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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 | |
0199c4e6 | 21 | #define arch_spin_is_locked(x) ((x)->slock == 0) |
fb1c8f93 | 22 | |
0199c4e6 | 23 | static inline void arch_spin_lock(arch_spinlock_t *lock) |
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24 | { |
25 | lock->slock = 0; | |
26 | } | |
27 | ||
28 | static inline void | |
0199c4e6 | 29 | arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) |
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30 | { |
31 | local_irq_save(flags); | |
32 | lock->slock = 0; | |
33 | } | |
34 | ||
0199c4e6 | 35 | static inline int arch_spin_trylock(arch_spinlock_t *lock) |
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36 | { |
37 | char oldval = lock->slock; | |
38 | ||
39 | lock->slock = 0; | |
40 | ||
41 | return oldval > 0; | |
42 | } | |
43 | ||
0199c4e6 | 44 | static inline void arch_spin_unlock(arch_spinlock_t *lock) |
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45 | { |
46 | lock->slock = 1; | |
47 | } | |
48 | ||
49 | /* | |
50 | * Read-write spinlocks. No debug version. | |
51 | */ | |
e5931943 TG |
52 | #define arch_read_lock(lock) do { (void)(lock); } while (0) |
53 | #define arch_write_lock(lock) do { (void)(lock); } while (0) | |
54 | #define arch_read_trylock(lock) ({ (void)(lock); 1; }) | |
55 | #define arch_write_trylock(lock) ({ (void)(lock); 1; }) | |
56 | #define arch_read_unlock(lock) do { (void)(lock); } while (0) | |
57 | #define arch_write_unlock(lock) do { (void)(lock); } while (0) | |
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58 | |
59 | #else /* DEBUG_SPINLOCK */ | |
0199c4e6 | 60 | #define arch_spin_is_locked(lock) ((void)(lock), 0) |
fb1c8f93 | 61 | /* for sched.c and kernel_lock.c: */ |
0199c4e6 TG |
62 | # define arch_spin_lock(lock) do { (void)(lock); } while (0) |
63 | # define arch_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) | |
64 | # define arch_spin_unlock(lock) do { (void)(lock); } while (0) | |
65 | # define arch_spin_trylock(lock) ({ (void)(lock); 1; }) | |
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66 | #endif /* DEBUG_SPINLOCK */ |
67 | ||
0199c4e6 | 68 | #define arch_spin_is_contended(lock) (((void)(lock), 0)) |
95c354fe | 69 | |
e5931943 TG |
70 | #define arch_read_can_lock(lock) (((void)(lock), 1)) |
71 | #define arch_write_can_lock(lock) (((void)(lock), 1)) | |
fb1c8f93 | 72 | |
0199c4e6 TG |
73 | #define arch_spin_unlock_wait(lock) \ |
74 | do { cpu_relax(); } while (arch_spin_is_locked(lock)) | |
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75 | |
76 | #endif /* __LINUX_SPINLOCK_UP_H */ |