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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 386AAC43381 for ; Fri, 15 Feb 2019 18:35:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 155F8206C0 for ; Fri, 15 Feb 2019 18:35:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389406AbfBOSe7 (ORCPT ); Fri, 15 Feb 2019 13:34:59 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:43914 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388116AbfBOSe7 (ORCPT ); Fri, 15 Feb 2019 13:34:59 -0500 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::bf5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id B8BBE14F06A7D; Fri, 15 Feb 2019 10:34:58 -0800 (PST) Date: Fri, 15 Feb 2019 10:34:58 -0800 (PST) Message-Id: <20190215.103458.2233581578201067146.davem@davemloft.net> To: hch@lst.de Cc: deller@gmx.de, robin.murphy@arm.com, iommu@lists.linux-foundation.org, sparclinux@vger.kernel.org, linux-parisc@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/5] sparc64/iommu: allow large DMA masks From: David Miller In-Reply-To: <20190215144559.8777-4-hch@lst.de> References: <20190215144559.8777-1-hch@lst.de> <20190215144559.8777-4-hch@lst.de> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 15 Feb 2019 10:34:59 -0800 (PST) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org From: Christoph Hellwig Date: Fri, 15 Feb 2019 15:45:57 +0100 > We've been moving to a model where the device just sets the DMA mask > supported by it, instead of having to fallback to something it thinks > the platform might support. Sparc64 is the remaining holdout forcing > drivers to supply a matching mask. Change dma_4u_supported to just > check if the supplied dma mask is large enough as nothing in the > iommu.c code (or the core DMA code) actually looks at the DMA mask > later on. > > Signed-off-by: Christoph Hellwig Acked-by: David S. Miller