ia64/linux-2.6.18-xen.hg

view include/asm-v850/semaphore.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 #ifndef __V850_SEMAPHORE_H__
2 #define __V850_SEMAPHORE_H__
4 #include <linux/linkage.h>
5 #include <linux/spinlock.h>
6 #include <linux/wait.h>
7 #include <linux/rwsem.h>
9 #include <asm/atomic.h>
11 struct semaphore {
12 atomic_t count;
13 int sleepers;
14 wait_queue_head_t wait;
15 };
17 #define __SEMAPHORE_INITIALIZER(name,count) \
18 { ATOMIC_INIT (count), 0, \
19 __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
21 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
22 struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
24 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1)
25 #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0)
27 static inline void sema_init (struct semaphore *sem, int val)
28 {
29 *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
30 }
32 static inline void init_MUTEX (struct semaphore *sem)
33 {
34 sema_init (sem, 1);
35 }
37 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
38 {
39 sema_init (sem, 0);
40 }
42 /*
43 * special register calling convention
44 */
45 asmlinkage void __down_failed (void);
46 asmlinkage int __down_interruptible_failed (void);
47 asmlinkage int __down_trylock_failed (void);
48 asmlinkage void __up_wakeup (void);
50 extern void __down (struct semaphore * sem);
51 extern int __down_interruptible (struct semaphore * sem);
52 extern int __down_trylock (struct semaphore * sem);
53 extern void __up (struct semaphore * sem);
55 static inline void down (struct semaphore * sem)
56 {
57 might_sleep();
58 if (atomic_dec_return (&sem->count) < 0)
59 __down (sem);
60 }
62 static inline int down_interruptible (struct semaphore * sem)
63 {
64 int ret = 0;
65 might_sleep();
66 if (atomic_dec_return (&sem->count) < 0)
67 ret = __down_interruptible (sem);
68 return ret;
69 }
71 static inline int down_trylock (struct semaphore *sem)
72 {
73 int ret = 0;
74 if (atomic_dec_return (&sem->count) < 0)
75 ret = __down_trylock (sem);
76 return ret;
77 }
79 static inline void up (struct semaphore * sem)
80 {
81 if (atomic_inc_return (&sem->count) <= 0)
82 __up (sem);
83 }
85 #endif /* __V850_SEMAPHORE_H__ */