linux-kernel - Re: [PATCH v2 6/8] mm: prevent get_user_pages() from overflowing page refcount

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Date:   Mon, 11 Nov 2019 05:00:29 +0000
From:   Ajay Kaher <akaher@...are.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "punit.agrawal@....com" <punit.agrawal@....com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "mszeredi@...hat.com" <mszeredi@...hat.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Srivatsa Bhat <srivatsab@...are.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        Srinidhi Rao <srinidhir@...are.com>,
        Vikash Bansal <bvikas@...are.com>,
        Anish Swaminathan <anishs@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>,
        Steven Rostedt <srostedt@...are.com>,
        "stable@...nel.org" <stable@...nel.org>,
        Ben Hutchings <ben@...adent.org.uk>
Subject: Re: [PATCH v2 6/8] mm: prevent get_user_pages() from overflowing page
 refcount


On 06/11/19, 2:25 PM, "Vlastimil Babka" <vbabka@...e.cz> wrote:

> On 10/25/19 8:18 AM, Ajay Kaher wrote:
>> On 17/10/19, 9:58 PM, "Ajay Kaher" <akaher@...are.com> wrote:
>>     
>>>    
>>> Could we handle arch-specific gup.c in different patch sets and 
>>> let these patches to merge to 4.4.y?
>>   
>> Vlastimil, please suggest if it's fine to merge these patches to 4.4.y
>
> I'm not sure if it makes much sense to merge them without the arch-specific gup
> support, when we're aware that it's missing.
>
>> and handle arch-specific gup.c in different patch sets starts from 4.19.y,
>
> Actually arch-specific gup.c were removed in 4.13, so it's enough to start from
> 4.9.y, which I'm going to finally look into.

Yes x86 gup.c is removed. s390 gup.c is present till 4.19,
so if you are making changes in this file for 4.4.y and 4.9.y, 
then same should be done for 4.14.y and v4.19.y.

- Ajay