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With dynamic function tracer, by default, _mcount is defined as an "empty" function, it returns directly without any more action. When enabling it in user-space, it will jump to a real tracing function(ftrace_caller), and do the real job for us. Differ from the static function tracer, dynamic function tracer provides two functions ftrace_make_call()/ftrace_make_nop() to enable/disable the tracing of some indicated kernel functions(set_ftrace_filter). In the kernel version, there is only one "_mcount" string for every kernel function, so, we just need to match this one in mcount_regex of scripts/recordmcount.pl. For more information please look at code and Documentation/trace folder. Steven ACK that scripts/recordmcount.pl part. Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Michal Simek <monstr@monstr.eu>
33 lines
852 B
Makefile
33 lines
852 B
Makefile
#
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# Makefile
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#
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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace early boot code and low level code
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CFLAGS_REMOVE_timer.o = -pg
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CFLAGS_REMOVE_intc.o = -pg
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CFLAGS_REMOVE_early_printk.o = -pg
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CFLAGS_REMOVE_selfmod.o = -pg
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CFLAGS_REMOVE_heartbeat.o = -pg
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CFLAGS_REMOVE_ftrace.o = -pg
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endif
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extra-y := head.o vmlinux.lds
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obj-y += exceptions.o \
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hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
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of_platform.o process.o prom.o prom_parse.o ptrace.o \
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setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
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obj-y += cpu/
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_SELFMOD) += selfmod.o
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obj-$(CONFIG_HEART_BEAT) += heartbeat.o
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obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o
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obj-$(CONFIG_MMU) += misc.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount.o
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obj-y += entry$(MMU).o
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