linux-kernel - Re: kernel/bpf/core.c:1913:3: error: call to undeclared function 'barrier_nospec'; ISO C99 and later do not support implicit function declarations

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Date:   Wed, 22 Feb 2023 13:59:58 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: kernel/bpf/core.c:1913:3: error: call to undeclared function
 'barrier_nospec'; ISO C99 and later do not support implicit function declarations

On Wed, Feb 22, 2023 at 11:12 AM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   5b7c4cabbb65f5c469464da6c5f614cbd7f730f2
> commit: 74e19ef0ff8061ef55957c3abd71614ef0f42f47 uaccess: Add speculation barrier to copy_from_user()
> date:   6 hours ago
> config: hexagon-buildonly-randconfig-r005-20230222 (https://download.01.org/0day-ci/archive/20230222/202302221228.E0rmVamR-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)

> >> kernel/bpf/core.c:1913:3: error: call to undeclared function 'barrier_nospec'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>                    barrier_nospec();
>                    ^

I got the same one for arm64, the following patch must fix this.

https://lore.kernel.org/all/9c476aa64c9588205817833dbaa622f87c0e0081.1677051600.git.viresh.kumar@linaro.org/