linux-kernel - Re: [RFC PATCH 0/2] mm/gup: fix gup_fast with dynamic page table folding

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Date:   Fri, 28 Aug 2020 12:20:06 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [RFC PATCH 0/2] mm/gup: fix gup_fast with dynamic page table
 folding

On Fri, Aug 28, 2020 at 05:01:03PM +0200, Gerald Schaefer wrote:

> Just to make sure, you are referring to some future / planned
> changes to mm/pagewalk.c, and not some currently existing
> pagetable walkers already using the READ_ONCE logic w/o
> spinlocks? 

Yes no current code, just something I've been looking at slowly.

Jason