Re: [PATCH] bpf: Fix undeclared function 'barrier_nospec' warning

[Geert Uytterhoeven]

On Wed, Feb 22, 2023 at 9:26 AM Viresh Kumar <viresh.kumar@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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