spin.h 1.5 KB

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  1. /*
  2. * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
  3. * All Rights Reserved.
  4. *
  5. * This program is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU General Public License as
  7. * published by the Free Software Foundation.
  8. *
  9. * This program is distributed in the hope that it would be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12. * GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write the Free Software Foundation,
  16. * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17. */
  18. #ifndef __XFS_SUPPORT_SPIN_H__
  19. #define __XFS_SUPPORT_SPIN_H__
  20. #include <linux/sched.h> /* preempt needs this */
  21. #include <linux/spinlock.h>
  22. /*
  23. * Map lock_t from IRIX to Linux spinlocks.
  24. *
  25. * We do not make use of lock_t from interrupt context, so we do not
  26. * have to worry about disabling interrupts at all (unlike IRIX).
  27. */
  28. typedef spinlock_t lock_t;
  29. #define SPLDECL(s) unsigned long s
  30. #ifndef DEFINE_SPINLOCK
  31. #define DEFINE_SPINLOCK(s) spinlock_t s = SPIN_LOCK_UNLOCKED
  32. #endif
  33. #define spinlock_init(lock, name) spin_lock_init(lock)
  34. #define spinlock_destroy(lock)
  35. #define mutex_spinlock(lock) ({ spin_lock(lock); 0; })
  36. #define mutex_spinunlock(lock, s) do { spin_unlock(lock); (void)s; } while (0)
  37. #define nested_spinlock(lock) spin_lock(lock)
  38. #define nested_spinunlock(lock) spin_unlock(lock)
  39. #endif /* __XFS_SUPPORT_SPIN_H__ */