/* SPDX-License-Identifier: GPL-2.0 */
  #ifndef _ASM_GENERIC_ERROR_INJECTION_H
  #define _ASM_GENERIC_ERROR_INJECTION_H
  
  #if defined(__KERNEL__) && !defined(__ASSEMBLY__)

  enum {
  	EI_ETYPE_NONE,		/* Dummy value for undefined case */
  	EI_ETYPE_NULL,		/* Return NULL if failure */
  	EI_ETYPE_ERRNO,		/* Return -ERRNO if failure */
  	EI_ETYPE_ERRNO_NULL,	/* Return -ERRNO or NULL if failure */

  	EI_ETYPE_TRUE,		/* Return true if failure */

  };
  
  struct error_injection_entry {
  	unsigned long	addr;
  	int		etype;
  };

  struct pt_regs;

  #ifdef CONFIG_FUNCTION_ERROR_INJECTION
  /*
   * Whitelist ganerating macro. Specify functions which can be
   * error-injectable using this macro.
   */

  #define ALLOW_ERROR_INJECTION(fname, _etype)				\
  static struct error_injection_entry __used				\

  	__section("_error_injection_whitelist")				\

  	_eil_addr_##fname = {						\
  		.addr = (unsigned long)fname,				\
  		.etype = EI_ETYPE_##_etype,				\
  	};

  
  void override_function_with_return(struct pt_regs *regs);

  #else

  #define ALLOW_ERROR_INJECTION(fname, _etype)

  
  static inline void override_function_with_return(struct pt_regs *regs) { }

  #endif
  #endif
  
  #endif /* _ASM_GENERIC_ERROR_INJECTION_H */