime.sum_exec_runtime;
-
-	prof_expires = check_timers_list(timers, firing, ptime);
-	virt_expires = check_timers_list(++timers, firing, utime);
-	sched_expires = check_timers_list(++timers, firing, sum_sched_runtime);
-
-	/*
-	 * Check for the special case process timers.
-	 */
-	check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_expires, ptime,
-			 SIGPROF);
-	check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime,
-			 SIGVTALRM);
-	soft = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
-	if (soft != RLIM_INFINITY) {
-		unsigned long psecs = cputime_to_secs(ptime);
-		unsigned long hard =
-			ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_max);
-		cputime_t x;
-		if (psecs >= hard) {
-			/*
-			 * At the hard limit, we just die.
-			 * No need to calculate anything else now.
-			 */
-			__group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
-			return;
-		}
-		if (psecs >= soft) {
-			/*
-			 * At the soft limit, send a SIGXCPU every second.
-			 */
-			__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk);
-			if (soft < hard) {
-				soft++;
-				sig->rlim[RLIMIT_CPU].rlim_cur = soft;
-			}
-		}
-		x = secs_to_cputime(soft);
-		if (!prof_expires || x < prof_expires) {
-			prof_expires = x;
-		}
-	}
-
-	sig->cputime_expires.prof_exp = expires_to_cputime(prof_expires);
-	sig->cputime_expires.virt_exp = expires_to_cputime(virt_expires);
-	sig->cputime_expires.sched_exp = sched_expires;
-	if (task_cputime_zero(&sig->cputime_expires))
-		stop_process_timers(sig);
-}
-
-/*
- * This is called from the signal code (via do_schedule_next_timer)
- * when the last timer signal was delivered and we have to reload the timer.
- */
-void posix_cpu_timer_schedule(struct k_itimer *timer)
-{
-	struct sighand_struct *sighand;
-	unsigned long flags;
-	struct task_struct *p = timer->it.cpu.task;
-	unsigned long long now;
-
-	WARN_ON_ONCE(p == NULL);
-
-	/*
-	 * Fetch the current sample and update the timer's expiry time.
-	 */
-	if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
-		cpu_clock_sample(timer->it_clock, p, &now);
-		bump_cpu_timer(timer, now);
-		if (unlikely(p->exit_state))
-			goto out;
-
-		/* Protect timer list r/w in arm_timer() */
-		sighand = lock_task_sighand(p, &flags);
-		if (!sighand)
-			goto out;
-	} else {
-		/*
-		 * Protect arm_timer() and timer sampling in case of call to
-		 * thread_group_cputime().
-		 */
-		sighand = lock_task_sighand(p, &flags);
-		if (unlikely(sighand == NULL)) {
-			/*
-			 * The process has been reaped.
-			 * We can't even collect a sample any more.
-			 */
-			timer->it.cpu.expires = 0;
-			goto out;
-		} else if (unlikely(p->exit_state) && thread_group_empty(p)) {
-			unlock_task_sighand(p, &flags);
-			/* Optimizations: if the process is dying, no need to rearm */
-			goto out;
-		}
-		cpu_timer_sample_group(timer->it_clock, p, &now);
-		bump_cpu_timer(timer, now);
-		/* Leave the sighand locked for the call below.  */
-	}
-
-	/*
-	 * Now re-arm for the new expiry time.
-	 */
-	WARN_ON_ONCE(!irqs_disabled());
-	arm_timer(timer);
-	unlock_task_sighand(p, &flags);
-
-	/* Kick full dynticks CPUs in case they need to tick on the new timer */
-	posix_cpu_timer_kick_nohz();
-out:
-	timer->it_overrun_last = timer->it_overrun;
-	timer->it_overrun = -1;
-	++timer->it_requeue_pending;
-}
-
-/**
- * task_cputime_expired - Compare two task_cputime entities.
- *
- * @sample:	The task_cputime structure to be checked for expiration.
- * @expires:	Expiration times, against which @sample will be checked.
- *
- * Checks @sample against @expires to see if any field of @sample has expired.
- * Returns true if any field of the former is greater than the corresponding
- * field of the latter if the latter field is set.  Otherwise returns false.
