linux-kernel - Re: [PATCH] recordmcount: support >64k sections

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Message-ID: <20200423184716.GA257363@google.com>
Date:   Thu, 23 Apr 2020 11:47:16 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Matt Helsley <mhelsley@...are.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] recordmcount: support >64k sections

On Wed, Apr 22, 2020 at 08:05:32PM -0400, Steven Rostedt wrote:
> On Wed, 22 Apr 2020 16:24:17 -0700
> Sami Tolvanen <samitolvanen@...gle.com> wrote:
> 
> > When compiling a kernel with Clang and LTO, we need to run
> > recordmcount on vmlinux.o with a large number of sections, which
> > currently fails as the program doesn't understand extended
> > section indexes. This change adds support for processing binaries
> > with >64k sections.
> 
> Thanks! As you have also Cc'd Matt Helsley, perhaps you have noticed we
> are trying to get this code merged with objtool.
> 
> How would that affect this?

Yes, I saw the patches. If you are copying over code, a similar fix
might be needed, but otherwise I don't see any issues. I also sent a
patch for objtool a couple of days ago to support >64k sections:

  https://lore.kernel.org/lkml/20200421220843.188260-2-samitolvanen@google.com/

Sami