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timers: Move *sleep*() and timeout functions into a separate file
All schedule_timeout() and *sleep*() related functions are interfaces on top of timer list timers and hrtimers to add a sleep to the code. As they are built on top of the timer list timers and hrtimers, the [hr]timer interfaces are already used except when queuing the timer in schedule_timeout(). But there exists the appropriate interface add_timer() which does the same job with an extra check for an already pending timer. Split all those functions as they are into a separate file and use add_timer() instead of __mod_timer() in schedule_timeout(). While at it fix minor formatting issues and a multi line printk function call in schedule_timeout(). Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/all/20241014-devel-anna-maria-b4-timers-flseep-v3-2-dc8b907cb62f@linutronix.de
This commit is contained in:
Anna-Maria Behnsen
Thomas Gleixner
parent
3a2e83d350
commit
da7bd0a9e0
@ -10167,6 +10167,7 @@ F: include/linux/hrtimer.h
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F: include/linux/timer.h
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F: kernel/time/clockevents.c
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F: kernel/time/hrtimer.c
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F: kernel/time/sleep_timeout.c
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F: kernel/time/timer.c
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F: kernel/time/timer_list.c
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F: kernel/time/timer_migration.*
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@ -1,5 +1,5 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-y += time.o timer.o hrtimer.o
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obj-y += time.o timer.o hrtimer.o sleep_timeout.o
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obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o
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obj-y += timeconv.o timecounter.o alarmtimer.o
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@ -2242,123 +2242,3 @@ void __init hrtimers_init(void)
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hrtimers_prepare_cpu(smp_processor_id());
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open_softirq(HRTIMER_SOFTIRQ, hrtimer_run_softirq);
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}
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/**
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* schedule_hrtimeout_range_clock - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @delta: slack in expires timeout (ktime_t)
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* @mode: timer mode
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* @clock_id: timer clock to be used
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*/
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int __sched
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schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta,
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const enum hrtimer_mode mode, clockid_t clock_id)
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{
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struct hrtimer_sleeper t;
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/*
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* Optimize when a zero timeout value is given. It does not
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* matter whether this is an absolute or a relative time.
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*/
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if (expires && *expires == 0) {
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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/*
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* A NULL parameter means "infinite"
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*/
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if (!expires) {
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schedule();
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return -EINTR;
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}
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hrtimer_init_sleeper_on_stack(&t, clock_id, mode);
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hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
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hrtimer_sleeper_start_expires(&t, mode);
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if (likely(t.task))
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schedule();
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hrtimer_cancel(&t.timer);
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destroy_hrtimer_on_stack(&t.timer);
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__set_current_state(TASK_RUNNING);
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return !t.task ? 0 : -EINTR;
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout_range_clock);
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/**
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* schedule_hrtimeout_range - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @delta: slack in expires timeout (ktime_t)
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* @mode: timer mode
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*
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* Make the current task sleep until the given expiry time has
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* elapsed. The routine will return immediately unless
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* the current task state has been set (see set_current_state()).
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*
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* The @delta argument gives the kernel the freedom to schedule the
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* actual wakeup to a time that is both power and performance friendly
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* for regular (non RT/DL) tasks.
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* The kernel give the normal best effort behavior for "@expires+@delta",
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* but may decide to fire the timer earlier, but no earlier than @expires.
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*
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* You can set the task state as follows -
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*
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* %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
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* pass before the routine returns unless the current task is explicitly
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* woken up, (e.g. by wake_up_process()).
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*
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* %TASK_INTERRUPTIBLE - the routine may return early if a signal is
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* delivered to the current task or the current task is explicitly woken
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* up.
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*
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* The current task state is guaranteed to be TASK_RUNNING when this
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* routine returns.
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*
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* Returns 0 when the timer has expired. If the task was woken before the
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* timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
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* by an explicit wakeup, it returns -EINTR.
