From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0457CC433FF for ; Fri, 2 Aug 2019 12:41:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB1762087E for ; Fri, 2 Aug 2019 12:41:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387804AbfHBMlv (ORCPT ); Fri, 2 Aug 2019 08:41:51 -0400 Received: from mx2.suse.de ([195.135.220.15]:35710 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728404AbfHBMlv (ORCPT ); Fri, 2 Aug 2019 08:41:51 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 20E6FAF94; Fri, 2 Aug 2019 12:41:48 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id F40A51E3F4D; Fri, 2 Aug 2019 14:41:46 +0200 (CEST) Date: Fri, 2 Aug 2019 14:41:46 +0200 From: Jan Kara To: Michal Hocko Cc: john.hubbard@gmail.com, Andrew Morton , Christoph Hellwig , Dan Williams , Dave Chinner , Dave Hansen , Ira Weiny , Jan Kara , Jason Gunthorpe , =?iso-8859-1?B?Suly9G1l?= Glisse , LKML , amd-gfx@lists.freedesktop.org, ceph-devel@vger.kernel.org, devel@driverdev.osuosl.org, devel@lists.orangefs.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-crypto@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-xfs@vger.kernel.org, netdev@vger.kernel.org, rds-devel@oss.oracle.com, sparclinux@vger.kernel.org, x86@kernel.org, xen-devel@lists.xenproject.org, John Hubbard Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites Message-ID: <20190802124146.GL25064@quack2.suse.cz> References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On Fri 02-08-19 11:12:44, Michal Hocko wrote: > On Thu 01-08-19 19:19:31, john.hubbard@gmail.com wrote: > [...] > > 2) Convert all of the call sites for get_user_pages*(), to > > invoke put_user_page*(), instead of put_page(). This involves dozens of > > call sites, and will take some time. > > How do we make sure this is the case and it will remain the case in the > future? There must be some automagic to enforce/check that. It is simply > not manageable to do it every now and then because then 3) will simply > be never safe. > > Have you considered coccinele or some other scripted way to do the > transition? I have no idea how to deal with future changes that would > break the balance though. Yeah, that's why I've been suggesting at LSF/MM that we may need to create a gup wrapper - say vaddr_pin_pages() - and track which sites dropping references got converted by using this wrapper instead of gup. The counterpart would then be more logically named as unpin_page() or whatever instead of put_user_page(). Sure this is not completely foolproof (you can create new callsite using vaddr_pin_pages() and then just drop refs using put_page()) but I suppose it would be a high enough barrier for missed conversions... Thoughts? Honza -- Jan Kara SUSE Labs, CR From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Date: Fri, 02 Aug 2019 12:41:46 +0000 Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites Message-Id: <20190802124146.GL25064@quack2.suse.cz> List-Id: References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michal Hocko Cc: linux-fbdev@vger.kernel.org, Jan Kara , kvm@vger.kernel.org, Dave Hansen , Dave Chinner , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Ira Weiny , Dan Williams , devel@driverdev.osuosl.