linux-kernel - Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols

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Message-ID: <20210215095307.6f5fb12f@gandalf.local.home>
Date:   Mon, 15 Feb 2021 09:53:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Xi Ruoyao <xry111@...gyan1223.wang>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang
 non-section symbols

On Sun, 14 Feb 2021 09:51:47 -0600
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> Steve, looks like recordmcount avoids referencing weak symbols directly
> by their function symbol.  Maybe it can just skip weak symbols which
> don't have a section symbol, since this seems like a rare scenario.

When does the .text.unlikely section disappear? During the creation of the
object, or later in the linker stage?

-- Steve