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*/
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int __sched schedule_hrtimeout_range(ktime_t *expires, u64 delta,
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const enum hrtimer_mode mode)
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{
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return schedule_hrtimeout_range_clock(expires, delta, mode,
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CLOCK_MONOTONIC);
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
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/**
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* schedule_hrtimeout - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @mode: timer mode
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*
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* Make the current task sleep until the given expiry time has
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* elapsed. The routine will return immediately unless
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* the current task state has been set (see set_current_state()).
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*
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* You can set the task state as follows -
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*
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* %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
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* pass before the routine returns unless the current task is explicitly
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* woken up, (e.g. by wake_up_process()).
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*
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* %TASK_INTERRUPTIBLE - the routine may return early if a signal is
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* delivered to the current task or the current task is explicitly woken
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* up.
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*
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* The current task state is guaranteed to be TASK_RUNNING when this
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* routine returns.
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*
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* Returns 0 when the timer has expired. If the task was woken before the
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* timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
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* by an explicit wakeup, it returns -EINTR.
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*/
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int __sched schedule_hrtimeout(ktime_t *expires,
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const enum hrtimer_mode mode)
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{
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return schedule_hrtimeout_range(expires, 0, mode);
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout);
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317
kernel/time/sleep_timeout.c
Normal file
317
kernel/time/sleep_timeout.c
Normal file
@ -0,0 +1,317 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Kernel internal schedule timeout and sleeping functions
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*/
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#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/debug.h>
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#include "tick-internal.h"
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/*
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* Since schedule_timeout()'s timer is defined on the stack, it must store
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* the target task on the stack as well.
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*/
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struct process_timer {
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struct timer_list timer;
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struct task_struct *task;
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};
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static void process_timeout(struct timer_list *t)
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{
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struct process_timer *timeout = from_timer(timeout, t, timer);
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wake_up_process(timeout->task);
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}
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/**
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* schedule_timeout - sleep until timeout
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* @timeout: timeout value in jiffies
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*
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* Make the current task sleep until @timeout jiffies have elapsed.
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* The function behavior depends on the current task state
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* (see also set_current_state() description):
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*
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* %TASK_RUNNING - the scheduler is called, but the task does not sleep
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* at all. That happens because sched_submit_work() does nothing for
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* tasks in %TASK_RUNNING state.
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*
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* %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
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* pass before the routine returns unless the current task is explicitly
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* woken up, (e.g. by wake_up_process()).
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*
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* %TASK_INTERRUPTIBLE - the routine may return early if a signal is
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* delivered to the current task or the current task is explicitly woken
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* up.
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*
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* The current task state is guaranteed to be %TASK_RUNNING when this
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* routine returns.
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*
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* Specifying a @timeout value of %MAX_SCHEDULE_TIMEOUT will schedule
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* the CPU away without a bound on the timeout. In this case the return
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* value will be %MAX_SCHEDULE_TIMEOUT.
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*
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* Returns: 0 when the timer has expired otherwise the remaining time in
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* jiffies will be returned. In all cases the return value is guaranteed
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* to be non-negative.
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*/
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signed long __sched schedule_timeout(signed long timeout)
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{
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struct process_timer timer;
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unsigned long expire;
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switch (timeout) {
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case MAX_SCHEDULE_TIMEOUT:
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/*
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* These two special cases are useful to be comfortable
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* in the caller. Nothing more. We could take
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* MAX_SCHEDULE_TIMEOUT from one of the negative value
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* but I' d like to return a valid offset (>=0) to allow
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* the caller to do everything it want with the retval.
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*/
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schedule();
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goto out;
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default:
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/*
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* Another bit of PARANOID. Note that the retval will be
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* 0 since no piece of kernel is supposed to do a check
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* for a negative retval of schedule_timeout() (since it
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* should never happens anyway). You just have the printk()
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* that will tell you if something is gone wrong and where.
