function_graph selftest fails with !DYNAMIC

[Rabin Vincent]

The function_graph selftest fails when CONFIG_DYNAMIC_FTRACE is not set
(tested on x86-64) on current kernels:

[    0.300124] Testing tracer function: PASSED
[    0.446092] Testing tracer function_graph: .. no entries found ..FAILED!

Bisecting goes back to this commit:

2b499381bc50ede01b3d8eab164ca2fad00655f0 is the first bad commit
commit 2b499381bc50ede01b3d8eab164ca2fad00655f0
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
Date:   Tue May 3 22:49:52 2011 -0400

    ftrace: Have global_ops store the functions that are to be traced
    
    This is a step towards each ops structure defining its own set
    of functions to trace. As the current code with pid's and such
    are specific to the global_ops, it is restructured to be used
    with the global ops.
    
    Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

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