2fd7c761a2
If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to _mcount will be inserted into each kernel function. so, there is a possibility to trace the kernel functions in _mcount. This patch add the specific _mcount support for static function tracing. by default, ftrace_trace_function is initialized as ftrace_stub(an empty function), so, the default _mcount will introduce very little overhead. after enabling ftrace in user-space, it will jump to a real tracing function and do static function tracing for us. Commit message from Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
12 lines
279 B
Makefile
12 lines
279 B
Makefile
#
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# Build the appropriate CPU version support
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#
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_cache.o = -pg
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endif
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EXTRA_CFLAGS += -DCPU_MAJOR=$(CPU_MAJOR) -DCPU_MINOR=$(CPU_MINOR) \
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-DCPU_REV=$(CPU_REV)
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obj-y += cache.o cpuinfo.o cpuinfo-pvr-full.o cpuinfo-static.o mb.o pvr.o
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