#ifndef _ASM_GENERIC_TRACE_CLOCK_H
  #define _ASM_GENERIC_TRACE_CLOCK_H
  /*
   * Arch-specific trace clocks.
   */
  
  /*
   * Additional trace clocks added to the trace_clocks
   * array in kernel/trace/trace.c
   * None if the architecture has not defined it.
   */
  #ifndef ARCH_TRACE_CLOCKS
  # define ARCH_TRACE_CLOCKS
  #endif
  
  #endif  /* _ASM_GENERIC_TRACE_CLOCK_H */