1 /*
2 * <asm/smplock.h>
3 *
4 * Default SMP lock implementation
5 */
6 #ifndef _ASM_SMPLOCK_H
7 #define _ASM_SMPLOCK_H
8
9 #include <linux/sched.h>
10 #include <linux/interrupt.h>
11 #include <linux/spinlock.h>
12
13 extern spinlock_t kernel_flag;
14
15 #define kernel_locked() spin_is_locked(&kernel_flag)
16
17 /*
18 * Release global kernel lock and global interrupt lock
19 */
20 static __inline__ void release_kernel_lock(struct task_struct *task, int cpu)
21 {
22 if (task->lock_depth >= 0)
23 spin_unlock(&kernel_flag);
24 release_irqlock(cpu);
25 __sti();
26 }
27
28 /*
29 * Re-acquire the kernel lock
30 */
31 static __inline__ void reacquire_kernel_lock(struct task_struct *task)
32 {
33 if (task->lock_depth >= 0)
34 spin_lock(&kernel_flag);
35 }
36
37 /*
38 * Getting the big kernel lock.
39 *
40 * This cannot happen asynchronously,
41 * so we only need to worry about other
42 * CPU's.
43 */
44 static __inline__ void lock_kernel(void)
45 {
46 if (!++current->lock_depth)
47 spin_lock(&kernel_flag);
48 }
49
50 static __inline__ void unlock_kernel(void)
51 {
52 if (--current->lock_depth < 0)
53 spin_unlock(&kernel_flag);
54 }
55
56 #endif /* _ASM_SMPLOCK_H */
57
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