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Date: Tue, 19 Jan 2016 14:30:45 -0800 (PST)
From: David Rientjes <rientjes@google.com>
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To: Cyrill Gorcunov <gorcunov@gmail.com>
cc: kernel test robot <ying.huang@linux.intel.com>,
        Ebru Akagunduz <ebru.akagunduz@gmail.com>, lkp@01.org,
        LKML <linux-kernel@vger.kernel.org>,
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        Hugh Dickins <hughd@google.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>,
        Xie XiuQi <xiexiuqi@huawei.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
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        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [lkp] [mm] 7d2eba0557: BUG: unable to handle kernel NULL pointer
 dereference at           (null)
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On Tue, 19 Jan 2016, Cyrill Gorcunov wrote:

> Seems it should be something like that (untested at moment, please
> take a look).
> ---
> From: Cyrill Gorcunov <gorcunov@openvz.org>
> Subject: [PATCH] mm: Fix tracepoint for scanning pages
> 
> The page might be NULL so use page_to_pfn in conditional call.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

I think this is obviously correct, so

Acked-by: David Rientjes <rientjes@google.com>

But we'd benefit from a Tested-by from the robot even more.