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1 | #ifndef __LINUX_SPINLOCK_UP_H |
2 | #define __LINUX_SPINLOCK_UP_H | |
3 | ||
4 | #ifndef __LINUX_SPINLOCK_H | |
5 | # error "please don't include this file directly" | |
6 | #endif | |
7 | ||
8 | /* | |
9 | * include/linux/spinlock_up.h - UP-debug version of spinlocks. | |
10 | * | |
11 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar | |
12 | * Released under the General Public License (GPL). | |
13 | * | |
14 | * In the debug case, 1 means unlocked, 0 means locked. (the values | |
15 | * are inverted, to catch initialization bugs) | |
16 | * | |
17 | * No atomicity anywhere, we are on UP. | |
18 | */ | |
19 | ||
20 | #ifdef CONFIG_DEBUG_SPINLOCK | |
fb1c8f93 IM |
21 | #define __raw_spin_is_locked(x) ((x)->slock == 0) |
22 | ||
23 | static inline void __raw_spin_lock(raw_spinlock_t *lock) | |
24 | { | |
25 | lock->slock = 0; | |
26 | } | |
27 | ||
28 | static inline void | |
29 | __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) | |
30 | { | |
31 | local_irq_save(flags); | |
32 | lock->slock = 0; | |
33 | } | |
34 | ||
35 | static inline int __raw_spin_trylock(raw_spinlock_t *lock) | |
36 | { | |
37 | char oldval = lock->slock; | |
38 | ||
39 | lock->slock = 0; | |
40 | ||
41 | return oldval > 0; | |
42 | } | |
43 | ||
44 | static inline void __raw_spin_unlock(raw_spinlock_t *lock) | |
45 | { | |
46 | lock->slock = 1; | |
47 | } | |
48 | ||
49 | /* | |
50 | * Read-write spinlocks. No debug version. | |
51 | */ | |
52 | #define __raw_read_lock(lock) do { (void)(lock); } while (0) | |
53 | #define __raw_write_lock(lock) do { (void)(lock); } while (0) | |
54 | #define __raw_read_trylock(lock) ({ (void)(lock); 1; }) | |
55 | #define __raw_write_trylock(lock) ({ (void)(lock); 1; }) | |
56 | #define __raw_read_unlock(lock) do { (void)(lock); } while (0) | |
57 | #define __raw_write_unlock(lock) do { (void)(lock); } while (0) | |
58 | ||
59 | #else /* DEBUG_SPINLOCK */ | |
60 | #define __raw_spin_is_locked(lock) ((void)(lock), 0) | |
61 | /* for sched.c and kernel_lock.c: */ | |
62 | # define __raw_spin_lock(lock) do { (void)(lock); } while (0) | |
04dce7d9 | 63 | # define __raw_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) |
fb1c8f93 IM |
64 | # define __raw_spin_unlock(lock) do { (void)(lock); } while (0) |
65 | # define __raw_spin_trylock(lock) ({ (void)(lock); 1; }) | |
66 | #endif /* DEBUG_SPINLOCK */ | |
67 | ||
95c354fe NP |
68 | #define __raw_spin_is_contended(lock) (((void)(lock), 0)) |
69 | ||
fb1c8f93 IM |
70 | #define __raw_read_can_lock(lock) (((void)(lock), 1)) |
71 | #define __raw_write_can_lock(lock) (((void)(lock), 1)) | |
72 | ||
73 | #define __raw_spin_unlock_wait(lock) \ | |
74 | do { cpu_relax(); } while (__raw_spin_is_locked(lock)) | |
75 | ||
76 | #endif /* __LINUX_SPINLOCK_UP_H */ |