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![Ingo Molnar](/assets/img/avatar_default.png)
Generic lock debugging: - generalized lock debugging framework. For example, a bug in one lock subsystem turns off debugging in all lock subsystems. - got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from the mutex/rtmutex debugging code: it caused way too much prototype hackery, and lockdep will give the same information anyway. - ability to do silent tests - check lock freeing in vfree too. - more finegrained debugging options, to allow distributions to turn off more expensive debugging features. There's no separate 'held mutexes' list anymore - but there's a 'held locks' stack within lockdep, which unifies deadlock detection across all lock classes. (this is independent of the lockdep validation stuff - lockdep first checks whether we are holding a lock already) Here are the current debugging options: CONFIG_DEBUG_MUTEXES=y CONFIG_DEBUG_LOCK_ALLOC=y which do: config DEBUG_MUTEXES bool "Mutex debugging, basic checks" config DEBUG_LOCK_ALLOC bool "Detect incorrect freeing of live mutexes" Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
/*
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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
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rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task);
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extern void rt_mutex_deadlock_account_unlock(struct task_struct *task);
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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);
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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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extern void debug_rt_mutex_deadlock(int detect, struct rt_mutex_waiter *waiter,
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struct rt_mutex *lock);
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extern void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter);
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# define debug_rt_mutex_reset_waiter(w) \
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do { (w)->deadlock_lock = NULL; } while (0)
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static inline int debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter,
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int detect)
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{
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return (waiter != NULL);
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}
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