Received: by 2002:a05:6a10:9848:0:0:0:0 with SMTP id x8csp117832pxf; Wed, 17 Mar 2021 00:25:08 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxa5+T8r9SGvujS4wZh+se6C4DW8stH+zndcqv+FUdaynG8j0XlFHF2Ph5LEqF7SW6+g8y1 X-Received: by 2002:a17:906:3e89:: with SMTP id a9mr17004378ejj.405.1615965908193; Wed, 17 Mar 2021 00:25:08 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1615965908; cv=none; d=google.com; s=arc-20160816; b=p9wPcwdVwuQBvGRdr+G5MYIB2IIzMPRcvV6EYxwsMCCRcJt4U1g0CLr31yxvseogeA 3L6XvRxUU6/Sda2bxdAXTcRVOMTuKhzUM7/TSg3SlsOtTgSY9Snafx67SwSLGIL7LwXb +gRifU1Nd1ST+Pe03Qaxep0sIeW0lGWo7Mv/UTVitrbqG2WjzBVbGO5IEtLSYFniAb3H DrtLZEsBUoN/gqfQI5zrByP+4YgeK+wB2v9VM50n8/9Um/EjNcklqNyCZ5q7kpljm2BX 9aLhpAZzHFi3MBa5FQ/A7zBQ4fY7tbYJKqCrzhVpc1fR1/PCax5LY9lI/Bjv/EyQhLbw e7NQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=VgWremH0I10zTIm6kNKr7I2+jlh/Pgq8sbo0UnUFG0E=; b=RBEPATFQmnLsq9tX3Ud4V4z2v/G51eRaNEKIJSrKv/3dbnBJRdLD0vDhc6cLgSE0Tz JCDbTTplzQcFNDV2OVyc83kQMD5lCybR5orfw7f9JDGBgjpr/Wg5vVurm7SdeR+lKU3F 8fYcCvRkrZsuuvQYEPjKQaGR0VOPwaDq3UONqy9yJ480953gf24Wsd/r0LuFKQYgk3fq lJby2+H16MYAsIbsvYaxa3kwp+R1pYZfEKJpQTPylj8inKZ00KdrJsr6kaS0+QP+Fgoo QEgP3FTMyvmS9d4714SWb5ANUeXiqPwtrfYLJl1brWE2FwnvM90vvZHFewx+LuziK0SN Yh8Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b="EfM8/Q3q"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id e2si15336710ejd.17.2021.03.17.00.24.45; Wed, 17 Mar 2021 00:25:08 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b="EfM8/Q3q"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230037AbhCQHXf (ORCPT + 99 others); Wed, 17 Mar 2021 03:23:35 -0400 Received: from casper.infradead.org ([90.155.50.34]:47140 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229469AbhCQHW7 (ORCPT ); Wed, 17 Mar 2021 03:22:59 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=VgWremH0I10zTIm6kNKr7I2+jlh/Pgq8sbo0UnUFG0E=; b=EfM8/Q3qa7owXrxD2xbByTMBCc UUhCwPxAvE3Qk7tC5abxDLcA9s5y2ZKUPGF5hWctwYKb4Nn2nX04O4+uaY+ZLbGh4YfR/oJTx/q4B /7i++JYLd03hMb5X7tbEoXnY/CeLk88Q1DAzIiCQ4wyiMEx0gFta3wGDp9wO/I01tnKk0eCkP5ds2 1TRRkJ5dwk6DTrqIfCQlcBYjRdqkEZn+U1ADNC7qlhKZZUDT+ee5BIW6rr89U0o8640JvoEHVxuh1 /P7Sg724uFmxdbapDmMOr71b0Nh9XTVcei7a4V/hvQsdGJGzYw8OCfw2U3qWhTJ6y+8d31Yo41GV5 SmA58zaA==; Received: from hch by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lMQW0-001Ckh-8P; Wed, 17 Mar 2021 07:22:49 +0000 Date: Wed, 17 Mar 2021 07:22:48 +0000 From: Christoph Hellwig To: Daniel Vetter Cc: Christoph Hellwig , DRI Development , LKML , KVM list , Linux MM , Linux ARM , linux-samsung-soc , "open list:DMA BUFFER SHARING FRAMEWORK" , Tomasz Figa , Hans Verkuil , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , J??r??me Glisse , Jan Kara , Pawel Osciak , Marek Szyprowski , Kyungmin Park , Laurent Dufour , Vlastimil Babka , Daniel Jordan , Michel Lespinasse Subject: Re: [PATCH 2/3] media/videobuf1|2: Mark follow_pfn usage as unsafe Message-ID: <20210317072248.GA284559@infradead.org> References: <20210316153303.3216674-1-daniel.vetter@ffwll.ch> <20210316153303.3216674-3-daniel.vetter@ffwll.ch> <20210316154549.GA60450@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 16, 2021 at 04:52:44PM +0100, Daniel Vetter wrote: > My understanding is mostly, but with some objections. And I kinda > don't want to let this die in a bikeshed and then not getting rid of > follow_pfn as a result. There's enough people who acked this, and the > full removal got some nack from Mauro iirc. Hmm, ok I must have missed that. I defintively prefer your series over doing nothing, but killing the dead horse ASAP would be even better.