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Date: Sat, 9 Sep 2017 08:35:17 -0700
From: Laura Abbott <labbott@...hat.com>
To: Tycho Andersen <tycho@...ker.com>, linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, kernel-hardening@...ts.openwall.com,
Marco Benatto <marco.antonio.780@...il.com>,
Juerg Haefliger <juerg.haefliger@...onical.com>, x86@...nel.org
Subject: Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame
Ownership (XPFO)
On 09/07/2017 10:36 AM, Tycho Andersen wrote:
> +static inline struct xpfo *lookup_xpfo(struct page *page)
> +{
> + struct page_ext *page_ext = lookup_page_ext(page);
> +
> + if (unlikely(!page_ext)) {
> + WARN(1, "xpfo: failed to get page ext");
> + return NULL;
> + }
> +
> + return (void *)page_ext + page_xpfo_ops.offset;
> +}
> +
Just drop the WARN. On my arm64 UEFI machine this spews warnings
under most normal operation. This should be normal for some
situations but I haven't had the time to dig into why this
is so pronounced on arm64.
Thanks,
Laura
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