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 extern __inline__ void lock_kernel(void)
42 {
43 if (!++current->lock_depth)
44 spin_lock(&kernel_flag);
45 }
46
47 extern __inline__ void unlock_kernel(void)
48 {
49 if (--current->lock_depth < 0)
50 spin_unlock(&kernel_flag);
51 }
52
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