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__) 6enum { 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 13struct error_injection_entry { 14 unsigned long addr; 15 int etype; 16}; 17 18struct 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) \ 28static 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 35void override_function_with_return(struct pt_regs *regs); 36#else 37#define ALLOW_ERROR_INJECTION(fname, _etype) 38 39static inline void override_function_with_return(struct pt_regs *regs) { } 40#endif 41#endif 42 43#endif /* _ASM_GENERIC_ERROR_INJECTION_H */ 44