linux-kernel - Re: [RFC] mm/mremap: Remove redundant checks inside vma

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Message-Id: <0fbc7a4a-9e3f-fb64-65cd-3259335bd07e@linux.vnet.ibm.com>
Date:   Tue, 11 Jul 2017 16:49:03 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>, Vlastimil Babka <vbabka@...e.cz>
Cc:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, mike.kravetz@...cle.com
Subject: Re: [RFC] mm/mremap: Remove redundant checks inside vma_expandable()

On 07/11/2017 12:52 PM, Michal Hocko wrote:
> On Tue 11-07-17 09:16:12, Michal Hocko wrote:
>> On Tue 11-07-17 08:56:04, Vlastimil Babka wrote:
> [...]
>>> It doesn't explain why it's redundant, indeed. Unfortunately, the commit
>>> f106af4e90ea ("fix checks for expand-in-place mremap") which added this,
>>> also doesn't explain why it's needed.
>>
>> Because it doesn't do anything AFAICS.
> 
> Well, it does actually. I have missed security_mmap_addr hook.

But we any way call get_unmapped_area() down the line in the function,
it should be covered then. Does the proposed change look good and be
considered, or any changes required or can be dropped ?