ftrace: Check for empty hash and comment the race with registering probes
The race between adding a function probe and reading the probes that exist is very subtle. It needs a comment. Also, the issue can also happen if the probe has has the EMPTY_HASH as its func_hash. Cc: stable@vger.kernel.org Fixes: 7b60f3d8 ("ftrace: Dynamically create the probe ftrace_ops for the trace_array") Signed-off-by:Steven Rostedt (VMware) <rostedt@goodmis.org>
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7bd46644
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