linux-kernel - Re: [PATCH] mm: migrate: add missing flush_dcache

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Message-ID: <237ecd2f-477f-2dc7-7849-643e47fe56d5@axis.com>
Date:   Thu, 7 Mar 2019 15:17:24 +0100
From:   Lars Persson <lars.persson@...s.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Lars Persson <larper@...s.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-mips@...r.kernel.org>
Subject: Re: [PATCH] mm: migrate: add missing flush_dcache_page for non-mapped
 page migrate



On 2/26/19 12:57 PM, Lars Persson wrote:
> 
> 
> On 2/26/19 11:07 AM, Vlastimil Babka wrote:
>> On 2/26/19 9:40 AM, Lars Persson wrote:
>>>> What about CC stable and a Fixes tag, would it be applicable here?
>>>>
>>>
>>> Yes this is candidate for stable so let's add:
>>> Cc: <stable@...r.kernel.org>
>>>
>>> I do not find a good candidate for a Fixes tag.
>>
>> How bout a version range where the bug needs to be fixed then?
>>
> 
> The distinction between mapped and non-mapped old page was introduced in 2ebba6b7e1d9 ("mm: unmapped page migration avoid unmap+remap overhead") so at least it applies to stable 4.4+.
> 
> Before that patch there was always a call to remove_migration_ptes() but I cannot conclude if those earlier versions actually will reach the flush_dcache_page call if the old page was unmapped.
> 

Should I submit a V2 patch with CC stable for v4.4+ ?

- Lars