linux-kernel - Re: [PATCH 0/8] livepatch: klp-convert tool

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Message-ID: <20171020120318.ly2ym7a34vhn7zmx@treble>
Date:   Fri, 20 Oct 2017 07:03:18 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     Joao Moreira <jmoreira@...e.de>, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org, mmarek@...e.cz, pmladek@...e.com,
        jikos@...e.cz, nstange@...e.de, jroedel@...e.de, matz@...e.de,
        khlebnikov@...dex-team.ru, jeyu@...nel.org
Subject: Re: [PATCH 0/8] livepatch: klp-convert tool

On Fri, Oct 20, 2017 at 10:51:40AM +0200, Miroslav Benes wrote:
> > But with klp-convert, there's no such documentation, because there's no
> > safe way to use it without other supplementary tooling which doesn't
> > exist.
> 
> True.
> 
> I don't know if I mentioned it before. There is -fdump-ipa-clones now in 
> GCC for dumping every clone operation GCC does.
> 
> https://github.com/marxin/kgraft-analysis-tool processes the dump and 
> extracts useful information for a symbol.

Thanks, that looks really nice.  I see that my GCC 7 has
-fdump-ipa-clones.

It would be great if we could integrate that script's functionality with
klp-convert somehow, such that it would warn if you're patching a
function or a relocation which is affected.

Or at least document how a human could do so.

-- 
Josh