linux-kernel - Re: [PATCH] kernfs: Fix kernfs_name

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Message-ID: <20141204165320.GA2995@htj.dyndns.org>
Date:	Thu, 4 Dec 2014 11:53:20 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernfs: Fix kernfs_name_compare

Hello,

On Thu, Dec 04, 2014 at 05:19:34PM +0100, Rasmus Villemoes wrote:
...
>  {
> +	/*
> +	 * This is ok because the hash values are restricted to [0,
> +	 * 2^31-1] and because we are returning int (it would be wrong
> +	 * had the return type been wider!).
> +	 */
>  	if (hash != kn->hash)
>  		return hash - kn->hash;

Let's just do < > comparisons here too and just note that trying to
determine ordering through subtraction is dangerous.

Thanks.

-- 
tejun
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