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Date: Fri, 8 Sep 2017 00:53:47 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Tycho Andersen <tycho@docker.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        kernel-hardening@lists.openwall.com,
        Marco Benatto <marco.antonio.780@gmail.com>,
        Juerg Haefliger <juerg.haefliger@canonical.com>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 05/11] arm64/mm: Add support for XPFO
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> +/*
> + * Lookup the page table entry for a virtual address and return a pointer to
> + * the entry. Based on x86 tree.
> + */
> +static pte_t *lookup_address(unsigned long addr)

Seems like this should be moved to common arm64 mm code and used by
kernel_page_present.