linux-kernel - Re: [PATCH v2] scripts/link-vmlinux.sh: Add alias to duplicate symbols for kallsyms

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Date:   Tue, 18 Jul 2023 10:01:15 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Alessandro Carminati <alessandro.carminati@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Viktor Malik <vmalik@...hat.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Nick Alcock <nick.alcock@...cle.com>, eugene.loh@...cle.com,
        kris.van.hees@...cle.com, live-patching@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2] scripts/link-vmlinux.sh: Add alias to duplicate
 symbols for kallsyms

On Mon, 17 Jul 2023 09:50:25 -0700
Luis Chamberlain <mcgrof@...nel.org> wrote:

> On Mon, Jul 17, 2023 at 10:52:40AM -0400, Steven Rostedt wrote:
> > Honestly, I think the "_alias_<some-random-number>" is useless. It doesn't
> > give you any clue to what function you are actually attaching to. 
> 
> Agreed.

+1 :)

> > There's
> > been other approaches that show module and/or file names. I know there's
> > still some issues with getting those accepted, but I much rather have them
> > than this!
> > 
> > See: https://lore.kernel.org/all/20221205163157.269335-1-nick.alcock@oracle.com/
> 
> Yes, please coordinate with Nick and review each other's work, now we
> have two separate efforts with different reasons but hopefully we'll
> come back with one unified solution.
> 
> Please Cc live-patching also, as they had suggested before just to
> provide the file filename + line number, that'll make it even more
> valuable.

I want to involve BTF, that is currently only support looking up function
by name. This alias is currently decouple from the BTF, but BTF name is
also need to be updated so that we can lookup BTF from the alias name.

Thank you,


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>