linux-kernel - Re: 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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Message-ID: <20170706143139.x5skvenbasvjj7rz@treble>
Date:   Thu, 6 Jul 2017 09:31:39 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Mike Galbraith <efault@....de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: arch/x86/kernel/ftrace.o: warning: objtool:
 ftrace_modify_code_direct()+0x2d: sibling call from callable instruction
 with modified stack frame

On Thu, Jul 06, 2017 at 04:09:18PM +0200, Mike Galbraith wrote:
> 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.

Thanks, looks like an objtool bug.  Will fix.

-- 
Josh