linux-kernel - Re: [PATCH 1/2] [v3] bpf: hide unused bpf_patch_call

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Date:   Tue, 6 Jun 2023 15:46:49 -0700
From:   Yonghong Song <yhs@...a.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        John Fastabend <john.fastabend@...il.com>,
        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>,
        "Jason A. Donenfeld" <Jason@...c4.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] [v3] bpf: hide unused bpf_patch_call_args



On 6/2/23 6:50 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> This function is only used when CONFIG_BPF_JIT_ALWAYS_ON is disabled,
> but CONFIG_BPF_SYSCALL is enabled. When both are turned off, the
> prototype is missing but the unused function is still compiled,
> as seen from this W=1 warning:
> 
> kernel/bpf/core.c:2075:6: error: no previous prototype for 'bpf_patch_call_args' [-Werror=missing-prototypes]
> 
> Add a matching #ifdef for the definition to leave it out.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Yonghong Song <yhs@...com>