#ifndef __ASM_GENERIC_SPINLOCK_H
  #define __ASM_GENERIC_SPINLOCK_H
  /*
   * You need to implement asm/spinlock.h for SMP support. The generic
   * version does not handle SMP.
   */
  #ifdef CONFIG_SMP
  #error need an architecture specific asm/spinlock.h
  #endif
  
  #endif /* __ASM_GENERIC_SPINLOCK_H */