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locking/rtmutex: Provide rt_wake_q_head and helpers
To handle the difference between wakeups for regular sleeping locks (mutex, rtmutex, rw_semaphore) and the wakeups for 'sleeping' spin/rwlocks on PREEMPT_RT enabled kernels correctly, it is required to provide a wake_q_head construct which allows to keep them separate. Provide a wrapper around wake_q_head and the required helpers, which will be extended with the state handling later. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210815211303.139337655@linutronix.de
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@ -347,6 +347,21 @@ static __always_inline void rt_mutex_adjust_prio(struct task_struct *p)
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rt_mutex_setprio(p, pi_task);
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}
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/* RT mutex specific wake_q wrappers */
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static __always_inline void rt_mutex_wake_q_add(struct rt_wake_q_head *wqh,
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struct rt_mutex_waiter *w)
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{
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wake_q_add(&wqh->head, w->task);
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}
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static __always_inline void rt_mutex_wake_up_q(struct rt_wake_q_head *wqh)
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{
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wake_up_q(&wqh->head);
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/* Pairs with preempt_disable() in mark_wakeup_next_waiter() */
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preempt_enable();
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}
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/*
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* Deadlock detection is conditional:
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*
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@ -39,6 +39,20 @@ struct rt_mutex_waiter {
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u64 deadline;
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};
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/**
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* rt_wake_q_head - Wrapper around regular wake_q_head to support
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* "sleeping" spinlocks on RT
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* @head: The regular wake_q_head for sleeping lock variants
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*/
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struct rt_wake_q_head {
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struct wake_q_head head;
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};
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#define DEFINE_RT_WAKE_Q(name) \
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struct rt_wake_q_head name = { \
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.head = WAKE_Q_HEAD_INITIALIZER(name.head), \
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}
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/*
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* PI-futex support (proxy locking functions, etc.):
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*/
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