include/asm-generic/error-injection.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_GENERIC_ERROR_INJECTION_H
   3 #define _ASM_GENERIC_ERROR_INJECTION_H
   4
   5 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
   6 enum {
   7         EI_ETYPE_NULL,          /* Return NULL if failure */
   8         EI_ETYPE_ERRNO,         /* Return -ERRNO if failure */
   9         EI_ETYPE_ERRNO_NULL,    /* Return -ERRNO or NULL if failure */
  10         EI_ETYPE_TRUE,          /* Return true if failure */
  11 };
  12
  13 struct error_injection_entry {
  14         unsigned long   addr;
  15         int             etype;
  16 };
  17
  18 struct pt_regs;
  19
  20 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
  21 /*
  22  * Whitelist generating macro. Specify functions which can be error-injectable
  23  * using this macro. If you unsure what is required for the error-injectable
  24  * functions, please read Documentation/fault-injection/fault-injection.rst
  25  * 'Error Injectable Functions' section.
  26  */
  27 #define ALLOW_ERROR_INJECTION(fname, _etype)                            \
  28 static struct error_injection_entry __used                              \
  29         __section("_error_injection_whitelist")                         \
  30         _eil_addr_##fname = {                                           \
  31                 .addr = (unsigned long)fname,                           \
  32                 .etype = EI_ETYPE_##_etype,                             \
  33         }
  34
  35 void override_function_with_return(struct pt_regs *regs);
  36 #else
  37 #define ALLOW_ERROR_INJECTION(fname, _etype)
  38
  39 static inline void override_function_with_return(struct pt_regs *regs) { }
  40 #endif
  41 #endif
  42
  43 #endif /* _ASM_GENERIC_ERROR_INJECTION_H */