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=BAYES_00,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 DC141C433E1 for ; Tue, 18 Aug 2020 07:00:18 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 AB023206B5 for ; Tue, 18 Aug 2020 07:00:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="2uGKiyKM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB023206B5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.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=WVTqxJriyJVbrsAJyNssCIPIS4tB3PiBSFDMcFqLKQQ=; b=2uGKiyKMP0LdWzB9Wy3py83u6 hGz/wbB3/Bx1E8C1mdvtJVyEGC9kx/c4U8oIDNrWN2Oci5WiTVOqXUcia0gk4CpPrcwHv1lD/07pS yC3xr38XE8QPxV89BIhRFRGSDucNnBFHDfuG8chJ25+Pn4h42t1f+DMTCZH3WLrErdwQIrqEjzZuj UImoaMEkCnGAVObs70gqrpkX4hOCJwI5sE7PHfoDCqk6J3QiVo6mNLpXkYs7pViW+2rHxbBPFZtAq eT2wICmMYwfdEPT8L11zsNGwXRx1rynnY2eBAq0EitQz/ANIhtmm3BBFX78evA7OBs6JbYsf89g7m jdKze9qwA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k7vbT-0008RB-Uz; Tue, 18 Aug 2020 07:00:16 +0000 Received: from verein.lst.de ([213.95.11.211]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k7vbR-0008QD-B2 for linux-nvme@lists.infradead.org; Tue, 18 Aug 2020 07:00:14 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 20B3A68B02; Tue, 18 Aug 2020 09:00:11 +0200 (CEST) Date: Tue, 18 Aug 2020 09:00:10 +0200 From: Christoph Hellwig To: Cong Wang Subject: Re: [PATCH v5 1/3] net: introduce helper sendpage_ok() in include/linux/net.h Message-ID: <20200818070010.GA2365@lst.de> References: <20200816071518.6964-1-colyli@suse.de> <20200817054538.GA11705@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200818_030013_544824_D7AC805B X-CRM114-Status: GOOD ( 11.75 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , Vlastimil Babka , Sagi Grimberg , Chaitanya Kulkarni , Mikhail Skorzhinskii , Linux Kernel Network Developers , LKML , stable , Coly Li , linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Jan Kara , Philipp Reisner , Christoph Hellwig , Hannes Reinecke Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Mon, Aug 17, 2020 at 12:12:12PM -0700, Cong Wang wrote: > > So netdev people will have to understand and support PageSlab() or > page_count()? Yes. As they came up with that contrived rule what is acceptable for sendpage. No one else really knows and other subsystems like the block layer are perfectly fine with it. > > If it is unusual even for mm people, how could netdev people suppose > to understand this unusual mm bug? At least not any better. It is not a mm bug, it is a networking quirk. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme