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b9c16a0e1f
In commit:659cf9f582("locking/ww_mutex: Optimize ww-mutexes by waking at most one waiter for backoff when acquiring the lock") I replaced a comment with a lockdep_assert_held(). However it turns out we hide that lock from lockdep for hysterical raisins, which results in the assertion always firing. Remove the old debug code as lockdep will easily spot the abuse it was meant to catch, which will make the lock visible to lockdep and make the assertion work as intended. Reported-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nicolai Haehnle <Nicolai.Haehnle@amd.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes:659cf9f582("locking/ww_mutex: Optimize ww-mutexes by waking at most one waiter for backoff when acquiring the lock") Link: http://lkml.kernel.org/r/20170117150609.GB32474@worktop Signed-off-by: Ingo Molnar <mingo@kernel.org>
29 lines
1.0 KiB
C
29 lines
1.0 KiB
C
/*
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* Mutexes: blocking mutual exclusion locks
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*
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* started by Ingo Molnar:
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*
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* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*
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* This file contains mutex debugging related internal declarations,
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* prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
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* More details are in kernel/mutex-debug.c.
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*/
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/*
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* This must be called with lock->wait_lock held.
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*/
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extern void debug_mutex_lock_common(struct mutex *lock,
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struct mutex_waiter *waiter);
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extern void debug_mutex_wake_waiter(struct mutex *lock,
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struct mutex_waiter *waiter);
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extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
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extern void debug_mutex_add_waiter(struct mutex *lock,
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struct mutex_waiter *waiter,
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struct task_struct *task);
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extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
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struct task_struct *task);
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extern void debug_mutex_unlock(struct mutex *lock);
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extern void debug_mutex_init(struct mutex *lock, const char *name,
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struct lock_class_key *key);
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