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authorThomas Gleixner <tglx@linutronix.de>2014-06-22 12:06:40 +0200
committerThomas Gleixner <tglx@linutronix.de>2014-06-23 11:22:35 +0200
commit5cee964597260237dd2cabb3ec22bba0da24b25d (patch)
treef548efb4181a4cffb026adf43178e65330533e87 /kernel/itimer.c
parent58394271c610e9c65dd0165a1c1f6dec75dc5f3e (diff)
downloadop-kernel-dev-5cee964597260237dd2cabb3ec22bba0da24b25d.zip
op-kernel-dev-5cee964597260237dd2cabb3ec22bba0da24b25d.tar.gz
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>
Diffstat (limited to 'kernel/itimer.c')
-rw-r--r--kernel/itimer.c301
1 files changed, 0 insertions, 301 deletions
diff --git a/kernel/itimer.c b/kernel/itimer.c
deleted file mode 100644
index 8d262b4..0000000
--- a/kernel/itimer.c
+++ /dev/null
@@ -1,301 +0,0 @@
-/*
- * linux/kernel/itimer.c
- *
- * Copyright (C) 1992 Darren Senn
- */
-
-/* These are all the functions necessary to implement itimers */
-
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/syscalls.h>
-#include <linux/time.h>
-#include <linux/posix-timers.h>
-#include <linux/hrtimer.h>
-#include <trace/events/timer.h>
-
-#include <asm/uaccess.h>
-
-/**
- * itimer_get_remtime - get remaining time for the timer
- *
- * @timer: the timer to read
- *
- * Returns the delta between the expiry time and now, which can be
- * less than zero or 1usec for an pending expired timer
- */
-static struct timeval itimer_get_remtime(struct hrtimer *timer)
-{
- ktime_t rem = hrtimer_get_remaining(timer);
-
- /*
- * Racy but safe: if the itimer expires after the above
- * hrtimer_get_remtime() call but before this condition
- * then we return 0 - which is correct.
- */
- if (hrtimer_active(timer)) {
- if (rem.tv64 <= 0)
- rem.tv64 = NSEC_PER_USEC;
- } else
- rem.tv64 = 0;
-
- return ktime_to_timeval(rem);
-}
-
-static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
- struct itimerval *const value)
-{
- cputime_t cval, cinterval;
- struct cpu_itimer *it = &tsk->signal->it[clock_id];
-
- spin_lock_irq(&tsk->sighand->siglock);
-
- cval = it->expires;
- cinterval = it->incr;
- if (cval) {
- struct task_cputime cputime;
- cputime_t t;
-
- thread_group_cputimer(tsk, &cputime);
- if (clock_id == CPUCLOCK_PROF)
- t = cputime.utime + cputime.stime;
- else
- /* CPUCLOCK_VIRT */
- t = cputime.utime;
-
- if (cval < t)
- /* about to fire */
- cval = cputime_one_jiffy;
- else
- cval = cval - t;
- }
-
- spin_unlock_irq(&tsk->sighand->siglock);
-
- cputime_to_timeval(cval, &value->it_value);
- cputime_to_timeval(cinterval, &value->it_interval);
-}
-
-int do_getitimer(int which, struct itimerval *value)
-{
- struct task_struct *tsk = current;
-
- switch (which) {
- case ITIMER_REAL:
- spin_lock_irq(&tsk->sighand->siglock);
- value->it_value = itimer_get_remtime(&tsk->signal->real_timer);
- value->it_interval =
- ktime_to_timeval(tsk->signal->it_real_incr);
- spin_unlock_irq(&tsk->sighand->siglock);
- break;
- case ITIMER_VIRTUAL:
- get_cpu_itimer(tsk, CPUCLOCK_VIRT, value);
- break;
- case ITIMER_PROF:
- get_cpu_itimer(tsk, CPUCLOCK_PROF, value);
- break;
- default:
- return(-EINVAL);
- }
- return 0;
-}
-
-SYSCALL_DEFINE2(getitimer, int, which, struct itimerval __user *, value)
-{
- int error = -EFAULT;
- struct itimerval get_buffer;
-
- if (value) {
- error = do_getitimer(which, &get_buffer);
- if (!error &&
- copy_to_user(value, &get_buffer, sizeof(get_buffer)))
- error = -EFAULT;
- }
- return error;
-}
-
-
-/*
- * The timer is automagically restarted, when interval != 0
- */
-enum hrtimer_restart it_real_fn(struct hrtimer *timer)
-{
- struct signal_struct *sig =
- container_of(timer, struct signal_struct, real_timer);
-
- trace_itimer_expire(ITIMER_REAL, sig->leader_pid, 0);
- kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
-
- return HRTIMER_NORESTART;
-}
-
-static inline u32 cputime_sub_ns(cputime_t ct, s64 real_ns)
-{
- struct timespec ts;
- s64 cpu_ns;
-
- cputime_to_timespec(ct, &ts);
- cpu_ns = timespec_to_ns(&ts);
-
- return (cpu_ns <= real_ns) ? 0 : cpu_ns - real_ns;
-}
-
-static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
- const struct itimerval *const value,
- struct itimerval *const ovalue)
-{
- cputime_t cval, nval, cinterval, ninterval;
