linux-kernel - Re: [RFC][PATCH 2/3] objtool: Find relocation base section using sh

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Message-ID: <20200528160247.GW9040@rlwimi.vmware.com>
Date:   Thu, 28 May 2020 09:02:47 -0700
From:   Matt Helsley <mhelsley@...are.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
CC:     <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC][PATCH 2/3] objtool: Find relocation base section using
 sh_info

On Thu, May 28, 2020 at 09:09:16AM -0500, Josh Poimboeuf wrote:
> On Wed, May 27, 2020 at 09:42:32AM -0700, Matt Helsley wrote:
> > Currently objtool uses a naming heuristic to find the "base"
> > section to apply the relocation(s) to. The standard defines
> > the SHF_INFO_LINK flag (SHF => in the section header flags)
> > which indicates when the section header's sh_info field can
> > be used to find the necessary section.
> > 
> > Warns when the heuristic is used as a fallback and changes
> > the name heuristic calculation to handle rela (explicit
> > addend) and now rel (implicit addend) relocations.
> 
> Does this fallback case actually happen?

Not that I could see. I was thinking about taking it out but
I haven't tried this set with clang or other toolchains. So
I was wondering if you think holding off before removing it
would be wise or if you'd rather just remove it.

Cheers,
    -Matt Helsley