4 * Default SMP lock implementation
6 #include <linux/interrupt.h>
7 #include <linux/spinlock.h>
9 extern spinlock_t kernel_flag
;
11 #define kernel_locked() spin_is_locked(&kernel_flag)
14 * Release global kernel lock and global interrupt lock
16 #define release_kernel_lock(task, cpu) \
18 if (task->lock_depth >= 0) \
19 spin_unlock(&kernel_flag); \
20 release_irqlock(cpu); \
25 * Re-acquire the kernel lock
27 #define reacquire_kernel_lock(task) \
29 if (task->lock_depth >= 0) \
30 spin_lock(&kernel_flag); \
35 * Getting the big kernel lock.
37 * This cannot happen asynchronously,
38 * so we only need to worry about other
41 extern __inline__
void lock_kernel(void)
43 if (!++current
->lock_depth
)
44 spin_lock(&kernel_flag
);
47 extern __inline__
void unlock_kernel(void)
49 if (--current
->lock_depth
< 0)
50 spin_unlock(&kernel_flag
);