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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 95B91C0044D for ; Mon, 16 Mar 2020 09:14:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6CDC220658 for ; Mon, 16 Mar 2020 09:14:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6CDC220658 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1D4056B0005; Mon, 16 Mar 2020 05:14:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 188FC6B0007; Mon, 16 Mar 2020 05:14:12 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 073636B0008; Mon, 16 Mar 2020 05:14:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0239.hostedemail.com [216.40.44.239]) by kanga.kvack.org (Postfix) with ESMTP id E28E06B0005 for ; Mon, 16 Mar 2020 05:14:11 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id BA9ED181AC9BF for ; Mon, 16 Mar 2020 09:14:11 +0000 (UTC) X-FDA: 76600663902.02.crate70_77e0f6fa4160 X-HE-Tag: crate70_77e0f6fa4160 X-Filterd-Recvd-Size: 1755 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Mon, 16 Mar 2020 09:14:11 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 8610368CEC; Mon, 16 Mar 2020 10:14:09 +0100 (CET) Date: Mon, 16 Mar 2020 10:14:09 +0100 From: Christoph Hellwig To: Jason Gunthorpe Cc: Jerome Glisse , Ralph Campbell , Felix.Kuehling@amd.com, linux-mm@kvack.org, John Hubbard , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Philip Yang Subject: Re: [PATCH hmm 9/8] mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd() Message-ID: <20200316091409.GI12439@lst.de> References: <20200311183506.3997-1-jgg@ziepe.ca> <20200312193310.GA1190@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200312193310.GA1190@ziepe.ca> User-Agent: Mutt/1.5.17 (2007-11-01) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 12, 2020 at 04:33:10PM -0300, Jason Gunthorpe wrote: > pmd_to_hmm_pfn_flags() already checks it and makes the cpu flags 0. If no > fault is requested then the pfns should be returned with the not valid > flags. > > It should not unconditionally fault if faulting is not requested. > > Fixes: 2aee09d8c116 ("mm/hmm: change hmm_vma_fault() to allow write fault on page basis") > Signed-off-by: Jason Gunthorpe > --- > mm/hmm.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > Bonus patch, this one got found after I made the series.. Looks good, Reviewed-by: Christoph Hellwig