diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-08-16 00:28:08 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-08-17 18:18:15 +0300 |
| commit | b576e640ce5e22673e12949cf14ae3cb18d9b859 (patch) | |
| tree | fc43cf3953ecad51677d7f4759e9bc9f84bf78e6 /kernel/locking/rtmutex.c | |
| parent | c014ef69b3acdb8c9e7fc412e96944f4d5c36fa0 (diff) | |
| download | linux-b576e640ce5e22673e12949cf14ae3cb18d9b859.tar.xz | |
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
Diffstat (limited to 'kernel/locking/rtmutex.c')
| -rw-r--r-- | kernel/locking/rtmutex.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index c13b9b849a4b..35f7685d7460 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -347,6 +347,21 @@ static __always_inline void rt_mutex_adjust_prio(struct task_struct *p) rt_mutex_setprio(p, pi_task); } +/* RT mutex specific wake_q wrappers */ +static __always_inline void rt_mutex_wake_q_add(struct rt_wake_q_head *wqh, + struct rt_mutex_waiter *w) +{ + wake_q_add(&wqh->head, w->task); +} + +static __always_inline void rt_mutex_wake_up_q(struct rt_wake_q_head *wqh) +{ + wake_up_q(&wqh->head); + + /* Pairs with preempt_disable() in mark_wakeup_next_waiter() */ + preempt_enable(); +} + /* * Deadlock detection is conditional: * |