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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 DA4F9CA9EA0 for ; Fri, 25 Oct 2019 18:09:27 +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 AB95C2070B for ; Fri, 25 Oct 2019 18:09:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TF66bwxV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB95C2070B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com 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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=aAag2yErrK7Br/HNWE78hU14jfxvthhFNIzTcG+IUH0=; b=TF66bwxVo+h8i2 arryt9IYuczIDM6hqPx7ze2cGGlEIGo/mQDQFS6pZb0LPDWAk4PQ0BHKmN291xxMtb8QF9uWJsmsJ bbcNKzU6kRKRbc/t4aBxxfCO6n2u5CySgclzQuHzG3VyzS15pFSdrfwinkXQEp80N6dwbaGcPNYpu fKXu4oRhtacR1Y0N3D7AJnKhXYYtNAcIh3vbRgivQ6H0ILRW751Hfwh1K5WS9wpV59OaOUapX/72z oX3hjk61JIQyLbgeteci7WmUxuOrEhP+0srJhkYYVRUIv6M5RKSMbUrHxcg7gOxiH4jR7p+bplKoi QVmY/48MdBw0DGk4IR8A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iO41e-0004SD-LE; Fri, 25 Oct 2019 18:09:26 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iO410-0003uK-Ka for linux-arm-kernel@lists.infradead.org; Fri, 25 Oct 2019 18:08:49 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 03DD5493; Fri, 25 Oct 2019 11:08:46 -0700 (PDT) Received: from e110467-lin.cambridge.arm.com (e110467-lin.cambridge.arm.com [10.1.197.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 490793F6C4; Fri, 25 Oct 2019 11:08:45 -0700 (PDT) From: Robin Murphy To: will@kernel.org Subject: [PATCH v2 03/10] iommu/io-pgtable-arm: Simplify bounds checks Date: Fri, 25 Oct 2019 19:08:32 +0100 Message-Id: X-Mailer: git-send-email 2.21.0.dirty In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191025_110846_714726_5CBC43FF X-CRM114-Status: GOOD ( 12.59 ) 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: iommu@lists.linux-foundation.org, jcrouse@codeaurora.org, linux-arm-kernel@lists.infradead.org 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 We're merely checking that the relevant upper bits of each address are all zero, so there are cheaper ways to achieve that. Signed-off-by: Robin Murphy --- drivers/iommu/io-pgtable-arm.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 2cef0f5335e4..a9dff0ecf0c3 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -491,8 +491,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return -EINVAL; - if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) || - paddr >= (1ULL << data->iop.cfg.oas))) + if (WARN_ON(iova >> data->iop.cfg.ias || paddr >> data->iop.cfg.oas)) return -ERANGE; prot = arm_lpae_prot_to_pte(data, iommu_prot); @@ -663,7 +662,7 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return 0; - if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias))) + if (WARN_ON(iova >> data->iop.cfg.ias)) return 0; return __arm_lpae_unmap(data, gather, iova, size, lvl, ptep); -- 2.21.0.dirty _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel