c051b21f71
The deadlock logic is only required for futexes. Remove the extra arguments for the public functions and also for the futex specific ones which get always called with deadlock detection enabled. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
102 lines
2.8 KiB
C
102 lines
2.8 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 the public data structure and API definitions.
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*/
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#ifndef __LINUX_RT_MUTEX_H
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#define __LINUX_RT_MUTEX_H
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#include <linux/linkage.h>
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#include <linux/rbtree.h>
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#include <linux/spinlock_types.h>
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extern int max_lock_depth; /* for sysctl */
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/**
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* The rt_mutex structure
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*
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* @wait_lock: spinlock to protect the structure
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* @waiters: rbtree root to enqueue waiters in priority order
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* @waiters_leftmost: top waiter
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* @owner: the mutex owner
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*/
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struct rt_mutex {
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raw_spinlock_t wait_lock;
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struct rb_root waiters;
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struct rb_node *waiters_leftmost;
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struct task_struct *owner;
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#ifdef CONFIG_DEBUG_RT_MUTEXES
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int save_state;
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const char *name, *file;
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int line;
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void *magic;
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#endif
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};
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struct rt_mutex_waiter;
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struct hrtimer_sleeper;
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#ifdef CONFIG_DEBUG_RT_MUTEXES
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extern int rt_mutex_debug_check_no_locks_freed(const void *from,
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unsigned long len);
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extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
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#else
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static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
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unsigned long len)
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{
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return 0;
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}
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# define rt_mutex_debug_check_no_locks_held(task) do { } while (0)
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#endif
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#ifdef CONFIG_DEBUG_RT_MUTEXES
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# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
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, .name = #mutexname, .file = __FILE__, .line = __LINE__
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# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__)
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extern void rt_mutex_debug_task_free(struct task_struct *tsk);
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#else
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# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
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# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL)
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# define rt_mutex_debug_task_free(t) do { } while (0)
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#endif
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#define __RT_MUTEX_INITIALIZER(mutexname) \
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{ .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
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, .waiters = RB_ROOT \
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, .owner = NULL \
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__DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
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#define DEFINE_RT_MUTEX(mutexname) \
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struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
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/**
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* rt_mutex_is_locked - is the mutex locked
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* @lock: the mutex to be queried
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*
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* Returns 1 if the mutex is locked, 0 if unlocked.
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*/
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static inline int rt_mutex_is_locked(struct rt_mutex *lock)
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{
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return lock->owner != NULL;
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}
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extern void __rt_mutex_init(struct rt_mutex *lock, const char *name);
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extern void rt_mutex_destroy(struct rt_mutex *lock);
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extern void rt_mutex_lock(struct rt_mutex *lock);
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extern int rt_mutex_lock_interruptible(struct rt_mutex *lock);
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extern int rt_mutex_timed_lock(struct rt_mutex *lock,
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struct hrtimer_sleeper *timeout);
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extern int rt_mutex_trylock(struct rt_mutex *lock);
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extern void rt_mutex_unlock(struct rt_mutex *lock);
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#endif
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