diff options
Diffstat (limited to 'kernel/time/timer.c')
| -rw-r--r-- | kernel/time/timer.c | 48 |
1 files changed, 18 insertions, 30 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index c611c47de884..ea4fbf8477a9 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1615,7 +1615,8 @@ void update_process_times(int user_tick) irq_work_tick(); #endif scheduler_tick(); - run_posix_cpu_timers(p); + if (IS_ENABLED(CONFIG_POSIX_TIMERS)) + run_posix_cpu_timers(p); } /** @@ -1676,19 +1677,6 @@ void run_local_timers(void) 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); @@ -1705,11 +1693,12 @@ static void process_timeout(unsigned long __data) * 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 + * pass before the routine returns unless the current task is explicitly + * woken up, (e.g. by wake_up_process())". * * %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 + * delivered to the current task or the current task is explicitly woken + * up. * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. @@ -1718,7 +1707,9 @@ static void process_timeout(unsigned long __data) * 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. + * Returns 0 when the timer has expired otherwise the remaining time in + * jiffies will be returned. In all cases the return value is guaranteed + * to be non-negative. */ signed long __sched schedule_timeout(signed long timeout) { @@ -1910,16 +1901,6 @@ unsigned long msleep_interruptible(unsigned int msecs) EXPORT_SYMBOL(msleep_interruptible); -static void __sched do_usleep_range(unsigned long min, unsigned long max) -{ - ktime_t kmin; - u64 delta; - - kmin = ktime_set(0, min * NSEC_PER_USEC); - delta = (u64)(max - min) * NSEC_PER_USEC; - schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL); -} - /** * usleep_range - Sleep for an approximate time * @min: Minimum time in usecs to sleep @@ -1933,7 +1914,14 @@ static void __sched do_usleep_range(unsigned long min, unsigned long max) */ void __sched usleep_range(unsigned long min, unsigned long max) { - __set_current_state(TASK_UNINTERRUPTIBLE); - do_usleep_range(min, max); + ktime_t exp = ktime_add_us(ktime_get(), min); + u64 delta = (u64)(max - min) * NSEC_PER_USEC; + + for (;;) { + __set_current_state(TASK_UNINTERRUPTIBLE); + /* Do not return before the requested sleep time has elapsed */ + if (!schedule_hrtimeout_range(&exp, delta, HRTIMER_MODE_ABS)) + break; + } } EXPORT_SYMBOL(usleep_range); |