netdev - Re: [PATCH -next] bpf: remove set but not used variable 'dst

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Message-ID: <C75FACD4-8549-4AD1-BDE6-1F5B47095E4C@fb.com>
Date:   Tue, 14 Apr 2020 22:05:12 +0000
From:   Song Liu <songliubraving@...com>
To:     Mao Wenan <maowenan@...wei.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "kpsingh@...omium.org" <kpsingh@...omium.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH -next] bpf: remove set but not used variable 'dst_known'



> On Apr 13, 2020, at 4:37 AM, Mao Wenan <maowenan@...wei.com> wrote:
> 
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> kernel/bpf/verifier.c:5603:18: warning: variable ‘dst_known’
> set but not used [-Wunused-but-set-variable]
> 
> It is not used since commit f1174f77b50c ("bpf/verifier:
> rework value tracking")

The fix makes sense. But I think f1174f77b50c introduced dst_known, 
so this statement is not accurate. 

> 
> Signed-off-by: Mao Wenan <maowenan@...wei.com>