From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fengguang Wu <wfg@mail.ustc.edu.cn>
Subject: Re: [patch 01/19] Define functions for page cache handling
Date: Thu, 29 Nov 2007 16:44:18 +0800
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Cc: akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>,
	Mel Gorman <mel@skynet.ie>,
	William Lee Irwin III <wli@holomorphy.com>,
	David Chinner <dgc@sgi.com>,
	Jens Axboe <jens.axboe@oracle.com>,
	Badari Pulavarty <pbadari@gmail.com>,
	Maxim Levitsky <maximlevitsky@gmail.com>,
	Fengguang Wu <fengguang.wu@gmail.com>,
	swin wang <wangswin@gmail.com>, totty.lu@gmail.com,
	hugh@veritas.com, joern@lazybastard.org
To: Christoph Lameter <clameter@sgi.com>
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On Wed, Nov 28, 2007 at 05:10:53PM -0800, Christoph Lameter wrote:
> +static inline loff_t page_cache_mask(struct address_space *a)
> +{
> +	return (loff_t)PAGE_MASK;
> +}

A tiny question: Why choose loff_t instead of 'unsigned long'?

It's not obvious because page_cache_mask() is not referenced in this
patchset at all ;-)