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Current File : /usr/lib/modules/6.8.0-45-generic/build/include/asm-generic/error-injection.h
/* 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_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 generating macro. Specify functions which can be error-injectable
 * using this macro. If you unsure what is required for the error-injectable
 * functions, please read Documentation/fault-injection/fault-injection.rst
 * 'Error Injectable Functions' section.
 */
#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 */

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