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*/
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if (timeout < 0) {
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pr_err("%s: wrong timeout value %lx\n", __func__, timeout);
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dump_stack();
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__set_current_state(TASK_RUNNING);
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goto out;
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}
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}
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expire = timeout + jiffies;
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timer.task = current;
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timer_setup_on_stack(&timer.timer, process_timeout, 0);
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timer.timer.expires = expire;
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add_timer(&timer.timer);
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schedule();
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del_timer_sync(&timer.timer);
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/* Remove the timer from the object tracker */
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destroy_timer_on_stack(&timer.timer);
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timeout = expire - jiffies;
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out:
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return timeout < 0 ? 0 : timeout;
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}
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EXPORT_SYMBOL(schedule_timeout);
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/*
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* We can use __set_current_state() here because schedule_timeout() calls
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* schedule() unconditionally.
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*/
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signed long __sched schedule_timeout_interruptible(signed long timeout)
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{
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__set_current_state(TASK_INTERRUPTIBLE);
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return schedule_timeout(timeout);
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}
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EXPORT_SYMBOL(schedule_timeout_interruptible);
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signed long __sched schedule_timeout_killable(signed long timeout)
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{
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__set_current_state(TASK_KILLABLE);
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return schedule_timeout(timeout);
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}
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EXPORT_SYMBOL(schedule_timeout_killable);
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signed long __sched schedule_timeout_uninterruptible(signed long timeout)
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{
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__set_current_state(TASK_UNINTERRUPTIBLE);
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return schedule_timeout(timeout);
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}
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EXPORT_SYMBOL(schedule_timeout_uninterruptible);
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/*
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* Like schedule_timeout_uninterruptible(), except this task will not contribute
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* to load average.
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*/
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signed long __sched schedule_timeout_idle(signed long timeout)
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{
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__set_current_state(TASK_IDLE);
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return schedule_timeout(timeout);
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}
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EXPORT_SYMBOL(schedule_timeout_idle);
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/**
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* schedule_hrtimeout_range_clock - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @delta: slack in expires timeout (ktime_t)
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* @mode: timer mode
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* @clock_id: timer clock to be used
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*/
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int __sched schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta,
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const enum hrtimer_mode mode, clockid_t clock_id)
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{
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struct hrtimer_sleeper t;
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/*
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* Optimize when a zero timeout value is given. It does not
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* matter whether this is an absolute or a relative time.
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*/
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if (expires && *expires == 0) {
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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/*
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* A NULL parameter means "infinite"
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*/
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if (!expires) {
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schedule();
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return -EINTR;
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}
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hrtimer_init_sleeper_on_stack(&t, clock_id, mode);
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hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
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hrtimer_sleeper_start_expires(&t, mode);
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if (likely(t.task))
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schedule();
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hrtimer_cancel(&t.timer);
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destroy_hrtimer_on_stack(&t.timer);
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__set_current_state(TASK_RUNNING);
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return !t.task ? 0 : -EINTR;
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout_range_clock);
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/**
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* schedule_hrtimeout_range - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @delta: slack in expires timeout (ktime_t)
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* @mode: timer mode
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*
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* Make the current task sleep until the given expiry time has
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* elapsed. The routine will return immediately unless
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* the current task state has been set (see set_current_state()).
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*
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* The @delta argument gives the kernel the freedom to schedule the
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* actual wakeup to a time that is both power and performance friendly
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* for regular (non RT/DL) tasks.
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* The kernel give the normal best effort behavior for "@expires+@delta",
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* but may decide to fire the timer earlier, but no earlier than @expires.
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*
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* You can set the task state as follows -
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*
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* %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
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* pass before the routine returns unless the current task is explicitly
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* woken up, (e.g. by wake_up_process()).
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*
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* %TASK_INTERRUPTIBLE - the routine may return early if a signal is
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* delivered to the current task or the current task is explicitly woken
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* up.
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*
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* The current task state is guaranteed to be TASK_RUNNING when this
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* routine returns.
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*
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* Returns: 0 when the timer has expired. If the task was woken before the
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* timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
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* by an explicit wakeup, it returns -EINTR.