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, x86@kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-media@vger.kernel.org, John Hubbard , intel-gfx@lists.freedesktop.org, john.hubbard@gmail.com, linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , linux-rpi-kernel@lists.infradead.org, ceph-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.orglinux- On Fri 02-08-19 11:12:44, Michal Hocko wrote: > On Thu 01-08-19 19:19:31, john.hubbard@gmail.com wrote: > [...] > > 2) Convert all of the call sites for get_user_pages*(), to > > invoke put_user_page*(), instead of put_page(). This involves dozens of > > call sites, and will take some time. > > How do we make sure this is the case and it will remain the case in the > future? There must be some automagic to enforce/check that. It is simply > not manageable to do it every now and then because then 3) will simply > be never safe. > > Have you considered coccinele or some other scripted way to do the > transition? I have no idea how to deal with future changes that would > break the balance though. Yeah, that's why I've been suggesting at LSF/MM that we may need to create a gup wrapper - say vaddr_pin_pages() - and track which sites dropping references got converted by using this wrapper instead of gup. The counterpart would then be more logically named as unpin_page() or whatever instead of put_user_page(). Sure this is not completely foolproof (you can create new callsite using vaddr_pin_pages() and then just drop refs using put_page()) but I suppose it would be a high enough barrier for missed conversions... Thoughts? Honza -- Jan Kara SUSE Labs, CR From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites Date: Fri, 2 Aug 2019 14:41:46 +0200 Message-ID: <20190802124146.GL25064@quack2.suse.cz> References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Michal Hocko Cc: linux-fbdev@vger.kernel.org, Jan Kara , kvm@vger.kernel.org, Dave Hansen , Dave Chinner , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Ira Weiny , Dan Williams , devel@driverdev.osuosl.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, x86@kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-media@vger.kernel.org, John Hubbard , intel-gfx@lists.freedesktop.org, john.hubbard@gmail.com, linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , linux-rpi-kernel@lists.infradead.org, ceph-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.orglinux- List-Id: ceph-devel.vger.kernel.org T24gRnJpIDAyLTA4LTE5IDExOjEyOjQ0LCBNaWNoYWwgSG9ja28gd3JvdGU6Cj4gT24gVGh1IDAx LTA4LTE5IDE5OjE5OjMxLCBqb2huLmh1YmJhcmRAZ21haWwuY29tIHdyb3RlOgo+IFsuLi5dCj4g PiAyKSBDb252ZXJ0IGFsbCBvZiB0aGUgY2FsbCBzaXRlcyBmb3IgZ2V0X3VzZXJfcGFnZXMqKCks IHRvCj4gPiBpbnZva2UgcHV0X3VzZXJfcGFnZSooKSwgaW5zdGVhZCBvZiBwdXRfcGFnZSgpLiBU aGlzIGludm9sdmVzIGRvemVucyBvZgo+ID4gY2FsbCBzaXRlcywgYW5kIHdpbGwgdGFrZSBzb21l IHRpbWUuCj4gCj4gSG93IGRvIHdlIG1ha2Ugc3VyZSB0aGlzIGlzIHRoZSBjYXNlIGFuZCBpdCB3 aWxsIHJlbWFpbiB0aGUgY2FzZSBpbiB0aGUKPiBmdXR1cmU/IFRoZXJlIG11c3QgYmUgc29tZSBh dXRvbWFnaWMgdG8gZW5mb3JjZS9jaGVjayB0aGF0LiBJdCBpcyBzaW1wbHkKPiBub3QgbWFuYWdl YWJsZSB0byBkbyBpdCBldmVyeSBub3cgYW5kIHRoZW4gYmVjYXVzZSB0aGVuIDMpIHdpbGwgc2lt cGx5Cj4gYmUgbmV2ZXIgc2FmZS4KPiAKPiBIYXZlIHlvdSBjb25zaWRlcmVkIGNvY2NpbmVsZSBv