linux-kernel - RE: [PATCH v6 1/2] mm: migration: fix the FOLL

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Date:   Wed, 17 Aug 2022 05:47:08 +0000
From:   "Wang, Haiyue" <haiyue.wang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "david@...hat.com" <david@...hat.com>,
        "apopple@...dia.com" <apopple@...dia.com>,
        "linmiaohe@...wei.com" <linmiaohe@...wei.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "naoya.horiguchi@...ux.dev" <naoya.horiguchi@...ux.dev>,
        "alex.sierra@....com" <alex.sierra@....com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: RE: [PATCH v6 1/2] mm: migration: fix the FOLL_GET failure on
 following huge page

> -----Original Message-----
> From: Andrew Morton <akpm@...ux-foundation.org>
> Sent: Wednesday, August 17, 2022 13:43
> To: Wang, Haiyue <haiyue.wang@...el.com>
> Cc: linux-mm@...ck.org; linux-kernel@...r.kernel.org; david@...hat.com; apopple@...dia.com;
> linmiaohe@...wei.com; Huang, Ying <ying.huang@...el.com>; songmuchun@...edance.com;
> naoya.horiguchi@...ux.dev; alex.sierra@....com; Heiko Carstens <hca@...ux.ibm.com>; Vasily Gorbik
> <gor@...ux.ibm.com>; Alexander Gordeev <agordeev@...ux.ibm.com>; Christian Borntraeger
> <borntraeger@...ux.ibm.com>; Sven Schnelle <svens@...ux.ibm.com>; Mike Kravetz
> <mike.kravetz@...cle.com>
> Subject: Re: [PATCH v6 1/2] mm: migration: fix the FOLL_GET failure on following huge page
> 
> On Wed, 17 Aug 2022 03:31:37 +0000 "Wang, Haiyue" <haiyue.wang@...el.com> wrote:
> 
> > > >  		}
> > >
> > > I would be better to fix this for real at those three client code sites?
> >
> > Then 5.19 will break for a while to wait for the final BIG patch ?
> 
> If that's the proposal then your [1/2] should have had a cc:stable and
> changelog words describing the plan for 6.0.
> 
> But before we do that I'd like to see at least a prototype of the final
> fixes to s390 and hugetlb, so we can assess those as preferable for

Got it, make sense. ;-)

> backporting.  I don't think they'll be terribly intrusive or risky?