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locking/rtmutex: Extend the rtmutex core to support ww_mutex

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Add a ww acquire context pointer to the waiter and various functions and
add the ww_mutex related invocations to the proper spots in the locking
code, similar to the mutex based variant.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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/20210815211304.966139174@linutronix.de
This commit is contained in:
Peter Zijlstra 2021-08-15 23:28:58 +02:00 • committed by Ingo Molnar
parent 2408f7a378
commit add461325e
4 changed files with 114 additions and 13 deletions
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4
kernel/locking/rtmutex_api.c
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@ -267,7 +267,7 @@ int __sched __rt_mutex_start_proxy_lock(struct rt_mutex_base *lock,
return 1;
/* We enforce deadlock detection for futexes */
ret = task_blocks_on_rt_mutex(lock, waiter, task,
ret = task_blocks_on_rt_mutex(lock, waiter, task, NULL,
RT_MUTEX_FULL_CHAINWALK);
if (ret && !rt_mutex_owner(lock)) {
@ -343,7 +343,7 @@ int __sched rt_mutex_wait_proxy_lock(struct rt_mutex_base *lock,
raw_spin_lock_irq(&lock->wait_lock);
/* sleep on the mutex */
set_current_state(TASK_INTERRUPTIBLE);
ret = rt_mutex_slowlock_block(lock, TASK_INTERRUPTIBLE, to, waiter);
ret = rt_mutex_slowlock_block(lock, NULL, TASK_INTERRUPTIBLE, to, waiter);
/*
* try_to_take_rt_mutex() sets the waiter bit unconditionally. We might
* have to fix that up.