ciBzb21lIG90aGVyIHNjcmlwdGVkIHdheSB0byBkbyB0aGUKPiB0cmFuc2l0aW9uPyBJIGhhdmUg bm8gaWRlYSBob3cgdG8gZGVhbCB3aXRoIGZ1dHVyZSBjaGFuZ2VzIHRoYXQgd291bGQKPiBicmVh ayB0aGUgYmFsYW5jZSB0aG91Z2guCgpZZWFoLCB0aGF0J3Mgd2h5IEkndmUgYmVlbiBzdWdnZXN0 aW5nIGF0IExTRi9NTSB0aGF0IHdlIG1heSBuZWVkIHRvIGNyZWF0ZQphIGd1cCB3cmFwcGVyIC0g c2F5IHZhZGRyX3Bpbl9wYWdlcygpIC0gYW5kIHRyYWNrIHdoaWNoIHNpdGVzIGRyb3BwaW5nCnJl ZmVyZW5jZXMgZ290IGNvbnZlcnRlZCBieSB1c2luZyB0aGlzIHdyYXBwZXIgaW5zdGVhZCBvZiBn dXAuIFRoZQpjb3VudGVycGFydCB3b3VsZCB0aGVuIGJlIG1vcmUgbG9naWNhbGx5IG5hbWVkIGFz IHVucGluX3BhZ2UoKSBvciB3aGF0ZXZlcgppbnN0ZWFkIG9mIHB1dF91c2VyX3BhZ2UoKS4gIFN1 cmUgdGhpcyBpcyBub3QgY29tcGxldGVseSBmb29scHJvb2YgKHlvdSBjYW4KY3JlYXRlIG5ldyBj YWxsc2l0ZSB1c2luZyB2YWRkcl9waW5fcGFnZXMoKSBhbmQgdGhlbiBqdXN0IGRyb3AgcmVmcyB1 c2luZwpwdXRfcGFnZSgpKSBidXQgSSBzdXBwb3NlIGl0IHdvdWxkIGJlIGEgaGlnaCBlbm91Z2gg YmFycmllciBmb3IgbWlzc2VkCmNvbnZlcnNpb25zLi4uIFRob3VnaHRzPwoKCQkJCQkJCQlIb256 YQoKLS0gCkphbiBLYXJhIDxqYWNrQHN1c2UuY29tPgpTVVNFIExhYnMsIENSCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5nIGxp c3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNr dG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbA== From mboxrd@z Thu Jan 1 00:00:00 1970 From: jack@suse.cz (Jan Kara) Date: Fri, 2 Aug 2019 14:41:46 +0200 Subject: [PATCH 00/34] put_user_pages(): miscellaneous call sites In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> Message-ID: <20190802124146.GL25064@quack2.suse.cz> List-Id: Linux Driver Project Developer List On Fri 02-08-19 11:12:44, Michal Hocko wrote: > On Thu 01-08-19 19:19:31, john.hubbard@gmail.com wrote: > [...] > > 2) Convert all of the call sites for get_user_pages*(), to > > invoke put_user_page*(), instead of put_page(). This involves dozens of > > call sites, and will take some time. > > How do we make sure this is the case and it will remain the case in the > future? There must be some automagic to enforce/check that. It is simply > not manageable to do it every now and then because then 3) will simply > be never safe. > > Have you considered coccinele or some other scripted way to do the > transition? I have no idea how to deal with future changes that would > break the balance though. Yeah, that's why I've been suggesting at LSF/MM that we may need to create a gup wrapper - say vaddr_pin_pages() - and track which sites dropping references got converted by using this wrapper instead of gup. The counterpart would then be more logically named as unpin_page() or whatever instead of put_user_page(). Sure this is not completely foolproof (you can create new callsite using vaddr_pin_pages() and then just drop refs using put_page()) but I suppose it would be a high enough barrier for missed conversions... Thoughts? Honza -- Jan Kara SUSE Labs, CR From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B93F9C433FF for ; Fri, 2 Aug 2019 12:41:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 902D52087E for ; Fri, 2 Aug 2019 12:41:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="buxRsXvG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 902D52087E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=EBW07syHb1+s6W/gX3Ue1v66V2gsX7juyoaZMIMmGig=; b=buxRsXvG4hMx1p