tree c8647ae1bc4519649e35e46b231f3f2af77f9a76
parent a3cd613b2e775eb59816c2c7c49c038d54917208
author Michal Simek <monstr@monstr.eu> 1258360814 +0100
committer Michal Simek <monstr@monstr.eu> 1260776409 +0100

microblaze: ftrace: add static function tracer

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>