linux-kernel - Re: [PATCH v5 0/3] Kbuild: DWARF v5 support

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Date:   Sun, 17 Jan 2021 17:15:00 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Yonghong Song <yhs@...com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <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>, Jiri Olsa <jolsa@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH v5 0/3] Kbuild: DWARF v5 support

Em Fri, Jan 15, 2021 at 03:43:06PM -0800, Yonghong Song escreveu:
> 
> 
> On 1/15/21 3:34 PM, Nick Desaulniers wrote:
> > On Fri, Jan 15, 2021 at 3:24 PM Yonghong Song <yhs@...com> wrote:
> > > 
> > > 
> > > 
> > > On 1/15/21 1:53 PM, Sedat Dilek wrote:
> > > > En plus, I encountered breakage with GCC v10.2.1 and LLVM=1 and
> > > > CONFIG_DEBUG_INFO_DWARF4.
> > > > So might be good to add a "depends on !DEBUG_INFO_BTF" in this combination.
> > 
> > Can you privately send me your configs that repro? Maybe I can isolate
> > it to a set of configs?
> > 
> > > 
> > > I suggested not to add !DEBUG_INFO_BTF to CONFIG_DEBUG_INFO_DWARF4.
> > > It is not there before and adding this may suddenly break some users.
> > > 
> > > If certain combination of gcc/llvm does not work for
> > > CONFIG_DEBUG_INFO_DWARF4 with pahole, this is a bug bpf community
> > > should fix.
> > 
> > Is there a place I should report bugs?
> 
> You can send bug report to Arnaldo Carvalho de Melo <acme@...nel.org>,
> dwarves@...r.kernel.org and bpf@...r.kernel.org.

I'm coming back from vacation, will try to read the messages and see if
I can fix this.

Thanks,

- Arnaldo
 
> > 
> > > 
> > > > 
> > > > I had some other small nits commented in the single patches.
> > > > 
> > > > As requested in your previous patch-series, feel free to add my:
> > > > 
> > > > Tested-by: Sedat Dilek <sedat.dilek@...il.com>
> > 
> > Yeah, I'll keep it if v6 is just commit message changes.
> > 

-- 

- Arnaldo