linux-kernel - Re: [PATCH] sysctl: Remove redundant assignment to first

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Message-ID: <YJUj7glesit6HnF6@casper.infradead.org>
Date:   Fri, 7 May 2021 12:26:38 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH] sysctl: Remove redundant assignment to first

On Fri, May 07, 2021 at 06:15:54PM +0800, Jiapeng Chong wrote:
> Variable first is set to '0', but this value is never read as it is
> not used later on, hence it is a redundant assignment and can be
> removed.
> 
> Clean up the following clang-analyzer warning:
> 
> kernel/sysctl.c:1562:4: warning: Value stored to 'first' is never read
> [clang-analyzer-deadcode.DeadStores].

While this is true, it is incomplete.  The 'first' declaration should be
moved into the 'else' arm of the 'if (write)' conditional.