ERROR: ftrace_graph_ret_addr" [arch/x86/oprofile/oprofile.ko] undefined!

[Karl Beldan]

Hi,

This has already been reported by Fengguang Wu's kbuild test robot:
https://lists.01.org/pipermail/kbuild-all/2016-July/022203.html
but it seems to have slipped through.
 
Karl