Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols
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- Subject: Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols
- From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
- Date: Mon, 15 Feb 2021 09:58:06 -0600
- Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Xi Ruoyao <xry111@xxxxxxxxxxxxxxxx>, "# 3.4.x" <stable@xxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Miroslav Benes <mbenes@xxxxxxx>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <20210215095307.6f5fb12f@gandalf.local.home>
- References: <CAKwvOd=GHdkvAU3u6ROSgtGqC_wrkXo8siL1nZHE-qsqSx0gsw@mail.gmail.com> <YCafKVSTX9MxDBMd@kroah.com> <20210212170750.y7xtitigfqzpchqd@treble> <20210212124547.1dcf067e@gandalf.local.home> <YCfdfkoeh8i0baCj@kroah.com> <20210213091304.2dd51e5f@oasis.local.home> <20210213155203.lehuegwc3h42nebs@treble> <YCf9bnsmXqRGMn+j@kroah.com> <20210214155147.3owdimqv2lyhu6by@treble> <20210215095307.6f5fb12f@gandalf.local.home>
On Mon, Feb 15, 2021 at 09:53:07AM -0500, Steven Rostedt wrote:
> On Sun, 14 Feb 2021 09:51:47 -0600
> Josh Poimboeuf <jpoimboe@xxxxxxxxxx> 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?
The section is there, but the symbol associated with the section
(".text.unlikely" symbol) isn't generated by the assembler.
--
Josh
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