1 #ifndef __LINUX_SPINLOCK_UP_H 1 #ifndef __LINUX_SPINLOCK_UP_H
2 #define __LINUX_SPINLOCK_UP_H 2 #define __LINUX_SPINLOCK_UP_H
3 3
4 #ifndef __LINUX_INSIDE_SPINLOCK_H !! 4 #ifndef __LINUX_SPINLOCK_H
5 # error "please don't include this file direct 5 # error "please don't include this file directly"
6 #endif 6 #endif
7 7
8 #include <asm/processor.h> /* for cpu_rel <<
9 #include <asm/barrier.h> <<
10 <<
11 /* 8 /*
12 * include/linux/spinlock_up.h - UP-debug vers 9 * include/linux/spinlock_up.h - UP-debug version of spinlocks.
13 * 10 *
14 * portions Copyright 2005, Red Hat, Inc., Ing 11 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
15 * Released under the General Public License ( 12 * Released under the General Public License (GPL).
16 * 13 *
17 * In the debug case, 1 means unlocked, 0 mean 14 * In the debug case, 1 means unlocked, 0 means locked. (the values
18 * are inverted, to catch initialization bugs) 15 * are inverted, to catch initialization bugs)
19 * 16 *
20 * No atomicity anywhere, we are on UP. Howeve !! 17 * No atomicity anywhere, we are on UP.
21 * the compiler barriers, because we do not wa <<
22 * move potentially faulting instructions (not <<
23 * into the locked sequence, resulting in non- <<
24 */ 18 */
25 19
26 #ifdef CONFIG_DEBUG_SPINLOCK 20 #ifdef CONFIG_DEBUG_SPINLOCK
27 #define arch_spin_is_locked(x) ((x)-> !! 21 #define __raw_spin_is_locked(x) ((x)->slock == 0)
28 22
29 static inline void arch_spin_lock(arch_spinloc !! 23 static inline void __raw_spin_lock(raw_spinlock_t *lock)
30 { 24 {
31 lock->slock = 0; 25 lock->slock = 0;
32 barrier(); <<
33 } 26 }
34 27
35 static inline int arch_spin_trylock(arch_spinl !! 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 { 36 {
37 char oldval = lock->slock; 37 char oldval = lock->slock;
38 38
39 lock->slock = 0; 39 lock->slock = 0;
40 barrier(); <<
41 40
42 return oldval > 0; 41 return oldval > 0;
43 } 42 }
44 43
45 static inline void arch_spin_unlock(arch_spinl !! 44 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
46 { 45 {
47 barrier(); <<
48 lock->slock = 1; 46 lock->slock = 1;
49 } 47 }
50 48
51 /* 49 /*
52 * Read-write spinlocks. No debug version. 50 * Read-write spinlocks. No debug version.
53 */ 51 */
54 #define arch_read_lock(lock) do { b !! 52 #define __raw_read_lock(lock) do { (void)(lock); } while (0)
55 #define arch_write_lock(lock) do { b !! 53 #define __raw_write_lock(lock) do { (void)(lock); } while (0)
56 #define arch_read_trylock(lock) ({ barrier(); !! 54 #define __raw_read_trylock(lock) ({ (void)(lock); 1; })
57 #define arch_write_trylock(lock) ({ bar !! 55 #define __raw_write_trylock(lock) ({ (void)(lock); 1; })
58 #define arch_read_unlock(lock) do { b !! 56 #define __raw_read_unlock(lock) do { (void)(lock); } while (0)
59 #define arch_write_unlock(lock) do { barrier() !! 57 #define __raw_write_unlock(lock) do { (void)(lock); } while (0)
60 58
61 #else /* DEBUG_SPINLOCK */ 59 #else /* DEBUG_SPINLOCK */
62 #define arch_spin_is_locked(lock) ((void !! 60 #define __raw_spin_is_locked(lock) ((void)(lock), 0)
63 /* for sched/core.c and kernel_lock.c: */ !! 61 /* for sched.c and kernel_lock.c: */
64 # define arch_spin_lock(lock) do { b !! 62 # define __raw_spin_lock(lock) do { (void)(lock); } while (0)
65 # define arch_spin_unlock(lock) do { barrier() !! 63 # define __raw_spin_lock_flags(lock, flags) do { (void)(lock); } while (0)
66 # define arch_spin_trylock(lock) ({ bar !! 64 # define __raw_spin_unlock(lock) do { (void)(lock); } while (0)
>> 65 # define __raw_spin_trylock(lock) ({ (void)(lock); 1; })
67 #endif /* DEBUG_SPINLOCK */ 66 #endif /* DEBUG_SPINLOCK */
68 67
69 #define arch_spin_is_contended(lock) (((voi !! 68 #define __raw_spin_is_contended(lock) (((void)(lock), 0))
>> 69
>> 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))
70 75
71 #endif /* __LINUX_SPINLOCK_UP_H */ 76 #endif /* __LINUX_SPINLOCK_UP_H */
72 77
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