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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _ASM_GENERIC_ERROR_INJECTION_H3#define _ASM_GENERIC_ERROR_INJECTION_H4 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_INJECTION21/*22 * Whitelist generating macro. Specify functions which can be error-injectable23 * using this macro. If you unsure what is required for the error-injectable24 * functions, please read Documentation/fault-injection/fault-injection.rst25 * '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#else37#define ALLOW_ERROR_INJECTION(fname, _etype)38 39static inline void override_function_with_return(struct pt_regs *regs) { }40#endif41#endif42 43#endif /* _ASM_GENERIC_ERROR_INJECTION_H */44