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*/
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int __sched schedule_hrtimeout_range(ktime_t *expires, u64 delta,
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const enum hrtimer_mode mode)
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{
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return schedule_hrtimeout_range_clock(expires, delta, mode,
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CLOCK_MONOTONIC);
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
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/**
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* schedule_hrtimeout - sleep until timeout
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* @expires: timeout value (ktime_t)
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* @mode: timer mode
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*
|
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* Make the current task sleep until the given expiry time has
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* elapsed. The routine will return immediately unless
|
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* the current task state has been set (see set_current_state()).
|
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*
|
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* You can set the task state as follows -
|
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*
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* %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to
|
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* pass before the routine returns unless the current task is explicitly
|
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* woken up, (e.g. by wake_up_process()).
|
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*
|
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* %TASK_INTERRUPTIBLE - the routine may return early if a signal is
|
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* delivered to the current task or the current task is explicitly woken
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* up.
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*
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* The current task state is guaranteed to be TASK_RUNNING when this
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* routine returns.
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*
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* Returns: 0 when the timer has expired. If the task was woken before the
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* timer expired by a signal (only possible in state TASK_INTERRUPTIBLE) or
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* by an explicit wakeup, it returns -EINTR.
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*/
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int __sched schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode)
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{
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return schedule_hrtimeout_range(expires, 0, mode);
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}
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EXPORT_SYMBOL_GPL(schedule_hrtimeout);
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/**
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* msleep - sleep safely even with waitqueue interruptions
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* @msecs: Time in milliseconds to sleep for
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*/
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void msleep(unsigned int msecs)
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{
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unsigned long timeout = msecs_to_jiffies(msecs);
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while (timeout)
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timeout = schedule_timeout_uninterruptible(timeout);
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}
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EXPORT_SYMBOL(msleep);
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/**
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* msleep_interruptible - sleep waiting for signals
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* @msecs: Time in milliseconds to sleep for
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*/
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unsigned long msleep_interruptible(unsigned int msecs)
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{
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unsigned long timeout = msecs_to_jiffies(msecs);
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while (timeout && !signal_pending(current))
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timeout = schedule_timeout_interruptible(timeout);
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return jiffies_to_msecs(timeout);
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}
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EXPORT_SYMBOL(msleep_interruptible);
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/**
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* usleep_range_state - Sleep for an approximate time in a given state
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* @min: Minimum time in usecs to sleep
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* @max: Maximum time in usecs to sleep
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* @state: State of the current task that will be while sleeping
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*
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* In non-atomic context where the exact wakeup time is flexible, use
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* usleep_range_state() instead of udelay(). The sleep improves responsiveness
|
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* by avoiding the CPU-hogging busy-wait of udelay(), and the range reduces
|
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* power usage by allowing hrtimers to take advantage of an already-
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* scheduled interrupt instead of scheduling a new one just for this sleep.
|
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*/
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void __sched usleep_range_state(unsigned long min, unsigned long max, unsigned int state)
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{
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ktime_t exp = ktime_add_us(ktime_get(), min);
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||||
u64 delta = (u64)(max - min) * NSEC_PER_USEC;
|
||||
|
||||
for (;;) {
|
||||
__set_current_state(state);
|
||||
/* Do not return before the requested sleep time has elapsed */
|
||||
if (!schedule_hrtimeout_range(&exp, delta, HRTIMER_MODE_ABS))
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(usleep_range_state);
|
||||
@ -37,7 +37,6 @@
|
||||
#include <linux/tick.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/irq_work.h>
|
||||
#include <linux/sched/signal.h>
|
||||
#include <linux/sched/sysctl.h>
|
||||
#include <linux/sched/nohz.h>
|
||||
#include <linux/sched/debug.h>
|
||||
@ -2526,141 +2525,6 @@ void update_process_times(int user_tick)
|
||||
run_posix_cpu_timers();
|
||||
}
|
||||
|
||||
/*
|
||||
* Since schedule_timeout()'s timer is defined on the stack, it must store
|
||||
* the target task on the stack as well.
