netdev - Re: [PATCH] net: fix bogus cast in skb_pagelen() and use unsigned variables

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Message-ID: <CACVxJT90bUVFFZkCS1uxRLbptGFRUDYdtoXiXg8xufeucSsa=g@mail.gmail.com>
Date:   Wed, 23 Nov 2016 18:35:43 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: fix bogus cast in skb_pagelen() and use unsigned variables

On Wed, Nov 23, 2016 at 3:49 PM, David Laight <David.Laight@...lab.com> wrote:
> From: Alexey Dobriyan
>> Sent: 19 November 2016 01:08
> ...
>> -     for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--)
>> +     for (i = skb_shinfo(skb)->nr_frags - 1; (int)i >= 0; i--)
>>               len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
>
> Think I'd use:
>         for (i = skb_shinfo(skb)->nr_frags; i-- != 0; )

This kind of diverges from canonical loop form:

  for (init; temination condition: iterator)

by shifting everything into termination part.

  A