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linux
locking/mutex: split out mutex_types.h
Trimming down sched.h dependencies: we don't want to include more than
the base types.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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-52
+1
-51
include/linux/mutex.h
+1
-51
include/linux/mutex.h
···
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#include <linux/osq_lock.h>
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#include <linux/debug_locks.h>
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#include <linux/cleanup.h>
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#include <linux/mutex_types.h>
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
···
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#endif
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#ifndef CONFIG_PREEMPT_RT
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-
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/*
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* Simple, straightforward mutexes with strict semantics:
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*
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* - only one task can hold the mutex at a time
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* - only the owner can unlock the mutex
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* - multiple unlocks are not permitted
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* - recursive locking is not permitted
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* - a mutex object must be initialized via the API
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* - a mutex object must not be initialized via memset or copying
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* - task may not exit with mutex held
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* - memory areas where held locks reside must not be freed
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* - held mutexes must not be reinitialized
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* - mutexes may not be used in hardware or software interrupt
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* contexts such as tasklets and timers
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*
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* These semantics are fully enforced when DEBUG_MUTEXES is
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* enabled. Furthermore, besides enforcing the above rules, the mutex
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* debugging code also implements a number of additional features
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* that make lock debugging easier and faster:
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*
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* - uses symbolic names of mutexes, whenever they are printed in debug output
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* - point-of-acquire tracking, symbolic lookup of function names
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* - list of all locks held in the system, printout of them
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* - owner tracking
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* - detects self-recursing locks and prints out all relevant info
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* - detects multi-task circular deadlocks and prints out all affected
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* locks and tasks (and only those tasks)
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*/
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struct mutex {
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atomic_long_t owner;
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raw_spinlock_t wait_lock;
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#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
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struct optimistic_spin_queue osq; /* Spinner MCS lock */
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#endif
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struct list_head wait_list;
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#ifdef CONFIG_DEBUG_MUTEXES
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void *magic;
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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};
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#ifdef CONFIG_DEBUG_MUTEXES
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···
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/*
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* Preempt-RT variant based on rtmutexes.
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*/
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#include <linux/rtmutex.h>
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struct mutex {
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struct rt_mutex_base rtmutex;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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};
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#define __MUTEX_INITIALIZER(mutexname) \
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{ \
+71
include/linux/mutex_types.h
+71
include/linux/mutex_types.h
···
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_MUTEX_TYPES_H
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#define __LINUX_MUTEX_TYPES_H
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#include <linux/atomic.h>
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#include <linux/lockdep_types.h>
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#include <linux/osq_lock.h>
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#include <linux/spinlock_types.h>
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#include <linux/types.h>
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#ifndef CONFIG_PREEMPT_RT
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/*
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* Simple, straightforward mutexes with strict semantics:
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+
*
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* - only one task can hold the mutex at a time
17
+
* - only the owner can unlock the mutex
18
+
* - multiple unlocks are not permitted
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+
* - recursive locking is not permitted
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+
* - a mutex object must be initialized via the API
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+
* - a mutex object must not be initialized via memset or copying
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+
* - task may not exit with mutex held
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+
* - memory areas where held locks reside must not be freed
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+
* - held mutexes must not be reinitialized
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+
* - mutexes may not be used in hardware or software interrupt
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+
* contexts such as tasklets and timers
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+
*
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* These semantics are fully enforced when DEBUG_MUTEXES is
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+
* enabled. Furthermore, besides enforcing the above rules, the mutex
30
+
* debugging code also implements a number of additional features
31
+
* that make lock debugging easier and faster:
32
+
*
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+
* - uses symbolic names of mutexes, whenever they are printed in debug output
34
+
* - point-of-acquire tracking, symbolic lookup of function names
35
+
* - list of all locks held in the system, printout of them
36
+
* - owner tracking
37
+
* - detects self-recursing locks and prints out all relevant info
38
+
* - detects multi-task circular deadlocks and prints out all affected
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* locks and tasks (and only those tasks)
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*/
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struct mutex {
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atomic_long_t owner;
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raw_spinlock_t wait_lock;
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#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
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struct optimistic_spin_queue osq; /* Spinner MCS lock */
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#endif
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struct list_head wait_list;
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#ifdef CONFIG_DEBUG_MUTEXES
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void *magic;
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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};
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#else /* !CONFIG_PREEMPT_RT */
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/*
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* Preempt-RT variant based on rtmutexes.
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*/
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#include <linux/rtmutex.h>
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struct mutex {
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struct rt_mutex_base rtmutex;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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};
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#endif /* CONFIG_PREEMPT_RT */
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#endif /* __LINUX_MUTEX_TYPES_H */