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When CONFIG_DYNAMIC_FTRACE is not set, the function fgraph_update_pid_func() doesn't do anything. Currently, most of its logic is within a "#ifdef CONFIG_DYNAMIC_FTRACE" block, but its variables were declared outside that, and when DYNAMIC_FTRACE is not set, it produces unused variable warnings. Instead, just place it (and the helper function fgraph_pid_func()) within the #ifdef block and have the header file use a empty stub function for when DYNAMIC_FTRACE is not defined. Link: https://lore.kernel.org/linux-trace-kernel/20240607094833.6a787d73@rorschach.local.home Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202406071806.BRjaC5FF-lkp@intel.com/ Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
68 lines
2 KiB
C
68 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
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#define _LINUX_KERNEL_FTRACE_INTERNAL_H
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int __register_ftrace_function(struct ftrace_ops *ops);
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int __unregister_ftrace_function(struct ftrace_ops *ops);
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#ifdef CONFIG_FUNCTION_TRACER
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extern struct mutex ftrace_lock;
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extern struct ftrace_ops global_ops;
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#ifdef CONFIG_DYNAMIC_FTRACE
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int ftrace_startup(struct ftrace_ops *ops, int command);
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int ftrace_shutdown(struct ftrace_ops *ops, int command);
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int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
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int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
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int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command);
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#else /* !CONFIG_DYNAMIC_FTRACE */
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/* Keep as macros so we do not need to define the commands */
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# define ftrace_startup(ops, command) \
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({ \
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int ___ret = __register_ftrace_function(ops); \
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if (!___ret) \
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(ops)->flags |= FTRACE_OPS_FL_ENABLED; \
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___ret; \
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})
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# define ftrace_shutdown(ops, command) \
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({ \
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int ___ret = __unregister_ftrace_function(ops); \
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if (!___ret) \
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(ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
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___ret; \
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})
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static inline int
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ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
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{
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return 1;
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}
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static inline int ftrace_startup_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
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{
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return -EINVAL;
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}
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static inline int ftrace_shutdown_subops(struct ftrace_ops *ops, struct ftrace_ops *subops, int command)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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extern int ftrace_graph_active;
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# ifdef CONFIG_DYNAMIC_FTRACE
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extern void fgraph_update_pid_func(void);
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# else
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static inline void fgraph_update_pid_func(void) {}
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# endif
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#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
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# define ftrace_graph_active 0
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static inline void fgraph_update_pid_func(void) {}
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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#else /* !CONFIG_FUNCTION_TRACER */
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#endif /* CONFIG_FUNCTION_TRACER */
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#endif
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