On Tue, 2018-01-23 at 16:42 +0100, Peter Zijlstra wrote:
> drivers/watchdog/.tmp_hpwdt.o: warning: objtool: .text+0x24: indirect call found in RETPOLINE build

You're calling into BIOS there. Not a lot of point in protecting that
one. This is one of the cases where we were saying you needed to turn
on IBRS to have complete protection, even with retpoline.