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 */ 44