linux-kernel - Re: [PATCH] kbuild: Remove debug info from kallsyms linking

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Date:   Tue, 10 Mar 2020 15:52:48 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Remove debug info from kallsyms linking

Em Tue, Mar 03, 2020 at 08:29:39PM -0800, Andrii Nakryiko escreveu:
> On Tue, Mar 3, 2020 at 6:11 PM Kees Cook <keescook@...omium.org> wrote:
> > On Tue, Mar 03, 2020 at 01:50:52PM -0800, Andrii Nakryiko wrote:
> > > On Tue, Mar 3, 2020 at 1:06 PM Kees Cook <keescook@...omium.org> wrote:
> > > > On Mon, Mar 02, 2020 at 10:55:04PM -0800, Andrii Nakryiko wrote:
> > > > > On Mon, Feb 24, 2020 at 9:17 PM Kees Cook <keescook@...omium.org> wrote:
> > > > > >         LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}
> > > > > >
> > > > > >         # dump .BTF section into raw binary file to link with final vmlinux

> > > > BTW, in looking at BTF generation, why is this cut up into three steps:
> > > > pahole, objcopy, objcopy... shouldn't pahole just gross an output method
> > > > to dump the final .o file? That would be MUCH nicer. Especially since
> > > > the first step ends up rewriting (?!) the original ELF. This is a lot of
> > > > needless IO...

> > > Just mostly historical reasons, that was the interface pahole already
> > > supported. I agree that it's a good idea to teach pahole to just emit
> > > a binary BTF section dump.

> > /me adds it to giant TODO list ;)

Mine is giant as well, but adding it anyway...

:-)

- Arnaldo