include/asm-sparc/smplock.h

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 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 /*
 12  * Release global kernel lock and global interrupt lock
 13  */
 14 #define release_kernel_lock(task, cpu) \
 15 do { \
 16  if (task->lock_depth >= 0) \
 17  spin_unlock(&kernel_flag); \
 18  release_irqlock(cpu); \
 19  __sti(); \
 20 } while (0)
 21
 22 /*
 23  * Re-acquire the kernel lock
 24  */
 25 #define reacquire_kernel_lock(task) \
 26 do { \
 27  if (task->lock_depth >= 0) \
 28  spin_lock(&kernel_flag); \
 29 } while (0)
 30
 31
 32 /*
 33  * Getting the big kernel lock.
 34  *
 35  * This cannot happen asynchronously,
 36  * so we only need to worry about other
 37  * CPU's.
 38  */
 39 extern __inline__ voidlock_kernel(void)
 40 {
 41 if(!++current->lock_depth)
 42 spin_lock(&kernel_flag);
 43 }
 44
 45 extern __inline__ voidunlock_kernel(void)
 46 {
 47 if(--current->lock_depth <0)
 48 spin_unlock(&kernel_flag);
 49 }