ATP3jNYi5rZdxhwiY3CehbKKofMF0bDhe0gScgB3qApg1fIpftwmwbrxsl8+0DpPdx+e9T6O7PH2g DUKx5oeTEQ7LCWg5aTcVdh2y+HG2fiFcyEBRh+hq9I1kom1M9RVg+EpeBP5qb/30dJNqbnWla+eJq gXd7h+KnD/ZWD6AcPD2ExXvi6Exhqqf31wJFbqKkniaROa2hvFrYVeoQSVx1cegsthedajDO9PxTo GRyas31kr5RyWbbu68B/bzDATXVR9wdjqDh/8K+rv1ElHDpLmiiq+BG/DZr7L6XV7B91hKFtR3xxM 6roENhpBTNFjf7wwlu+w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1htWsc-00056k-Qi; Fri, 02 Aug 2019 12:41:54 +0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1htWsZ-000569-QX; Fri, 02 Aug 2019 12:41:53 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 20E6FAF94; Fri, 2 Aug 2019 12:41:48 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id F40A51E3F4D; Fri, 2 Aug 2019 14:41:46 +0200 (CEST) Date: Fri, 2 Aug 2019 14:41:46 +0200 From: Jan Kara To: Michal Hocko Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites Message-ID: <20190802124146.GL25064@quack2.suse.cz> References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190802_054152_007191_E0DA3C6A X-CRM114-Status: GOOD ( 14.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, Jan Kara , kvm@vger.kernel.org, Dave Hansen , Dave Chinner , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Ira Weiny , Dan Williams , devel@driverdev.osuosl.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, x86@kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-media@vger.kernel.org, John Hubbard , intel-gfx@lists.freedesktop.org, john.hubbard@gmail.com, linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , linux-rpi-kernel@lists.infradead.org, ceph-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, LKML , linux-xfs@vger.kernel.org, linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org, Andrew Morton Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri 02-08-19 11:12:44, Michal Hocko wrote: > On Thu 01-08-19 19:19:31, john.hubbard@gmail.com wrote: > [...] > > 2) Convert all of the call sites for get_user_pages*(), to > > invoke put_user_page*(), instead of put_page(). This involves dozens of > > call sites, and will take some time. > > How do we make sure this is the case and it will remain the case in the > future? There must be some automagic to enforce/check that. It is simply > not manageable to do it every now and then because then 3) will simply > be never safe. > > Have you considered coccinele or some other scripted way to do the > transition? I have no idea how to deal with future changes that would > break the balance though. Yeah, that's why I've been suggesting at LSF/MM that we may need to create a gup wrapper - say vaddr_pin_pages() - and track which sites dropping references got converted by using this wrapper instead of gup. The counterpart would then be more logically named as unpin_page() or whatever instead of put_user_page(). Sure this is not completely foolproof (you can create new callsite using vaddr_pin_pages() and then just drop refs using put_page()) but I suppose it would be a high enough barrier for missed conversions... Thoughts? Honza -- Jan Kara SUSE Labs, CR _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85CBEC433FF for ; Fri, 2 Aug 2019 12:42:04 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6135421726 for ; Fri, 2 Aug 2019 12:42:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6135421726 