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Date: Wed, 20 Jan 2016 01:45:36 +0300
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: David Rientjes <rientjes@google.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>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Michal Hocko <mhocko@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>,
        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>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        Rik van Riel <riel@redhat.com>,
        "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)
Message-ID: <20160119224536.GA2262@uranus>
References: <8737tue3mn.fsf@yhuang-dev.intel.com>
 <20160119080211.GD2890@uranus>
 <alpine.DEB.2.10.1601191430110.7346@chino.kir.corp.google.com>
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On Tue, Jan 19, 2016 at 02:30:45PM -0800, David Rientjes wrote:
> 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>

Thank you. I've compile tested it, but didn't run.