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 /*
12 * Release global kernel lock and global interrupt lock
13 */
14 #define release_kernel_lock(task, cpu) \
15 do { \
16 if (task->lock_depth >= 0) \
17 spin_unlock(&kernel_flag); \
18 release_irqlock(cpu); \
19 __sti(); \
20 } while (0)
21
22 /*
23 * Re-acquire the kernel lock
24 */
25 #define reacquire_kernel_lock(task) \
26 do { \
27 if (task->lock_depth >= 0) \
28 spin_lock(&kernel_flag); \
29 } while (0)
30
31
32 /*
33 * Getting the big kernel lock.
34 *
35 * This cannot happen asynchronously,
36 * so we only need to worry about other
37 * CPU's.
38 */
39 extern __inline__ void lock_kernel(void)
40 {
41 if (!++current->lock_depth)
42 spin_lock(&kernel_flag);
43 }
44
45 extern __inline__ void unlock_kernel(void)
46 {
47 if (--current->lock_depth < 0)
48 spin_unlock(&kernel_flag);
49 }
50
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