Workstation/Player 15.5.0 tries to guess the right retpoline (Spectre)
related compiler command line options, resulting in objtool warnings like
warning: objtool: .text.__x86_indirect_thunk_rbp+0x0: unsupported intra-function call
warning: objtool: If this is a retpoline, please patch it in with alternatives and annotate
e.g. in vmmon-only/common/memtrack.o (but also many others).
This seems wrong; out-of-tree modules should be built with the same
compiler options that were used to build the kernel they are built against.
Distribution kernel devel packages usually make sure this is the way so let
them do their job.