LXR linux/include/linux/spinlock_api

   1#ifndef __LINUX_SPINLOCK_API_UP_H
   2#define __LINUX_SPINLOCK_API_UP_H
   3
   4#ifndef __LINUX_SPINLOCK_H
   5# error "please don't include this file directly"
   6#endif
   7
   8/*
   9 * include/linux/spinlock_api_up.h
  10 *
  11 * spinlock API implementation on UP-nondebug (inlined implementation)
  12 *
  13 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  14 * Released under the General Public License (GPL).
  15 */
  16
  17#define in_lock_functions(ADDR)         0
  18
  19#define assert_spin_locked(lock)        do { (void)(lock); } while (0)
  20
  21/*
  22 * In the UP-nondebug case there's no real locking going on, so the
  23 * only thing we have to do is to keep the preempt counts and irq
  24 * flags straight, to suppress compiler warnings of unused lock
  25 * variables, and to add the proper checker annotations:
  26 */
  27#define __LOCK(lock) \
  28  do { preempt_disable(); __acquire(lock); (void)(lock); } while (0)
  29
  30#define __LOCK_BH(lock) \
  31  do { local_bh_disable(); __LOCK(lock); } while (0)
  32
  33#define __LOCK_IRQ(lock) \
  34  do { local_irq_disable(); __LOCK(lock); } while (0)
  35
  36#define __LOCK_IRQSAVE(lock, flags) \
  37  do { local_irq_save(flags); __LOCK(lock); } while (0)
  38
  39#define __UNLOCK(lock) \
  40  do { preempt_enable(); __release(lock); (void)(lock); } while (0)
  41
  42#define __UNLOCK_BH(lock) \
  43  do { preempt_enable_no_resched(); local_bh_enable(); __release(lock); (void)(lock); } while (0)
  44
  45#define __UNLOCK_IRQ(lock) \
  46  do { local_irq_enable(); __UNLOCK(lock); } while (0)
  47
  48#define __UNLOCK_IRQRESTORE(lock, flags) \
  49  do { local_irq_restore(flags); __UNLOCK(lock); } while (0)
  50
  51#define _spin_lock(lock)                        __LOCK(lock)
  52#define _spin_lock_nested(lock, subclass)       __LOCK(lock)
  53#define _read_lock(lock)                        __LOCK(lock)
  54#define _write_lock(lock)                       __LOCK(lock)
  55#define _spin_lock_bh(lock)                     __LOCK_BH(lock)
  56#define _read_lock_bh(lock)                     __LOCK_BH(lock)
  57#define _write_lock_bh(lock)                    __LOCK_BH(lock)
  58#define _spin_lock_irq(lock)                    __LOCK_IRQ(lock)
  59#define _read_lock_irq(lock)                    __LOCK_IRQ(lock)
  60#define _write_lock_irq(lock)                   __LOCK_IRQ(lock)
  61#define _spin_lock_irqsave(lock, flags)         __LOCK_IRQSAVE(lock, flags)
  62#define _read_lock_irqsave(lock, flags)         __LOCK_IRQSAVE(lock, flags)
  63#define _write_lock_irqsave(lock, flags)        __LOCK_IRQSAVE(lock, flags)
  64#define _spin_trylock(lock)                     ({ __LOCK(lock); 1; })
  65#define _read_trylock(lock)                     ({ __LOCK(lock); 1; })
  66#define _write_trylock(lock)                    ({ __LOCK(lock); 1; })
  67#define _spin_trylock_bh(lock)                  ({ __LOCK_BH(lock); 1; })
  68#define _spin_unlock(lock)                      __UNLOCK(lock)
  69#define _read_unlock(lock)                      __UNLOCK(lock)
  70#define _write_unlock(lock)                     __UNLOCK(lock)
  71#define _spin_unlock_bh(lock)                   __UNLOCK_BH(lock)
  72#define _write_unlock_bh(lock)                  __UNLOCK_BH(lock)
  73#define _read_unlock_bh(lock)                   __UNLOCK_BH(lock)
  74#define _spin_unlock_irq(lock)                  __UNLOCK_IRQ(lock)
  75#define _read_unlock_irq(lock)                  __UNLOCK_IRQ(lock)
  76#define _write_unlock_irq(lock)                 __UNLOCK_IRQ(lock)
  77#define _spin_unlock_irqrestore(lock, flags)    __UNLOCK_IRQRESTORE(lock, flags)
  78#define _read_unlock_irqrestore(lock, flags)    __UNLOCK_IRQRESTORE(lock, flags)
  79#define _write_unlock_irqrestore(lock, flags)   __UNLOCK_IRQRESTORE(lock, flags)
  80
  81#endif /* __LINUX_SPINLOCK_API_UP_H */
  82