6d41c675a5
The rtmutex specific deadlock detector predates lockdep coverage of rtmutex
and since commit f5694788ad ("rt_mutex: Add lockdep annotations") it
contains a lot of redundant functionality:
- lockdep will detect an potential deadlock before rtmutex-debug
has a chance to do so
- the deadlock debugging is restricted to rtmutexes which are not
associated to futexes and have an active waiter, which is covered by
lockdep already
Remove the redundant functionality and move actual deadlock WARN() into the
deadlock code path. The latter needs a seperate cleanup.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210326153943.320398604@linutronix.de
27 lines
1.0 KiB
C
27 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* RT-Mutexes: blocking mutual exclusion locks with PI support
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*
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* started by Ingo Molnar and Thomas Gleixner:
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*
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* Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
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*
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* This file contains macros used solely by rtmutex.c. Debug version.
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*/
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extern void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
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extern void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter);
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extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name, struct lock_class_key *key);
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extern void debug_rt_mutex_lock(struct rt_mutex *lock);
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extern void debug_rt_mutex_unlock(struct rt_mutex *lock);
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extern void debug_rt_mutex_proxy_lock(struct rt_mutex *lock,
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struct task_struct *powner);
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extern void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock);
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static inline bool debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter,
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enum rtmutex_chainwalk walk)
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{
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return (waiter != NULL);
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}
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