linux-kernel - Re: [PATCH] i40evf: remove redundant array comparisons to 0 checks

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Date:   Fri, 16 Feb 2018 18:51:57 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev <netdev@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i40evf: remove redundant array comparisons to 0 checks

On Thu, Feb 15, 2018 at 9:42 PM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> The checks to see if key->dst.s6_addr and key->src.s6_addr are null
> pointers are redundant because these are constant size arrays and
> so the checks always return true.  Fix this by removing the redundant
> checks.

> +               for (i = 0; i < 4; i++)

> +                       filter->f.mask.tcp_spec.dst_ip[i] |=
>                                                         cpu_to_be32(0xffffffff);

Can it be one line then?

> +               memcpy(&filter->f.data.tcp_spec.dst_ip,
> +                      &key->dst.s6_addr32,

Ditto.

> +                      sizeof(filter->f.data.tcp_spec.dst_ip));
> +
> +               for (i = 0; i < 4; i++)

> +                       filter->f.mask.tcp_spec.src_ip[i] |=
>                                                         cpu_to_be32(0xffffffff);

Ditto.

> +               memcpy(&filter->f.data.tcp_spec.src_ip,
> +                      &key->src.s6_addr32,

Ditto.

> +                      sizeof(filter->f.data.tcp_spec.src_ip));

-- 
With Best Regards,
Andy Shevchenko