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ftrace: Add :mod: caching infrastructure to trace_array
This is the start of the infrastructure work to allow for tracing module functions before it is loaded. Currently the following command: # echo :mod:some-mod > set_ftrace_filter will enable tracing of all functions within the module "some-mod" if it is loaded. What we want, is if the module is not loaded, that line will be saved. When the module is loaded, then the "some-mod" will have that line executed on it, so that the functions within it starts being traced. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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