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/*
* <asm/smplock.h>
*
* Default SMP lock implementation
*/
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
extern spinlock_t kernel_flag;
#define kernel_locked() \
(spin_is_locked(&kernel_flag) &&\
(current->lock_depth >= 0))
/*
* Release global kernel lock and global interrupt lock
*/
#define release_kernel_lock(task, cpu) \
do { \
if (task->lock_depth >= 0) \
spin_unlock(&kernel_flag); \
release_irqlock(cpu); \
__sti(); \
} while (0)
/*
* Re-acquire the kernel lock
*/
#define reacquire_kernel_lock(task) \
do { \
if (task->lock_depth >= 0) \
spin_lock(&kernel_flag); \
} while (0)
/*
* Getting the big kernel lock.
*
* This cannot happen asynchronously,
* so we only need to worry about other
* CPU's.
*/
#define lock_kernel() \
do { \
if (!++current->lock_depth) \
spin_lock(&kernel_flag); \
} while(0)
#define unlock_kernel() \
do { \
if (--current->lock_depth < 0) \
spin_unlock(&kernel_flag); \
} while(0)
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