arch/x86/kernel/ftrace.o: warning: objtool: ftrace_modify_code_direct()+0x2d: sibling call from callable instruction with modified stack frame

[Mike Galbraith]

Greetings,

I'm seeing $subject in master as of this merge window.  I don't see it
with my usual stripped down PREEMPT_VOLUNTARY or an enterprise-ish
NOPREEMPT config, but do see it with the attached, derived from my
enterprise-ish PREEMPT_RT config after running make oldconfig on it,
and reproducing the warning in virgin source.

        -Mike

config.xz
Description: application/xz