linux-kernel - Re: objtool warnings for kernel/trace/trace_selftest

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Message-ID: <20181218212239.GF25620@tassilo.jf.intel.com>
Date:   Tue, 18 Dec 2018 13:22:39 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Miroslav Benes <mbenes@...e.cz>
Subject: Re: objtool warnings for kernel/trace/trace_selftest_dynamic.o

On Tue, Dec 18, 2018 at 10:19:32AM +0100, Peter Zijlstra wrote:
> On Mon, Dec 17, 2018 at 03:59:50PM -0800, Andi Kleen wrote:
> > BTW I have a user base for LTO and so far noone has reported any issues
> > like this.
> 
> Because ordering issues are immediately obvious and easy to debug no
> doubt.

Again if it's a real problem it should be already there 
because we have a lot of code inside files that gets happily inlined.

Do you have an example in the tree where it happened or could happen?


-Andi