linux-kernel - Re: [PATCH][bpf-next] bpf: verifier: avoid fall-through warnings

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Date:   Fri, 12 Jul 2019 15:41:27 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Lawrence Brakmo <brakmo@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH][bpf-next] bpf: verifier: avoid fall-through warnings

On 07/11/2019 06:22 PM, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, this patch silences
> the following warning:
> 
> kernel/bpf/verifier.c: In function ‘check_return_code’:
> kernel/bpf/verifier.c:6106:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (env->prog->expected_attach_type == BPF_CGROUP_UDP4_RECVMSG ||
>       ^
> kernel/bpf/verifier.c:6109:2: note: here
>   case BPF_PROG_TYPE_CGROUP_SKB:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Notice that is much clearer to explicitly add breaks in each case
> statement (that actually contains some code), rather than letting
> the code to fall through.
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Acked-by: Andrii Nakryiko <andriin@...com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Looks good, applied to bpf, thanks.