linux-kernel - Re: [PATCH bpf-next v3 3/6] bpf: Add a bpf

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Message-ID: <CABRcYmLe-PO5nKKXjiyBhzAtx2A80qBRfy362dFzt9PA5Ndi9Q@mail.gmail.com>
Date:   Wed, 14 Apr 2021 15:32:23 +0200
From:   Florent Revest <revest@...omium.org>
To:     kernel test robot <lkp@...el.com>
Cc:     bpf <bpf@...r.kernel.org>, kbuild-all@...ts.01.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, KP Singh <kpsingh@...nel.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 3/6] bpf: Add a bpf_snprintf helper

On Mon, Apr 12, 2021 at 10:32 PM kernel test robot <lkp@...el.com> wrote:
>    m68k-linux-ld: kernel/bpf/verifier.o: in function `check_helper_call.isra.0':
> >> verifier.c:(.text+0xf79e): undefined reference to `bpf_printf_prepare'
>    m68k-linux-ld: kernel/bpf/helpers.o: in function `bpf_base_func_proto':
> >> helpers.c:(.text+0xd82): undefined reference to `bpf_snprintf_proto'

I'll move the implementation of bpf_printf_prepare/bpf_printf_cleanup
and bpf_snprintf to kernel/bpf/helpers.c so that they all get built on
kernels with CONFIG_BPF_SYSCALL but not CONFIG_BPF_EVENTS.