fs/xfs/linux-2.6/spin.h

   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
  21 #include <linux/sched.h>        /* preempt needs this */
  22 #include <linux/spinlock.h>
  23
  24 /*
  25  * Map lock_t from IRIX to Linux spinlocks.
  26  *
  27  * We do not make use of lock_t from interrupt context, so we do not
  28  * have to worry about disabling interrupts at all (unlike IRIX).
  29  */
  30
  31 typedef spinlock_t lock_t;
  32
  33 #define SPLDECL(s)                      unsigned long s
  34 #ifndef DEFINE_SPINLOCK
  35 #define DEFINE_SPINLOCK(s)              spinlock_t s = SPIN_LOCK_UNLOCKED
  36 #endif
  37
  38 #define spinlock_init(lock, name)       spin_lock_init(lock)
  39 #define spinlock_destroy(lock)
  40 #define mutex_spinlock(lock)            ({ spin_lock(lock); 0; })
  41 #define mutex_spinunlock(lock, s)       do { spin_unlock(lock); (void)s; } while (0)
  42 #define nested_spinlock(lock)           spin_lock(lock)
  43 #define nested_spinunlock(lock)         spin_unlock(lock)
  44
  45 #endif /* __XFS_SUPPORT_SPIN_H__ */