/* Fallback per-CPU frame pointer holder
   *
   * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  #ifndef _ASM_GENERIC_IRQ_REGS_H
  #define _ASM_GENERIC_IRQ_REGS_H
  
  #include <linux/percpu.h>
  
  /*
   * Per-cpu current frame pointer - the location of the last exception frame on
   * the stack
   */
  DECLARE_PER_CPU(struct pt_regs *, __irq_regs);
  
  static inline struct pt_regs *get_irq_regs(void)
  {
  	return __this_cpu_read(__irq_regs);
  }
  
  static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
  {
  	struct pt_regs *old_regs;
  
  	old_regs = __this_cpu_read(__irq_regs);
  	__this_cpu_write(__irq_regs, new_regs);
  	return old_regs;
  }
  
  #endif /* _ASM_GENERIC_IRQ_REGS_H */