linux-kernel - Re: [PATCH 10/15] mm/hmm: do not differentiate between empty entry or missing directory v2

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Date:   Wed, 21 Mar 2018 16:16:50 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Jerome Glisse <jglisse@...hat.com>
CC:     <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>
Subject: Re: [PATCH 10/15] mm/hmm: do not differentiate between empty entry or
 missing directory v2

On 03/21/2018 07:48 AM, Jerome Glisse wrote:
> On Tue, Mar 20, 2018 at 10:24:34PM -0700, John Hubbard wrote:
>> On 03/19/2018 07:00 PM, jglisse@...hat.com wrote:
>>> From: Jérôme Glisse <jglisse@...hat.com>
>>>

<snip>

>>
>> <snip>
>>
>>> @@ -438,7 +423,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
>>>  		pfns[i] = 0;
>>>  
>>>  		if (pte_none(pte)) {
>>> -			pfns[i] = HMM_PFN_EMPTY;
>>> +			pfns[i] = 0;
>>
>> This works, but why not keep HMM_PFN_EMPTY, and just define it as zero?
>> Symbols are better than raw numbers here.
>>
> 
> The last patch do that so i don't think it is worth respinning
> just to make this intermediate state prettier.
> 

Yes, you're right, of course. And, no other problems found, so:

Reviewed-by: John Hubbard <jhubbard@...dia.com>

thanks,
-- 
John Hubbard
NVIDIA