v2.4.8 -> v2.4.8.1
[opensuse:kernel.git] / include / asm-arm / smplock.h
1 /*
2  * <asm/smplock.h>
3  *
4  * Default SMP lock implementation
5  */
6 #include <linux/interrupt.h>
7 #include <linux/spinlock.h>
8
9 extern spinlock_t kernel_flag;
10
11 #define kernel_locked()         spin_is_locked(&kernel_flag)
12
13 /*
14  * Release global kernel lock and global interrupt lock
15  */
16 #define release_kernel_lock(task, cpu) \
17 do { \
18         if (task->lock_depth >= 0) \
19                 spin_unlock(&kernel_flag); \
20         release_irqlock(cpu); \
21         __sti(); \
22 } while (0)
23
24 /*
25  * Re-acquire the kernel lock
26  */
27 #define reacquire_kernel_lock(task) \
28 do { \
29         if (task->lock_depth >= 0) \
30                 spin_lock(&kernel_flag); \
31 } while (0)
32
33
34 /*
35  * Getting the big kernel lock.
36  *
37  * This cannot happen asynchronously,
38  * so we only need to worry about other
39  * CPU's.
40  */
41 static inline void lock_kernel(void)
42 {
43         if (!++current->lock_depth)
44                 spin_lock(&kernel_flag);
45 }
46
47 static inline void unlock_kernel(void)
48 {
49         if (--current->lock_depth < 0)
50                 spin_unlock(&kernel_flag);
51 }