linux-kernel - Re: [v8,02/12] objtool: Allow alternatives to be ignored

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Date:   Mon, 22 Jan 2018 20:27:05 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        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>, tglx@...utronix.de,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk,
        x86@...nel.org, thomas.lendacky@....com
Subject: Re: [v8,02/12] objtool: Allow alternatives to be ignored

On Mon, 2018-01-22 at 12:25 -0800, Guenter Roeck wrote:
> 
> It uses "-mindirect-branch=thunk -mindirect-branch-loop=pause
> -fno-jump-tables", though I don't know if that even exists in
> upstream gcc (it is the gcc use for Chrome OS builds). I'll pass
> your feedback to our compiler team.

We moved on from that and the upstream retpoline support in the kernel
won't recognise it.

> Either case, I think it is less than optimal that objtool crashes
> with _any_ object code.

Yeah, I'll give you that one :)
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