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Message-ID: <20170907181015.GA9557@infradead.org>
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.
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