- */
-static inline int task_cputime_expired(const struct task_cputime *sample,
-					const struct task_cputime *expires)
-{
-	if (expires->utime && sample->utime >= expires->utime)
-		return 1;
-	if (expires->stime && sample->utime + sample->stime >= expires->stime)
-		return 1;
-	if (expires->sum_exec_runtime != 0 &&
-	    sample->sum_exec_runtime >= expires->sum_exec_runtime)
-		return 1;
-	return 0;
-}
-
-/**
- * fastpath_timer_check - POSIX CPU timers fast path.
- *
- * @tsk:	The task (thread) being checked.
- *
- * Check the task and thread group timers.  If both are zero (there are no
- * timers set) return false.  Otherwise snapshot the task and thread group
- * timers and compare them with the corresponding expiration times.  Return
- * true if a timer has expired, else return false.
- */
-static inline int fastpath_timer_check(struct task_struct *tsk)
-{
-	struct signal_struct *sig;
-	cputime_t utime, stime;
-
-	task_cputime(tsk, &utime, &stime);
-
-	if (!task_cputime_zero(&tsk->cputime_expires)) {
-		struct task_cputime task_sample = {
-			.utime = utime,
-			.stime = stime,
-			.sum_exec_runtime = tsk->se.sum_exec_runtime
-		};
-
-		if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
-			return 1;
-	}
-
-	sig = tsk->signal;
-	if (sig->cputimer.running) {
-		struct task_cputime group_sample;
-
-		raw_spin_lock(&sig->cputimer.lock);
-		group_sample = sig->cputimer.cputime;
-		raw_spin_unlock(&sig->cputimer.lock);
-
-		if (task_cputime_expired(&group_sample, &sig->cputime_expires))
-			return 1;
-	}
-
-	return 0;
-}
-
-/*
- * This is called from the timer interrupt handler.  The irq handler has
- * already updated our counts.  We need to check if any timers fire now.
- * Interrupts are disabled.
- */
-void run_posix_cpu_timers(struct task_struct *tsk)
-{
-	LIST_HEAD(firing);
-	struct k_itimer *timer, *next;
-	unsigned long flags;
-
-	WARN_ON_ONCE(!irqs_disabled());
-
-	/*
-	 * The fast path checks that there are no expired thread or thread
-	 * group timers.  If that's so, just return.
-	 */
-	if (!fastpath_timer_check(tsk))
-		return;
-
-	if (!lock_task_sighand(tsk, &flags))
-		return;
-	/*
-	 * Here we take off tsk->signal->cpu_timers[N] and
-	 * tsk->cpu_timers[N] all the timers that are firing, and
-	 * put them on the firing list.
-	 */
-	check_thread_timers(tsk, &firing);
-	/*
-	 * If there are any active process wide timers (POSIX 1.b, itimers,
-	 * RLIMIT_CPU) cputimer must be running.
-	 */
-	if (tsk->signal->cputimer.running)
-		check_process_timers(tsk, &firing);
-
-	/*
-	 * We must release these locks before taking any timer's lock.
-	 * There is a potential race with timer deletion here, as the
-	 * siglock now protects our private firing list.  We have set
-	 * the firing flag in each timer, so that a deletion attempt
-	 * that gets the timer lock before we do will give it up and
-	 * spin until we've taken care of that timer below.
-	 */
-	unlock_task_sighand(tsk, &flags);
-
-	/*
-	 * Now that all the timers on our list have the firing flag,
-	 * no one will touch their list entries but us.  We'll take
-	 * each timer's lock before clearing its firing flag, so no
-	 * timer call will interfere.
-	 */
-	list_for_each_entry_safe(timer, next, &firing, it.cpu.entry) {
-		int cpu_firing;
-
-		spin_lock(&timer->it_lock);
-		list_del_init(&timer->it.cpu.entry);
-		cpu_firing = timer->it.cpu.firing;
-		timer->it.cpu.firing = 0;
-		/*
-		 * The firing flag is -1 if we collided with a reset
-		 * of the timer, which already reported this
-		 * almost-firing as an overrun.  So don't generate an event.
-		 */
-		if (likely(cpu_firing >= 0))
-			cpu_timer_fire(timer);
-		spin_unlock(&timer->it_lock);
-	}
-}
-
-/*
- * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
- * The tsk->sighand->siglock must be held by the caller.
- */
-void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
-			   cputime_t *newval, cputime_t *oldval)
-{
-	unsigned long long now;
-
-	WARN_ON_ONCE(clock_idx == CPUCLOCK_SCHED);
-	cpu_timer_sample_group(clock_idx, tsk, &now);
-
-	if (oldval) {
-		/*
-		 * We are setting itimer. The *oldval is absolute and we update
-		 * it to be relative, *newval argument is relative and we update
-		 * it to be absolute.
