[PATCH v3 5/9] tracing: add 'stacktrace' event trigger command

Add 'stacktrace' ftrace_func_command. stacktrace event triggers are added by the user via this command in a similar way and using practically the same syntax as the analogous 'stacktrace' ftrace function command, but instead of writing to the set_ftrace_filter file, the stacktrace event trigger

[PATCH v3 5/9] tracing: add 'stacktrace' event trigger command

Add 'stacktrace' ftrace_func_command. stacktrace event triggers are added by the user via this command in a similar way and using practically the same syntax as the analogous 'stacktrace' ftrace function command, but instead of writing to the set_ftrace_filter file, the stacktrace event trigger