LXR linux-old/include/asm-ia64/smplock.h

   1/*
   2 * <asm/smplock.h>
   3 *
   4 * Default SMP lock implementation
   5 */
   6#include <linux/interrupt.h>
   7#include <linux/spinlock.h>
   8#include <linux/sched.h>
   9
  10#include <asm/current.h>
  11#include <asm/hardirq.h>
  12
  13extern spinlock_t kernel_flag;
  14
  15#define kernel_locked()         spin_is_locked(&kernel_flag)
  16
  17/*
  18 * Release global kernel lock and global interrupt lock
  19 */
  20static __inline__ void
  21release_kernel_lock(struct task_struct *task, int cpu)
  22{
  23        if (task->lock_depth >= 0)
  24                spin_unlock(&kernel_flag);
  25        release_irqlock(cpu);
  26        __sti();
  27}
  28
  29/*
  30 * Re-acquire the kernel lock
  31 */
  32static __inline__ void
  33reacquire_kernel_lock(struct task_struct *task)
  34{
  35        if (task->lock_depth >= 0)
  36                spin_lock(&kernel_flag);
  37}
  38
  39/*
  40 * Getting the big kernel lock.
  41 *
  42 * This cannot happen asynchronously,
  43 * so we only need to worry about other
  44 * CPU's.
  45 */
  46static __inline__ void
  47lock_kernel(void)
  48{
  49        if (!++current->lock_depth)
  50                spin_lock(&kernel_flag);
  51}
  52
  53static __inline__ void
  54unlock_kernel(void)
  55{
  56        if (--current->lock_depth < 0)
  57                spin_unlock(&kernel_flag);
  58}
  59