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

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Date: Tue, 16 Apr 2024 14:40:27 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, ardb@...nel.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

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

You are awesome, thank you!
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