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[156.34.48.30]) by smtp.gmail.com with ESMTPSA id v136sm1031904qkb.31.2020.08.28.08.20.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Aug 2020 08:20:07 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kBgAg-000vxD-HJ; Fri, 28 Aug 2020 12:20:06 -0300 Date: Fri, 28 Aug 2020 12:20:06 -0300 From: Jason Gunthorpe To: Gerald Schaefer Cc: Linus Torvalds , Andrew Morton , linux-mm , LKML , Vasily Gorbik , Alexander Gordeev , linux-s390@vger.kernel.org, Heiko Carstens , Claudio Imbrenda , Christian Borntraeger Subject: Re: [RFC PATCH 0/2] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200828152006.GY24045@ziepe.ca> References: <20200828140314.8556-1-gerald.schaefer@linux.ibm.com> <20200828142137.GX24045@ziepe.ca> <20200828170103.6d954d95@thinkpad> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200828170103.6d954d95@thinkpad> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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