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6053ee3b IM |
1 | /* |
2 | * Mutexes: blocking mutual exclusion locks | |
3 | * | |
4 | * started by Ingo Molnar: | |
5 | * | |
6 | * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
7 | * | |
8 | * This file contains mutex debugging related internal prototypes, for the | |
9 | * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs: | |
10 | */ | |
11 | ||
1fb00c6c IM |
12 | #define spin_lock_mutex(lock, flags) \ |
13 | do { spin_lock(lock); (void)(flags); } while (0) | |
14 | #define spin_unlock_mutex(lock, flags) \ | |
15 | do { spin_unlock(lock); (void)(flags); } while (0) | |
6720a305 | 16 | #define mutex_remove_waiter(lock, waiter, task) \ |
6053ee3b IM |
17 | __list_del((waiter)->list.prev, (waiter)->list.next) |
18 | ||
7608a43d | 19 | #ifdef CONFIG_MUTEX_SPIN_ON_OWNER |
6e281474 JL |
20 | /* |
21 | * The mutex owner can get read and written to locklessly. | |
22 | * We should use WRITE_ONCE when writing the owner value to | |
23 | * avoid store tearing, otherwise, a thread could potentially | |
24 | * read a partially written and incomplete owner value. | |
25 | */ | |
0d66bf6d PZ |
26 | static inline void mutex_set_owner(struct mutex *lock) |
27 | { | |
6e281474 | 28 | WRITE_ONCE(lock->owner, current); |
0d66bf6d PZ |
29 | } |
30 | ||
31 | static inline void mutex_clear_owner(struct mutex *lock) | |
32 | { | |
6e281474 | 33 | WRITE_ONCE(lock->owner, NULL); |
0d66bf6d PZ |
34 | } |
35 | #else | |
36 | static inline void mutex_set_owner(struct mutex *lock) | |
37 | { | |
38 | } | |
39 | ||
40 | static inline void mutex_clear_owner(struct mutex *lock) | |
41 | { | |
42 | } | |
43 | #endif | |
44 | ||
6053ee3b IM |
45 | #define debug_mutex_wake_waiter(lock, waiter) do { } while (0) |
46 | #define debug_mutex_free_waiter(waiter) do { } while (0) | |
9a11b49a | 47 | #define debug_mutex_add_waiter(lock, waiter, ti) do { } while (0) |
6053ee3b | 48 | #define debug_mutex_unlock(lock) do { } while (0) |
ef5d4707 | 49 | #define debug_mutex_init(lock, name, key) do { } while (0) |
6053ee3b | 50 | |
9a11b49a IM |
51 | static inline void |
52 | debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter) | |
53 | { | |
54 | } |