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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 | ||
d974d905 SR |
8 | #include <asm/processor.h> /* for cpu_relax() */ |
9 | ||
fb1c8f93 IM |
10 | /* |
11 | * include/linux/spinlock_up.h - UP-debug version of spinlocks. | |
12 | * | |
13 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar | |
14 | * Released under the General Public License (GPL). | |
15 | * | |
16 | * In the debug case, 1 means unlocked, 0 means locked. (the values | |
17 | * are inverted, to catch initialization bugs) | |
18 | * | |
19 | * No atomicity anywhere, we are on UP. | |
20 | */ | |
21 | ||
22 | #ifdef CONFIG_DEBUG_SPINLOCK | |
0199c4e6 | 23 | #define arch_spin_is_locked(x) ((x)->slock == 0) |
fb1c8f93 | 24 | |
0199c4e6 | 25 | static inline void arch_spin_lock(arch_spinlock_t *lock) |
fb1c8f93 IM |
26 | { |
27 | lock->slock = 0; | |
28 | } | |
29 | ||
30 | static inline void | |
0199c4e6 | 31 | arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) |
fb1c8f93 IM |
32 | { |
33 | local_irq_save(flags); | |
34 | lock->slock = 0; | |
35 | } | |
36 | ||
0199c4e6 | 37 | static inline int arch_spin_trylock(arch_spinlock_t *lock) |
fb1c8f93 IM |
38 | { |
39 | char oldval = lock->slock; | |
40 | ||
41 | lock->slock = 0; | |
42 | ||
43 | return oldval > 0; | |
44 | } | |
45 | ||
0199c4e6 | 46 | static inline void arch_spin_unlock(arch_spinlock_t *lock) |
fb1c8f93 IM |
47 | { |
48 | lock->slock = 1; | |
49 | } | |
50 | ||
51 | /* | |
52 | * Read-write spinlocks. No debug version. | |
53 | */ | |
e5931943 TG |
54 | #define arch_read_lock(lock) do { (void)(lock); } while (0) |
55 | #define arch_write_lock(lock) do { (void)(lock); } while (0) | |
56 | #define arch_read_trylock(lock) ({ (void)(lock); 1; }) | |
57 | #define arch_write_trylock(lock) ({ (void)(lock); 1; }) | |
58 | #define arch_read_unlock(lock) do { (void)(lock); } while (0) | |
59 | #define arch_write_unlock(lock) do { (void)(lock); } while (0) | |
fb1c8f93 IM |
60 | |
61 | #else /* DEBUG_SPINLOCK */ | |
0199c4e6 | 62 | #define arch_spin_is_locked(lock) ((void)(lock), 0) |
fb1c8f93 | 63 | /* for sched.c and kernel_lock.c: */ |
0199c4e6 TG |
64 | # define arch_spin_lock(lock) do { (void)(lock); } while (0) |
65 | # define arch_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) | |
66 | # define arch_spin_unlock(lock) do { (void)(lock); } while (0) | |
67 | # define arch_spin_trylock(lock) ({ (void)(lock); 1; }) | |
fb1c8f93 IM |
68 | #endif /* DEBUG_SPINLOCK */ |
69 | ||
0199c4e6 | 70 | #define arch_spin_is_contended(lock) (((void)(lock), 0)) |
95c354fe | 71 | |
e5931943 TG |
72 | #define arch_read_can_lock(lock) (((void)(lock), 1)) |
73 | #define arch_write_can_lock(lock) (((void)(lock), 1)) | |
fb1c8f93 | 74 | |
0199c4e6 TG |
75 | #define arch_spin_unlock_wait(lock) \ |
76 | do { cpu_relax(); } while (arch_spin_is_locked(lock)) | |
fb1c8f93 IM |
77 | |
78 | #endif /* __LINUX_SPINLOCK_UP_H */ |