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References: <20240415162041.2491523-5-ardb+git@google.com> <20240415162041.2491523-7-ardb+git@google.com>
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From: Masahiro Yamada <masahiroy@kernel.org>
Date: Sat, 20 Apr 2024 22:42:32 +0900
Message-ID: <CAK7LNASq6ieck5Gw1sLZVp9mC3g-HhZWEhHQmG+wDB__4mX8QA@mail.gmail.com>
Subject: Re: [PATCH v4 2/3] vmlinux: Avoid weak reference to notes section
To: Ard Biesheuvel <ardb+git@google.com>
Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>, 
	Arnd Bergmann <arnd@arndb.de>, Martin KaFai Lau <martin.lau@linux.dev>, linux-arch@vger.kernel.org, 
	linux-kbuild@vger.kernel.org, bpf@vger.kernel.org, 
	Andrii Nakryiko <andrii@kernel.org>, Jiri Olsa <olsajiri@gmail.com>
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On Tue, Apr 16, 2024 at 1:20=E2=80=AFAM Ard Biesheuvel <ardb+git@google.com=
> wrote:
>
> From: Ard Biesheuvel <ardb@kernel.org>
>
> Weak references are references that are permitted to remain unsatisfied
> in the final link. This means they cannot be implemented using place
> relative relocations, resulting in GOT entries when using position
> independent code generation.
>
> The notes section should always exist, so the weak annotations can be
> omitted.
>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>


Applied to linux-kbuild.
Thanks.


> ---
>  kernel/ksysfs.c | 4 ++--
>  lib/buildid.c   | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
> index 495b69a71a5d..07fb5987b42b 100644
> --- a/kernel/ksysfs.c
> +++ b/kernel/ksysfs.c
> @@ -228,8 +228,8 @@ KERNEL_ATTR_RW(rcu_normal);
>  /*
>   * Make /sys/kernel/notes give the raw contents of our kernel .notes sec=
tion.
>   */
> -extern const void __start_notes __weak;
> -extern const void __stop_notes __weak;
> +extern const void __start_notes;
> +extern const void __stop_notes;
>  #define        notes_size (&__stop_notes - &__start_notes)
>
>  static ssize_t notes_read(struct file *filp, struct kobject *kobj,
> diff --git a/lib/buildid.c b/lib/buildid.c
> index 898301b49eb6..7954dd92e36c 100644
> --- a/lib/buildid.c
> +++ b/lib/buildid.c
> @@ -182,8 +182,8 @@ unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __r=
o_after_init;
>   */
>  void __init init_vmlinux_build_id(void)
>  {
> -       extern const void __start_notes __weak;
> -       extern const void __stop_notes __weak;
> +       extern const void __start_notes;
> +       extern const void __stop_notes;
>         unsigned int size =3D &__stop_notes - &__start_notes;
>
>         build_id_parse_buf(&__start_notes, vmlinux_build_id, size);
> --
> 2.44.0.683.g7961c838ac-goog
>
>


--=20
Best Regards
Masahiro Yamada