From patchwork Thu Jun 20 14:21:15 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 2756431 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5AD4C9F472 for ; Thu, 20 Jun 2013 14:24:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BF63C20381 for ; Thu, 20 Jun 2013 14:24:11 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 655B72037F for ; Thu, 20 Jun 2013 14:24:10 +0000 (UTC) Received: from merlin.infradead.org ([205.233.59.134]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UpflB-0006AP-Qf; Thu, 20 Jun 2013 14:22:50 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Upfkt-0000IA-CU; Thu, 20 Jun 2013 14:22:31 +0000 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UpfkI-0000Bk-BO for linux-arm-kernel@lists.infradead.org; Thu, 20 Jun 2013 14:21:56 +0000 Received: from mudshark.cambridge.arm.com (mudshark.cambridge.arm.com [10.1.203.36]) by cam-admin0.cambridge.arm.com (8.12.6/8.12.6) with ESMTP id r5KELUki015553; Thu, 20 Jun 2013 15:21:30 +0100 (BST) Received: by mudshark.cambridge.arm.com (Postfix, from userid 1000) id 41681C2B15; Thu, 20 Jun 2013 15:21:30 +0100 (BST) From: Will Deacon To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 01/12] ARM: mm: remove redundant dsb() prior to range TLB invalidation Date: Thu, 20 Jun 2013 15:21:15 +0100 Message-Id: <1371738086-6707-2-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 1.8.2.2 In-Reply-To: <1371738086-6707-1-git-send-email-will.deacon@arm.com> References: <1371738086-6707-1-git-send-email-will.deacon@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130620_102154_957286_3F5E70F0 X-CRM114-Status: GOOD ( 11.56 ) X-Spam-Score: -8.2 (--------) Cc: Will Deacon X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The kernel TLB range invalidation functions already contain dsb instructions before and after the maintenance, so there is no need to introduce additional barriers. Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- arch/arm/mm/dma-mapping.c | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index ef3e0f3..5baabf7 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -455,7 +455,6 @@ static void __dma_remap(struct page *page, size_t size, pgprot_t prot) unsigned end = start + size; apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot); - dsb(); flush_tlb_kernel_range(start, end); }