- s64 ns_ninterval, ns_nval;
- u32 error, incr_error;
- struct cpu_itimer *it = &tsk->signal->it[clock_id];
-
- nval = timeval_to_cputime(&value->it_value);
- ns_nval = timeval_to_ns(&value->it_value);
- ninterval = timeval_to_cputime(&value->it_interval);
- ns_ninterval = timeval_to_ns(&value->it_interval);
-
- error = cputime_sub_ns(nval, ns_nval);
- incr_error = cputime_sub_ns(ninterval, ns_ninterval);
-
- spin_lock_irq(&tsk->sighand->siglock);
-
- cval = it->expires;
- cinterval = it->incr;
- if (cval || nval) {
- if (nval > 0)
- nval += cputime_one_jiffy;
- set_process_cpu_timer(tsk, clock_id, &nval, &cval);
- }
- it->expires = nval;
- it->incr = ninterval;
- it->error = error;
- it->incr_error = incr_error;
- trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
- ITIMER_VIRTUAL : ITIMER_PROF, value, nval);
-
- spin_unlock_irq(&tsk->sighand->siglock);
-
- if (ovalue) {
- cputime_to_timeval(cval, &ovalue->it_value);
- cputime_to_timeval(cinterval, &ovalue->it_interval);
- }
-}
-
-/*
- * Returns true if the timeval is in canonical form
- */
-#define timeval_valid(t) \
- (((t)->tv_sec >= 0) && (((unsigned long) (t)->tv_usec) < USEC_PER_SEC))
-
-int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
-{
- struct task_struct *tsk = current;
- struct hrtimer *timer;
- ktime_t expires;
-
- /*
- * Validate the timevals in value.
- */
- if (!timeval_valid(&value->it_value) ||
- !timeval_valid(&value->it_interval))
- return -EINVAL;
-
- switch (which) {
- case ITIMER_REAL:
-again:
- spin_lock_irq(&tsk->sighand->siglock);
- timer = &tsk->signal->real_timer;
- if (ovalue) {
- ovalue->it_value = itimer_get_remtime(timer);
- ovalue->it_interval
- = ktime_to_timeval(tsk->signal->it_real_incr);
- }
- /* We are sharing ->siglock with it_real_fn() */
- if (hrtimer_try_to_cancel(timer) < 0) {
- spin_unlock_irq(&tsk->sighand->siglock);
- goto again;
- }
- expires = timeval_to_ktime(value->it_value);
- if (expires.tv64 != 0) {
- tsk->signal->it_real_incr =
- timeval_to_ktime(value->it_interval);
- hrtimer_start(timer, expires, HRTIMER_MODE_REL);
- } else
- tsk->signal->it_real_incr.tv64 = 0;
-
- trace_itimer_state(ITIMER_REAL, value, 0);
- spin_unlock_irq(&tsk->sighand->siglock);
- break;
- case ITIMER_VIRTUAL:
- set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue);
- break;
- case ITIMER_PROF:
- set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue);
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-/**
- * alarm_setitimer - set alarm in seconds
- *
- * @seconds: number of seconds until alarm
- * 0 disables the alarm
- *
- * Returns the remaining time in seconds of a pending timer or 0 when
- * the timer is not active.
- *
- * On 32 bit machines the seconds value is limited to (INT_MAX/2) to avoid
- * negative timeval settings which would cause immediate expiry.
- */
-unsigned int alarm_setitimer(unsigned int seconds)
-{
- struct itimerval it_new, it_old;
-
-#if BITS_PER_LONG < 64
- if (seconds > INT_MAX)
- seconds = INT_MAX;
-#endif
- it_new.it_value.tv_sec = seconds;
- it_new.it_value.tv_usec = 0;
- it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
-
- do_setitimer(ITIMER_REAL, &it_new, &it_old);
-
- /*
- * We can't return 0 if we have an alarm pending ... And we'd
- * better return too much than too little anyway
- */
- if ((!it_old.it_value.tv_sec && it_old.it_value.tv_usec) ||
- it_old.it_value.tv_usec >= 500000)
- it_old.it_value.tv_sec++;
-
- return it_old.it_value.tv_sec;
-}
-
-SYSCALL_DEFINE3(setitimer, int, which, struct itimerval __user *, value,
- struct itimerval __user *, ovalue)
-{
- struct itimerval set_buffer, get_buffer;
- int error;
-
- if (value) {
- if(copy_from_user(&set_buffer, value, sizeof(set_buffer)))
- return -EFAULT;
- } else {
- memset(&set_buffer, 0, sizeof(set_buffer));
- printk_once(KERN_WARNING "%s calls setitimer() with new_value NULL pointer."
- " Misfeature support will be removed\n",
- current->comm);
- }
-
- error = do_setitimer(which, &set_buffer, ovalue ? &get_buffer : NULL);
- if (error || !ovalue)
- return error;
-
- if (copy_to_user(ovalue, &get_buffer, sizeof(get_buffer)))
- return -EFAULT;
- return 0;
-}
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