-		 */
-		if (*oldval) {
-			if (*oldval <= now) {
-				/* Just about to fire. */
-				*oldval = cputime_one_jiffy;
-			} else {
-				*oldval -= now;
-			}
-		}
-
-		if (!*newval)
-			goto out;
-		*newval += now;
-	}
-
-	/*
-	 * Update expiration cache if we are the earliest timer, or eventually
-	 * RLIMIT_CPU limit is earlier than prof_exp cpu timer expire.
-	 */
-	switch (clock_idx) {
-	case CPUCLOCK_PROF:
-		if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval))
-			tsk->signal->cputime_expires.prof_exp = *newval;
-		break;
-	case CPUCLOCK_VIRT:
-		if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval))
-			tsk->signal->cputime_expires.virt_exp = *newval;
-		break;
-	}
-out:
-	posix_cpu_timer_kick_nohz();
-}
-
-static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
-			    struct timespec *rqtp, struct itimerspec *it)
-{
-	struct k_itimer timer;
-	int error;
-
-	/*
-	 * Set up a temporary timer and then wait for it to go off.
-	 */
-	memset(&timer, 0, sizeof timer);
-	spin_lock_init(&timer.it_lock);
-	timer.it_clock = which_clock;
-	timer.it_overrun = -1;
-	error = posix_cpu_timer_create(&timer);
-	timer.it_process = current;
-	if (!error) {
-		static struct itimerspec zero_it;
-
-		memset(it, 0, sizeof *it);
-		it->it_value = *rqtp;
-
-		spin_lock_irq(&timer.it_lock);
-		error = posix_cpu_timer_set(&timer, flags, it, NULL);
-		if (error) {
-			spin_unlock_irq(&timer.it_lock);
-			return error;
-		}
-
-		while (!signal_pending(current)) {
-			if (timer.it.cpu.expires == 0) {
-				/*
-				 * Our timer fired and was reset, below
-				 * deletion can not fail.
-				 */
-				posix_cpu_timer_del(&timer);
-				spin_unlock_irq(&timer.it_lock);
-				return 0;
-			}
-
-			/*
-			 * Block until cpu_timer_fire (or a signal) wakes us.
-			 */
-			__set_current_state(TASK_INTERRUPTIBLE);
-			spin_unlock_irq(&timer.it_lock);
-			schedule();
-			spin_lock_irq(&timer.it_lock);
-		}
-
-		/*
-		 * We were interrupted by a signal.
-		 */
-		sample_to_timespec(which_clock, timer.it.cpu.expires, rqtp);
-		error = posix_cpu_timer_set(&timer, 0, &zero_it, it);
-		if (!error) {
-			/*
-			 * Timer is now unarmed, deletion can not fail.
-			 */
-			posix_cpu_timer_del(&timer);
-		}
-		spin_unlock_irq(&timer.it_lock);
-
-		while (error == TIMER_RETRY) {
-			/*
-			 * We need to handle case when timer was or is in the
-			 * middle of firing. In other cases we already freed
-			 * resources.
-			 */
-			spin_lock_irq(&timer.it_lock);
-			error = posix_cpu_timer_del(&timer);
-			spin_unlock_irq(&timer.it_lock);
-		}
-
-		if ((it->it_value.tv_sec | it->it_value.tv_nsec) == 0) {
-			/*
-			 * It actually did fire already.
-			 */
-			return 0;
-		}
-
-		error = -ERESTART_RESTARTBLOCK;
-	}
-
-	return error;
-}
-
-static long posix_cpu_nsleep_restart(struct restart_block *restart_block);
-
-static int posix_cpu_nsleep(const clockid_t which_clock, int flags,
-			    struct timespec *rqtp, struct timespec __user *rmtp)
-{
-	struct restart_block *restart_block =
-		&current_thread_info()->restart_block;
-	struct itimerspec it;
-	int error;
-
-	/*
-	 * Diagnose required errors first.
-	 */
-	if (CPUCLOCK_PERTHREAD(which_clock) &&
-	    (CPUCLOCK_PID(which_clock) == 0 ||
-	     CPUCLOCK_PID(which_clock) == current->pid))
-		return -EINVAL;
-
-	error = do_cpu_nanosleep(which_clock, flags, rqtp, &it);
-
-	if (error == -ERESTART_RESTARTBLOCK) {
-
-		if (flags & TIMER_ABSTIME)
-			return -ERESTARTNOHAND;
-		/*
-		 * Report back to the user the time still remaining.
