linux-kernel - Re: [PATCH] net: clean up some sparse endianness warnings in ipv6.h

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Message-ID: <20140715170107.GA1722@infradead.org>
Date:	Tue, 15 Jul 2014 10:01:07 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeff Layton <jlayton@...marydata.com>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH] net: clean up some sparse endianness warnings in ipv6.h

>  #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
> -	const unsigned long *ul = (const unsigned long *)a;
> +	const __be64 *be = (const __be64 *)a;
>  
> -	return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
> +	return (be[0] | (be[1] ^ cpu_to_be64(1))) == cpu_to_be64(0UL);

Do you need the swap for 0UL?  I know sparse treats 0 as special, so why
wouldn't it treat 0UL special?  Or just remove the 0UL postfix, no need
for it in a simple comparism.

Otherwise looks fine to me.
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