Authentication-Results: mail.kernel.org; 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Fri, 2 Aug 2019 14:41:46 +0200 (CEST) Date: Fri, 2 Aug 2019 14:41:46 +0200 From: Jan Kara To: Michal Hocko Message-ID: <20190802124146.GL25064@quack2.suse.cz> References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802091244.GD6461@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190802091244.GD6461@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) Subject: Re: [Xen-devel] [PATCH 00/34] put_user_pages(): miscellaneous call sites X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, Jan Kara , kvm@vger.kernel.org, Dave Hansen , Dave Chinner , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Ira Weiny , Dan Williams , devel@driverdev.osuosl.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, x86@kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-media@vger.kernel.org, John Hubbard , intel-gfx@lists.freedesktop.org, john.hubbard@gmail.com, linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , linux-rpi-kernel@lists.infradead.org, ceph-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, LKML , linux-xfs@vger.kernel.org, linux-crypto@vger.kernel.org, linux-fsdevel@vger.kernel.org, Andrew Morton Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gRnJpIDAyLTA4LTE5IDExOjEyOjQ0LCBNaWNoYWwgSG9ja28gd3JvdGU6Cj4gT24gVGh1IDAx LTA4LTE5IDE5OjE5OjMxLCBqb2huLmh1YmJhcmRAZ21haWwuY29tIHdyb3RlOgo+IFsuLi5dCj4g PiAyKSBDb252ZXJ0IGFsbCBvZiB0aGUgY2FsbCBzaXRlcyBmb3IgZ2V0X3VzZXJfcGFnZXMqKCks IHRvCj4gPiBpbnZva2UgcHV0X3VzZXJfcGFnZSooKSwgaW5zdGVhZCBvZiBwdXRfcGFnZSgpLiBU aGlzIGludm9sdmVzIGRvemVucyBvZgo+ID4gY2FsbCBzaXRlcywgYW5kIHdpbGwgdGFrZSBzb21l IHRpbWUuCj4gCj4gSG93IGRvIHdlIG1ha2Ugc3VyZSB0aGlzIGlzIHRoZSBjYXNlIGFuZCBpdCB3 aWxsIHJlbWFpbiB0aGUgY2FzZSBpbiB0aGUKPiBmdXR1cmU/IFRoZXJlIG11c3QgYmUgc29tZSBh dXRvbWFnaWMgdG8gZW5mb3JjZS9jaGVjayB0aGF0LiBJdCBpcyBzaW1wbHkKPiBub3QgbWFuYWdl YWJsZSB0byBkbyBpdCBldmVyeSBub3cgYW5kIHRoZW4gYmVjYXVzZSB0aGVuIDMpIHdpbGwgc2lt cGx5Cj4gYmUgbmV2ZXIgc2FmZS4KPiAKPiBIYXZlIHlvdSBjb25zaWRlcmVkIGNvY2NpbmVsZSBv ciBzb21lIG90aGVyIHNjcmlwdGVkIHdheSB0byBkbyB0aGUKPiB0cmFuc2l0aW9uPyBJIGhhdmUg bm8gaWRlYSBob3cgdG8gZGVhbCB3aXRoIGZ1dHVyZSBjaGFuZ2VzIHRoYXQgd291bGQKPiBicmVh ayB0aGUgYmFsYW5jZSB0aG91Z2guCgpZZWFoLCB0aGF0J3Mgd2h5IEkndmUgYmVlbiBzdWdnZXN0 aW5nIGF0IExTRi9NTSB0aGF0IHdlIG1heSBuZWVkIHRvIGNyZWF0ZQphIGd1cCB3cmFwcGVyIC0g c2F5IHZhZGRyX3Bpbl9wYWdlcygpIC0gYW5kIHRyYWNrIHdoaWNoIHNpdGVzIGRyb3BwaW5nCnJl ZmVyZW5jZXMgZ290IGNvbnZlcnRlZCBieSB1c2luZyB0aGlzIHdyYXBwZXIgaW5zdGVhZCBvZiBn dXAuIFRoZQpjb3VudGVycGFydCB3b3VsZCB0aGVuIGJlIG1vcmUgbG9naWNhbGx5IG5hbWVkIGFz IHVucGluX3BhZ2UoKSBvciB3aGF0ZXZlcgppbnN0ZWFkIG9mIHB1dF91c2VyX3BhZ2UoKS4gIFN1 cmUgdGhpcyBpcyBub3QgY29tcGxldGVseSBmb29scHJvb2YgKHlvdSBjYW4KY3JlYXRlIG5ldyBj YWxsc2l0ZSB1c2luZyB2YWRkcl9waW5fcGFnZXMoKSBhbmQgdGhlbiBqdXN0IGRyb3AgcmVmcyB1 c2luZwpwdXRfcGFnZSgpKSBidXQgSSBzdXBwb3NlIGl0IHdvdWxkIGJlIGEgaGlnaCBlbm91Z2gg YmFycmllciBmb3IgbWlzc2VkCmNvbnZlcnNpb25zLi4uIFRob3VnaHRzPwoKCQkJCQkJCQlIb256 YQoKLS0gCkphbiBLYXJhIDxqYWNrQHN1c2UuY29tPgpTVVNFIExhYnMsIENSCgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBs aXN0Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2pl Y3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs