From patchwork Sun Aug 27 16:10:25 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9923933 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F0CE860380 for ; Sun, 27 Aug 2017 16:13:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E3ABA28632 for ; Sun, 27 Aug 2017 16:13:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D7D0F28634; Sun, 27 Aug 2017 16:13:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6B38728632 for ; Sun, 27 Aug 2017 16:13:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751809AbdH0QM4 (ORCPT ); Sun, 27 Aug 2017 12:12:56 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:41822 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751301AbdH0QKy (ORCPT ); Sun, 27 Aug 2017 12:10:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Uwu+9A0z95q/irkl2CO2BDnLQWOKgUa9OVgShS5p5uE=; b=PJiOOCrt3FVLiLl+AWE3ThKB/ qKCRES1Doj/FHIaQapWEeMl8ZammS4W3YB3q95OB2QtaJcKVd7qFfs4Z9md1lSuSwZn7uz9rz7vXb HQmxnFU1og9u+ukxmlqnsMz7Tcx5e60JGHiyhEE1D6fG/EuuuoI2d7OZp9Cniix8icD9o2pW5m6vT V+mym6JJxxNVD2p1BhjGoB+WN0q5qCBkN1yP2aR2BxYkyOSuN7NtfWXbH6XTdqLGidnmyxkRhNsXa ZUN98M0i8Gl1OYREB5l22DpfN0sPmErsHAK7Jno/p4yhWJsAQcedahCxPIuX7FgvxPWh/L0ihXUsd hkJAzdZQg==; Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1dm09A-0006sA-Pe; Sun, 27 Aug 2017 16:10:49 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Marek Szyprowski , Robin Murphy , Michal Simek , David Howells , Guan Xuetao , Chris Zankel , Max Filippov , x86@kernel.org, linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 05/12] ia64: make dma_cache_sync a no-op Date: Sun, 27 Aug 2017 18:10:25 +0200 Message-Id: <20170827161032.22772-6-hch@lst.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170827161032.22772-1-hch@lst.de> References: <20170827161032.22772-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP ia64 does not implement DMA_ATTR_NON_CONSISTENT allocations, so it doesn't make any sense to do any work in dma_cache_sync given that it must be a no-op when dma_alloc_attrs returns coherent memory. Signed-off-by: Christoph Hellwig --- arch/ia64/include/asm/dma-mapping.h | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h index 3ce5ab4339f3..99dfc1aa9d3c 100644 --- a/arch/ia64/include/asm/dma-mapping.h +++ b/arch/ia64/include/asm/dma-mapping.h @@ -48,11 +48,6 @@ static inline void dma_cache_sync (struct device *dev, void *vaddr, size_t size, enum dma_data_direction dir) { - /* - * IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to - * ensure that dma_cache_sync() enforces order, hence the mb(). - */ - mb(); } #endif /* _ASM_IA64_DMA_MAPPING_H */