-		 */
-		if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
-			return -EFAULT;
-
-		restart_block->fn = posix_cpu_nsleep_restart;
-		restart_block->nanosleep.clockid = which_clock;
-		restart_block->nanosleep.rmtp = rmtp;
-		restart_block->nanosleep.expires = timespec_to_ns(rqtp);
-	}
-	return error;
-}
-
-static long posix_cpu_nsleep_restart(struct restart_block *restart_block)
-{
-	clockid_t which_clock = restart_block->nanosleep.clockid;
-	struct timespec t;
-	struct itimerspec it;
-	int error;
-
-	t = ns_to_timespec(restart_block->nanosleep.expires);
-
-	error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it);
-
-	if (error == -ERESTART_RESTARTBLOCK) {
-		struct timespec __user *rmtp = restart_block->nanosleep.rmtp;
-		/*
-		 * Report back to the user the time still remaining.
-		 */
-		if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
-			return -EFAULT;
-
-		restart_block->nanosleep.expires = timespec_to_ns(&t);
-	}
-	return error;
-
-}
-
-#define PROCESS_CLOCK	MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED)
-#define THREAD_CLOCK	MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED)
-
-static int process_cpu_clock_getres(const clockid_t which_clock,
-				    struct timespec *tp)
-{
-	return posix_cpu_clock_getres(PROCESS_CLOCK, tp);
-}
-static int process_cpu_clock_get(const clockid_t which_clock,
-				 struct timespec *tp)
-{
-	return posix_cpu_clock_get(PROCESS_CLOCK, tp);
-}
-static int process_cpu_timer_create(struct k_itimer *timer)
-{
-	timer->it_clock = PROCESS_CLOCK;
-	return posix_cpu_timer_create(timer);
-}
-static int process_cpu_nsleep(const clockid_t which_clock, int flags,
-			      struct timespec *rqtp,
-			      struct timespec __user *rmtp)
-{
-	return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp);
-}
-static long process_cpu_nsleep_restart(struct restart_block *restart_block)
-{
-	return -EINVAL;
-}
-static int thread_cpu_clock_getres(const clockid_t which_clock,
-				   struct timespec *tp)
-{
-	return posix_cpu_clock_getres(THREAD_CLOCK, tp);
-}
-static int thread_cpu_clock_get(const clockid_t which_clock,
-				struct timespec *tp)
-{
-	return posix_cpu_clock_get(THREAD_CLOCK, tp);
-}
-static int thread_cpu_timer_create(struct k_itimer *timer)
-{
-	timer->it_clock = THREAD_CLOCK;
-	return posix_cpu_timer_create(timer);
-}
-
-struct k_clock clock_posix_cpu = {
-	.clock_getres	= posix_cpu_clock_getres,
-	.clock_set	= posix_cpu_clock_set,
-	.clock_get	= posix_cpu_clock_get,
-	.timer_create	= posix_cpu_timer_create,
-	.nsleep		= posix_cpu_nsleep,
-	.nsleep_restart	= posix_cpu_nsleep_restart,
-	.timer_set	= posix_cpu_timer_set,
-	.timer_del	= posix_cpu_timer_del,
-	.timer_get	= posix_cpu_timer_get,
-};
-
-static __init int init_posix_cpu_timers(void)
-{
-	struct k_clock process = {
-		.clock_getres	= process_cpu_clock_getres,
-		.clock_get	= process_cpu_clock_get,
-		.timer_create	= process_cpu_timer_create,
-		.nsleep		= process_cpu_nsleep,
-		.nsleep_restart	= process_cpu_nsleep_restart,
-	};
-	struct k_clock thread = {
-		.clock_getres	= thread_cpu_clock_getres,
-		.clock_get	= thread_cpu_clock_get,
-		.timer_create	= thread_cpu_timer_create,
-	};
-	struct timespec ts;
-
-	posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process);
-	posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread);
-
-	cputime_to_timespec(cputime_one_jiffy, &ts);
-	onecputick = ts.tv_nsec;
-	WARN_ON(ts.tv_sec != 0);
-
-	return 0;
-}
-__initcall(init_posix_cpu_timers);