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=-2.2 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_MUTT 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 E1617C31E4B for ; Fri, 14 Jun 2019 15:06:38 +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 B640720866 for ; Fri, 14 Jun 2019 15:06:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="FhELSOxT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B640720866 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-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=Sk4TftXt8GDRe55Gg2jLkR49c85awi+QHc0bmU1XgOo=; b=FhELSOxTy2IZGJ 5u7oNm2VAOjOXToPCTPjJttcSZSfmdKDLPbuXUKGo8iQLEaGnVAsbpeqM3iiFkNM2jtFOyVZif/CV qW2hqXVI/B4lLbSHp844spWTZingkj6JgBemMtQO7ka/PaqFkVAou3yyaZsYU4L9+TBwV3HoIaFfN 2lfJokmjkdCYr5N+uOi5RPFw5on+kpmho+S5iXl2Zm0xYcX5Ie720PHnGvSUzRSmS7o3hJSJb8qCq /KGo36FRy9B3V0IgNazgWEVz3wZPrI43rZ8ODaiO9YpiQyr/gpDqiED47Mqt9+LnqJ0GL8hiHoe6I 8c1HCZZfEXzQE9yAOUAg==; 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 1hbnmh-0005f5-IN; Fri, 14 Jun 2019 15:06:31 +0000 Received: from verein.lst.de ([213.95.11.211] helo=newverein.lst.de) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hbnme-0005e7-L1 for linux-arm-kernel@lists.infradead.org; Fri, 14 Jun 2019 15:06:29 +0000 Received: by newverein.lst.de (Postfix, from userid 2407) id 9BFFD68AFE; Fri, 14 Jun 2019 17:05:58 +0200 (CEST) Date: Fri, 14 Jun 2019 17:05:58 +0200 From: 'Christoph Hellwig' To: David Laight Subject: Re: [PATCH 16/16] dma-mapping: use exact allocation in dma_alloc_contiguous Message-ID: <20190614150558.GA9402@lst.de> References: <20190614134726.3827-1-hch@lst.de> <20190614134726.3827-17-hch@lst.de> <20190614145001.GB9088@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-20190614_080628_845016_F11ADB4E X-CRM114-Status: UNSURE ( 7.64 ) X-CRM114-Notice: Please train this message. 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: Maxime Ripard , Joonas Lahtinen , "dri-devel@lists.freedesktop.org" , "linux-mm@kvack.org" , 'Christoph Hellwig' , "devel@driverdev.osuosl.org" , "linux-s390@vger.kernel.org" , "linux-rdma@vger.kernel.org" , David Airlie , "linux-media@vger.kernel.org" , Intel Linux Wireless , "intel-gfx@lists.freedesktop.org" , Maarten Lankhorst , Jani Nikula , Ian Abbott , Rodrigo Vivi , Sean Paul , "moderated list:ARM PORT" , "netdev@vger.kernel.org" , "linux-wireless@vger.kernel.org" , "linux-kernel@vger.kernel.org" , H Hartley Sweeten , "iommu@lists.linux-foundation.org" , Daniel Vetter 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, Jun 14, 2019 at 03:01:22PM +0000, David Laight wrote: > I'm pretty sure there is a lot of code out there that makes that assumption. > Without it many drivers will have to allocate almost double the > amount of memory they actually need in order to get the required alignment. > So instead of saving memory you'll actually make more be used. That code would already be broken on a lot of Linux platforms. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel