linux-kernel - Have some confusion about the pfn

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Date:	Sat, 6 Feb 2016 16:14:07 +0800
From:	zhong jiang <zhongjiang@...wei.com>
To:	<mel@....ul.ie>
CC:	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Have some confusion about the pfn_valid() ?

Hi

In my opinion, pfn_valid() is meant to be able to tell if a given PFN has valid
section, and That section can contain corresponding mem_map. but, the section can
be has holes, the corresponding mem_map also be allcoated, resulting in treating
the PFN as valid incorrect.

what's problem for the interpretation of the above?