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lockdep.h revision 1.6 
      1 /*	$NetBSD: lockdep.h,v 1.6 2021/12/19 11:11:19 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_LOCKDEP_H_
     33 #define _LINUX_LOCKDEP_H_
     34 
     35 #include <sys/cdefs.h>
     36 #include <sys/types.h>
     37 
     38 #include <lib/libkern/libkern.h>
     39 
     40 struct mutex;
     41 struct spinlock;
     42 
     43 #define	__acquires(lock)	/* XXX lockdep annotation */
     44 #define	__releases(lock)	/* XXX lockdep annotation */
     45 
     46 #define	__lockdep_used			__debugused
     47 #define	lock_acquire_shared_recursive(l, s, t, n, i)	__nothing
     48 #define	lock_release(l, n)		__nothing
     49 #ifdef notyet
     50 #define	lockdep_assert_held(m)		KDASSERT(lockdep_is_held(m))
     51 #define	lockdep_assert_held_once(m)	KDASSERT(lockdep_is_held(m))
     52 #define	lockdep_is_held(m)		mutex_owned(__lockdep_kmutex(m))
     53 #define	might_lock(m)							      \
     54 	KDASSERT(mutex_ownable(__lockdep_kmutex(m)))
     55 #else
     56 #define	lockdep_assert_held(m)		do {} while (0)
     57 #define	lockdep_assert_held_once(m)	do {} while (0)
     58 #define	lockdep_is_held(m)		1
     59 #define	might_lock(m)			do {} while (0)
     60 #define	might_lock_nested(m,n)		do {} while (0)
     61 #endif
     62 
     63 #define	__lockdep_kmutex(m)						      \
     64 	(__builtin_types_compatible_p(typeof(*(m)), struct mutex) ?	      \
     65 		&((const struct mutex *)(m))->mtx_lock			      \
     66 	    : __builtin_types_compatible_p(typeof(*(m)), struct spinlock) ?   \
     67 		&((const struct spinlock *)(m))->sl_lock		      \
     68 	    : NULL)
     69 
     70 #define	SINGLE_DEPTH_NESTING	0
     71 
     72 struct pin_cookie {
     73 	int	dummy;
     74 };
     75 
     76 static inline struct pin_cookie
     77 lockdep_pin_lock(struct mutex *m)
     78 {
     79 	return (struct pin_cookie) { (int)(intptr_t)m };
     80 }
     81 
     82 static inline void
     83 lockdep_unpin_lock(struct mutex *m, struct pin_cookie cookie)
     84 {
     85 	KASSERT(cookie.dummy == (int)(intptr_t)m);
     86 }
     87 
     88 #endif	/* _LINUX_LOCKDEP_H_ */
     89