linux-kernel - Re: [PATCH v4 0/3] kbuild: Avoid weak external linkage where possible

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Message-ID: <CAMj1kXGVRGcJGS1xuqHPeJfM797RB2UiJQfSHK+oj1JQG4YECg@mail.gmail.com>
Date: Fri, 19 Apr 2024 09:57:05 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: patchwork-bot+netdevbpf@...nel.org
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org, masahiroy@...nel.org, 
	arnd@...db.de, martin.lau@...ux.dev, linux-arch@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, bpf@...r.kernel.org, andrii@...nel.org, 
	olsajiri@...il.com
Subject: Re: [PATCH v4 0/3] kbuild: Avoid weak external linkage where possible

On Tue, 16 Apr 2024 at 16:40, <patchwork-bot+netdevbpf@...nel.org> wrote:
>
> Hello:
>
> This series was applied to bpf/bpf-next.git (master)
> by Daniel Borkmann <daniel@...earbox.net>:
>
> On Mon, 15 Apr 2024 18:20:42 +0200 you wrote:
> > From: Ard Biesheuvel <ardb@...nel.org>
> >
> > Weak external linkage is intended for cases where a symbol reference
> > can remain unsatisfied in the final link. Taking the address of such a
> > symbol should yield NULL if the reference was not satisfied.
> >
> > Given that ordinary RIP or PC relative references cannot produce NULL,
> > some kind of indirection is always needed in such cases, and in position
> > independent code, this results in a GOT entry. In ordinary code, it is
> > arch specific but amounts to the same thing.
> >
> > [...]
>
> Here is the summary with links:
>   - [v4,1/3] kallsyms: Avoid weak references for kallsyms symbols
>     (no matching commit)
>   - [v4,2/3] vmlinux: Avoid weak reference to notes section
>     (no matching commit)
>   - [v4,3/3] btf: Avoid weak external references
>     https://git.kernel.org/bpf/bpf-next/c/fc5eb4a84e4c
>


Thanks.

Masahiro, could you pick up patches #1 and #2 please?