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

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Date:   Thu, 21 Nov 2019 21:38:23 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        "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 Mon, Nov 11, 2019 at 05:00:29AM +0000, Ajay Kaher wrote:
> 
> 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.

Ok, I have no idea what to do here.  I have two different series from
both of you, yet they are different.

Can you both come up with a series you agree on, and send it to me, with
both of your acks so that I know this is what should be applied?  I've
deleted both of your current series from my todo mbox.

thanks,

greg k-h