|
||||
*/
|
||||
struct process_timer {
|
||||
struct timer_list timer;
|
||||
struct task_struct *task;
|
||||
};
|
||||
|
||||
static void process_timeout(struct timer_list *t)
|
||||
{
|
||||
struct process_timer *timeout = from_timer(timeout, t, timer);
|
||||
|
||||
wake_up_process(timeout->task);
|
||||
}
|
||||
|
||||
/**
|
||||
* schedule_timeout - sleep until timeout
|
||||
* @timeout: timeout value in jiffies
|
||||
*
|
||||
* Make the current task sleep until @timeout jiffies have elapsed.
|
||||
* The function behavior depends on the current task state
|
||||
* (see also set_current_state() description):
|
||||
*
|
||||
* %TASK_RUNNING - the scheduler is called, but the task does not sleep
|
||||
* at all. That happens because sched_submit_work() does nothing for
|
||||
* tasks in %TASK_RUNNING state.
|
||||
*
|
||||
* %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
|
||||
* 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 or the current task is explicitly woken
|
||||
* up.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* 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)
|
||||
{
|
||||
struct process_timer 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();
|
||||
__set_current_state(TASK_RUNNING);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
expire = timeout + jiffies;
|
||||
|
||||
timer.task = current;
|
||||
timer_setup_on_stack(&timer.timer, process_timeout, 0);
|
||||
__mod_timer(&timer.timer, expire, MOD_TIMER_NOTPENDING);
|
||||
schedule();
|
||||
del_timer_sync(&timer.timer);
|
||||
|
||||
/* Remove the timer from the object tracker */
|
||||
destroy_timer_on_stack(&timer.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);
|
||||
|
||||
/*
|
||||
* Like schedule_timeout_uninterruptible(), except this task will not contribute
|
||||
* to load average.
|
||||
*/
|
||||
signed long __sched schedule_timeout_idle(signed long timeout)
|
||||
{
|
||||
__set_current_state(TASK_IDLE);
|
||||
return schedule_timeout(timeout);
|
||||
}
|
||||
EXPORT_SYMBOL(schedule_timeout_idle);
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
static void migrate_timer_list(struct timer_base *new_base, struct hlist_head *head)
|
||||
{
|
||||
@ -2757,59 +2621,3 @@ void __init init_timers(void)
|
||||
posix_cputimers_init_work();
|
||||
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);
|
||||
|
||||
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);
|
||||
|
||||
while (timeout && !signal_pending(current))
|
||||
timeout = schedule_timeout_interruptible(timeout);
|
||||
return jiffies_to_msecs(timeout);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(msleep_interruptible);
|
||||
|
||||
/**
|
||||
* usleep_range_state - Sleep for an approximate time in a given state
|
||||
* @min: Minimum time in usecs to sleep
|
||||
* @max: Maximum time in usecs to sleep
|
||||
* @state: State of the current task that will be while sleeping
|
||||
*
|
||||
* In non-atomic context where the exact wakeup time is flexible, use
|
||||
* usleep_range_state() instead of udelay(). The sleep improves responsiveness
|
||||
* by avoiding the CPU-hogging busy-wait of udelay(), and the range reduces
|
||||
* power usage by allowing hrtimers to take advantage of an already-
|
||||
* scheduled interrupt instead of scheduling a new one just for this sleep.
|
||||
*/
|
||||
void __sched usleep_range_state(unsigned long min, unsigned long max,
|
||||
unsigned int state)
|
||||
{
|
||||
ktime_t exp = ktime_add_us(ktime_get(), min);
|
||||
u64 delta = (u64)(max - min) * NSEC_PER_USEC;
|
||||
|
||||
for (;;) {
|
||||
__set_current_state(state);
|
||||
/* Do not return before the requested sleep time has elapsed */
|
||||
if (!schedule_hrtimeout_range(&exp, delta, HRTIMER_MODE_ABS))
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(usleep_range_state);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user