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

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Date:   Thu, 06 Jul 2017 16:09:18 +0200
From:   Mike Galbraith <efault@....de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: arch/x86/kernel/ftrace.o: warning: objtool:
 ftrace_modify_code_direct()+0x2d: sibling call from callable instruction
 with modified stack frame

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
Download attachment "config.xz" of type "application/x-xz" (37728 bytes)