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