linux/kernel/trace/ftrace_internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
#define _LINUX_KERNEL_FTRACE_INTERNAL_H

int __register_ftrace_function(struct ftrace_ops *ops);
int __unregister_ftrace_function(struct ftrace_ops *ops);

#ifdef CONFIG_FUNCTION_TRACER

extern struct mutex ftrace_lock;
extern struct ftrace_ops global_ops;

#ifdef CONFIG_DYNAMIC_FTRACE

int ftrace_startup(struct ftrace_ops *ops, int command);
int ftrace_shutdown(struct ftrace_ops *ops, int command);
int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);

#else /* !CONFIG_DYNAMIC_FTRACE */

/* Keep as macros so we do not need to define the commands */
#define ftrace_startup …
#define ftrace_shutdown …
static inline int
ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
{
	return 1;
}
static inline int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
{
	return -EINVAL;
}
static inline int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
{
	return -EINVAL;
}
#endif /* CONFIG_DYNAMIC_FTRACE */

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern int ftrace_graph_active;
# ifdef CONFIG_DYNAMIC_FTRACE
extern void fgraph_update_pid_func(void);
# else
static inline void fgraph_update_pid_func(void) {}
# endif
#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
#define ftrace_graph_active …
static inline void fgraph_update_pid_func(void) {}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

#else /* !CONFIG_FUNCTION_TRACER */
#endif /* CONFIG_FUNCTION_TRACER */

#endif