linux-kernel - Re: [PATCH 2/3] objtool: Ignore retpoline alternatives

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Message-ID: <nycvar.YFH.7.76.1801111757410.11852@cbobk.fhfr.pm>
Date:   Thu, 11 Jan 2018 18:01:23 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     David Woodhouse <dwmw2@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH 2/3] objtool: Ignore retpoline alternatives

On Thu, 11 Jan 2018, Josh Poimboeuf wrote:

> I think I heard that retpolines won't be ported to anything older than 
> GCC 4.9, so maybe it's safe to use '%='.  I don't remember when it was 
> introduced into GCC though.

I'm afraid we'll have to backport retpolines in some form to 4.3.x at 
least. I'd be surprised if we'd be the only ones on this planet :)

-- 
Jiri Kosina
SUSE Labs