Release 4.7 kernel/locking/mutex-debug.c
/*
* kernel/mutex-debug.c
*
* Debugging code for mutexes
*
* Started by Ingo Molnar:
*
* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*
* lock debugging, locking tree, deadlock detection started by:
*
* Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
* Released under the General Public License (GPL).
*/
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/poison.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include "mutex-debug.h"
/*
* Must be called with lock->wait_lock held.
*/
void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
{
memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
waiter->magic = waiter;
INIT_LIST_HEAD(&waiter->list);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 41 | 97.62% | 2 | 66.67% |
| randy dunlap | randy dunlap | 1 | 2.38% | 1 | 33.33% |
| Total | 42 | 100.00% | 3 | 100.00% |
void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)
{
SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
DEBUG_LOCKS_WARN_ON(list_empty(&lock->wait_list));
DEBUG_LOCKS_WARN_ON(waiter->magic != waiter);
DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 58 | 100.00% | 2 | 100.00% |
| Total | 58 | 100.00% | 2 | 100.00% |
void debug_mutex_free_waiter(struct mutex_waiter *waiter)
{
DEBUG_LOCKS_WARN_ON(!list_empty(&waiter->list));
memset(waiter, MUTEX_DEBUG_FREE, sizeof(*waiter));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 34 | 97.14% | 2 | 66.67% |
| randy dunlap | randy dunlap | 1 | 2.86% | 1 | 33.33% |
| Total | 35 | 100.00% | 3 | 100.00% |
void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
struct task_struct *task)
{
SMP_DEBUG_LOCKS_WARN_ON(!spin_is_locked(&lock->wait_lock));
/* Mark the current thread as blocked on the lock: */
task->blocked_on = waiter;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 37 | 94.87% | 2 | 66.67% |
| linus torvalds | linus torvalds | 2 | 5.13% | 1 | 33.33% |
| Total | 39 | 100.00% | 3 | 100.00% |
void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
struct task_struct *task)
{
DEBUG_LOCKS_WARN_ON(list_empty(&waiter->list));
DEBUG_LOCKS_WARN_ON(waiter->task != task);
DEBUG_LOCKS_WARN_ON(task->blocked_on != waiter);
task->blocked_on = NULL;
list_del_init(&waiter->list);
waiter->task = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 67 | 97.10% | 2 | 66.67% |
| linus torvalds | linus torvalds | 2 | 2.90% | 1 | 33.33% |
| Total | 69 | 100.00% | 3 | 100.00% |
void debug_mutex_unlock(struct mutex *lock)
{
if (likely(debug_locks)) {
DEBUG_LOCKS_WARN_ON(lock->magic != lock);
if (!lock->owner)
DEBUG_LOCKS_WARN_ON(!lock->owner);
else
DEBUG_LOCKS_WARN_ON(lock->owner != current);
DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
}
/*
* __mutex_slowpath_needs_to_unlock() is explicitly 0 for debug
* mutexes so that we can do it here after we've verified state.
*/
mutex_clear_owner(lock);
atomic_set(&lock->count, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 51 | 59.30% | 4 | 36.36% |
| liu chuansheng | liu chuansheng | 16 | 18.60% | 1 | 9.09% |
| peter zijlstra | peter zijlstra | 14 | 16.28% | 4 | 36.36% |
| jeremy kerr | jeremy kerr | 3 | 3.49% | 1 | 9.09% |
| chris wilson | chris wilson | 2 | 2.33% | 1 | 9.09% |
| Total | 86 | 100.00% | 11 | 100.00% |
void debug_mutex_init(struct mutex *lock, const char *name,
struct lock_class_key *key)
{
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
* Make sure we are not reinitializing a held lock:
*/
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
lockdep_init_map(&lock->dep_map, name, key, 0);
#endif
lock->magic = lock;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 56 | 91.80% | 3 | 60.00% |
| david woodhouse | david woodhouse | 3 | 4.92% | 1 | 20.00% |
| peter zijlstra | peter zijlstra | 2 | 3.28% | 1 | 20.00% |
| Total | 61 | 100.00% | 5 | 100.00% |
/***
* mutex_destroy - mark a mutex unusable
* @lock: the mutex to be destroyed
*
* This function marks the mutex uninitialized, and any subsequent
* use of the mutex is forbidden. The mutex must not be locked when
* this function is called.
*/
void mutex_destroy(struct mutex *lock)
{
DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock));
lock->magic = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 24 | 100.00% | 2 | 100.00% |
| Total | 24 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(mutex_destroy);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 399 | 88.27% | 5 | 27.78% |
| liu chuansheng | liu chuansheng | 16 | 3.54% | 1 | 5.56% |
| peter zijlstra | peter zijlstra | 16 | 3.54% | 5 | 27.78% |
| randy dunlap | randy dunlap | 5 | 1.11% | 1 | 5.56% |
| linus torvalds | linus torvalds | 4 | 0.88% | 1 | 5.56% |
| jeremy kerr | jeremy kerr | 3 | 0.66% | 1 | 5.56% |
| david woodhouse | david woodhouse | 3 | 0.66% | 1 | 5.56% |
| alexey dobriyan | alexey dobriyan | 3 | 0.66% | 1 | 5.56% |
| chris wilson | chris wilson | 2 | 0.44% | 1 | 5.56% |
| paul gortmaker | paul gortmaker | 1 | 0.22% | 1 | 5.56% |
| Total | 452 | 100.00% | 18 | 100.00% |
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