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, 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 4E1B0C4743D for ; Fri, 11 Jun 2021 06:54:13 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 60D3661374 for ; Fri, 11 Jun 2021 06:54:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 60D3661374 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4G1Wm3536gz3c25 for ; Fri, 11 Jun 2021 16:54:11 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4G1Wlc23s8z3079 for ; Fri, 11 Jun 2021 16:53:46 +1000 (AEST) Received: by verein.lst.de (Postfix, from userid 2407) id 0D2A168AFE; Fri, 11 Jun 2021 08:53:39 +0200 (CEST) Date: Fri, 11 Jun 2021 08:53:38 +0200 From: Christoph Hellwig To: Ira Weiny Subject: Re: [PATCH 09/16] ps3disk: use memcpy_{from,to}_bvec Message-ID: <20210611065338.GA31210@lst.de> References: <20210608160603.1535935-1-hch@lst.de> <20210608160603.1535935-10-hch@lst.de> <20210609014822.GT3697498@iweiny-DESK2.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210609014822.GT3697498@iweiny-DESK2.sc.intel.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , linux-arch@vger.kernel.org, Thomas Bogendoerfer , Mike Snitzer , Geoff Levand , ceph-devel@vger.kernel.org, linux-mips@vger.kernel.org, Dongsheng Yang , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@redhat.com, Thomas Gleixner , Ilya Dryomov , linuxppc-dev@lists.ozlabs.org, Christoph Hellwig Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jun 08, 2021 at 06:48:22PM -0700, Ira Weiny wrote: > I'm still not 100% sure that these flushes are needed but the are not no-ops on > every arch. Would it be best to preserve them after the memcpy_to/from_bvec()? > > Same thing in patch 11 and 14. To me it seems kunmap_local should basically always call the equivalent of flush_kernel_dcache_page. parisc does this through kunmap_flush_on_unmap, but none of the other architectures with VIVT caches or other coherency issues does. Does anyone have a history or other insights here?