1 /*
2 * include/asm-s390/smplock.h
3 *
4 * S390 version
5 *
6 * Derived from "include/asm-i386/smplock.h"
7 */
8
9 #include <linux/interrupt.h>
10 #include <asm/spinlock.h>
11
12 extern spinlock_t kernel_flag;
13
14 /*
15 * Release global kernel lock and global interrupt lock
16 */
17 #define release_kernel_lock(task, cpu) \
18 do { \
19 if (task->lock_depth >= 0) \
20 spin_unlock(&kernel_flag); \
21 release_irqlock(cpu); \
22 __sti(); \
23 } while (0)
24
25 /*
26 * Re-acquire the kernel lock
27 */
28 #define reacquire_kernel_lock(task) \
29 do { \
30 if (task->lock_depth >= 0) \
31 spin_lock(&kernel_flag); \
32 } while (0)
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 /*
43 * Getting the big kernel lock.
44 *
45 * This cannot happen asynchronously,
46 * so we only need to worry about other
47 * CPU's.
48 */
49 extern __inline__ void lock_kernel(void)
50 {
51 if (!++current->lock_depth)
52 spin_lock(&kernel_flag);
53 }
54
55 extern __inline__ void unlock_kernel(void)
56 {
57 if (--current->lock_depth < 0)
58 spin_unlock(&kernel_flag);
59 }
60
61
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