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 <linux/spinlock.h>
11
12extern spinlock_t kernel_flag;
13
14#define kernel_locked()                spin_is_locked(&kernel_flag)
15
16/*
17 * Release global kernel lock and global interrupt lock
18 */
19#define release_kernel_lock(task, cpu)     \
20do {                                       \
21	if (task->lock_depth >= 0)         \
22		spin_unlock(&kernel_flag); \
23	release_irqlock(cpu);              \
24	__sti();                           \
25} while (0)
26
27/*
28 * Re-acquire the kernel lock
29 */
30#define reacquire_kernel_lock(task)        \
31do {                                       \
32	if (task->lock_depth >= 0)         \
33		spin_lock(&kernel_flag);   \
34} while (0)
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/*
45 * Getting the big kernel lock.
46 *
47 * This cannot happen asynchronously,
48 * so we only need to worry about other
49 * CPU's.
50 */
51extern __inline__ void lock_kernel(void)
52{
53        if (!++current->lock_depth)
54                spin_lock(&kernel_flag);
55}
56
57extern __inline__ void unlock_kernel(void)
58{
59        if (--current->lock_depth < 0)
60                spin_unlock(&kernel_flag);
61}
62
63