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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [RFC PATCH] powerpc/mm: Return NULL for not present hugetlb page
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Date: Thu, 07 May 2015 16:26:53 +0530
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Cc: paulus@samba.org, linuxppc-dev@lists.ozlabs.org,
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Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:

> On Thu, 2015-05-07 at 12:46 +0530, Aneesh Kumar K.V wrote:
>> We need to check whether pte is present in follow_huge_addr and
>> properly return NULL if mapping is not present. Also use READ_ONCE
>> when dereferencing pte_t address.
>
> Do that need to go to stable as well ?

Yes. I will like David to take a look at this and give his feedback.
W.r.t patch itself I hit a build failure on mpc85xx_smp_defconfig. I will
resent after the test build finish on all configs

-aneesh