linux-kernel - Re: [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections

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Message-Id: <20210205160034.a0e0ba06752bef03e60f91f8@linux-foundation.org>
Date:   Fri, 5 Feb 2021 16:00:34 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org,
        Jakub Jelinek <jakub@...hat.com>,
        Fangrui Song <maskray@...gle.com>,
        Caroline Tice <cmtice@...gle.com>,
        Nick Clifton <nickc@...hat.com>, Yonghong Song <yhs@...com>,
        Jiri Olsa <jolsa@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Chris Murphy <bugzilla@...orremedies.com>,
        Mark Wielaard <mark@...mp.org>, stable@...r.kernel.org,
        Chris Murphy <lists@...orremedies.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections

On Fri,  5 Feb 2021 12:22:18 -0800 Nick Desaulniers <ndesaulniers@...gle.com> wrote:

> We expect toolchains to produce these new debug info sections as part of
> DWARF v5. Add explicit placements to prevent the linker warnings from
> --orphan-section=warn.
> 
> Compilers may produce such sections with explicit -gdwarf-5, or based on
> the implicit default version of DWARF when -g is used via DEBUG_INFO.
> This implicit default changes over time, and has changed to DWARF v5
> with GCC 11.
> 
> .debug_sup was mentioned in review, but without compilers producing it
> today, let's wait to add it until it becomes necessary.
> 

There isn't anything in this changelog which explains why a -stable
backport was requested?  Or is there?  Irritating linker warnings? 
More than that?