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Debugging, Tracing, and Profiling
The tracepoint header file in meta-bsp-custom/recipes-kernel/hello-worldtracepoint/files/trace.h would be:
#undef TRACE_SYSTEM
#define TRACE_SYSTEM log_dbg
#if !defined(_HELLOWORLD_TRACE) || defined(TRACE_HEADER_MULTI_READ)
#define _HELLOWORLD_TRACE
#include <linux/tracepoint.h>
TRACE_EVENT(log_dbg,
TP_PROTO(char *a, char *b),
TP_ARGS(a, b),
TP_STRUCT__entry(
__string(a, a)
__string(b, b)),
TP_fast_assign(
__assign_str(a, a);
__assign_str(b, b);),
TP_printk("log_dbg: a %s b %s",
__get_str(a), __get_str(b))
);
#endif
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>
And the module's Makefile file in meta-bsp-custom/recipes-kernel/hello-worldtracepoint/files/Makefile would look as follows:
obj-m
:= hello_world.o
CFLAGS_hello_world.o
+= -I$(src)
SRC := $(shell pwd)
all:
$(MAKE) -C "$(KERNEL_SRC)" M="$(SRC)"
modules_install:
242