linux-kernel - Re: [PATCH 0/7] tcp: bugs and cleanup for 2.6.33

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Date:	Thu, 25 Feb 2010 20:43:11 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	William Allen Simpson <william.allen.simpson@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 0/7] tcp: bugs and cleanup for 2.6.33

On Thu, 2010-02-25 at 15:34 -0500, William Allen Simpson wrote:
> Redefine two TCP header functions to accept TCP header pointer.
> When subtracting, return signed int to allow error checking.

This patch only adds functions, so why do you say 'redefine'?

> These functions will be used in subsequent patches that implement
> additional features.
[...]
> +/* Length of standard options only.  This could be negative. */
> +static inline int tcp_option_len_th(const struct tcphdr *th)
> +{
> +       return (int)(th->doff * 4) - sizeof(*th);
> +}

I don't see  the point of this cast; the left operand of the subtraction
will in any case be promoted to size_t to match the right operand.

Did you mean
	return (int)(th->doff * 4 - sizeof(*th));
?

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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