Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 7 Sep 2017 11:10:15 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Tycho Andersen <tycho@...ker.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kernel-hardening@...ts.openwall.com,
	Marco Benatto <marco.antonio.780@...il.com>,
	Juerg Haefliger <juerg.haefliger@...onical.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v6 04/11] swiotlb: Map the buffer if it was unmapped by
 XPFO

> -	if (PageHighMem(pfn_to_page(pfn))) {
> +	if (PageHighMem(page) || xpfo_page_is_unmapped(page)) {

Please don't sprinkle xpfo details over various bits of code.

Just add a helper with a descriptive name, e.g.

page_is_unmapped()

that also includes the highmem case, as that will easily document
what this check is doing.

Powered by blists - more mailing lists

Your e-mail address:

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.