linux-kernel - Re: [PATCH] bpf: Fix undeclared function 'barrier

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Date:   Wed, 22 Feb 2023 16:03:48 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: Fix undeclared function 'barrier_nospec' warning

On Wed, Feb 22, 2023 at 9:26 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> Add the missing header for architectures that don't define
> the barrier_nospec() macro. The nospec.h header is added after the
> inclusion of barrier.h to avoid redefining the macro for architectures
> that already define barrier_nospec() in their respective barrier.h
> headers.
>
> Fixes: 74e19ef0ff80 ("uaccess: Add speculation barrier to copy_from_user()")
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> Linus's master branch fails currently to build for arm64 without this commit.

Not just arm64 :-(
http://kisskb.ellerman.id.au/kisskb/head/5b7c4cabbb65f5c469464da6c5f614cbd7f730f2

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds