From patchwork Fri Nov 20 15:35:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 57076 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp561632lbb; Fri, 20 Nov 2015 07:51:06 -0800 (PST) X-Received: by 10.66.124.165 with SMTP id mj5mr19958547pab.97.1448034666075; Fri, 20 Nov 2015 07:51:06 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [198.137.202.9]) by mx.google.com with ESMTPS id f7si131649pat.97.2015.11.20.07.51.05 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Nov 2015 07:51:06 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) client-ip=198.137.202.9; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zznvx-0002Qz-75; Fri, 20 Nov 2015 15:49:09 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZznjI-00009l-PX for linux-arm-kernel@lists.infradead.org; Fri, 20 Nov 2015 15:36:10 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E11003A8; Fri, 20 Nov 2015 07:35:29 -0800 (PST) Received: from leverpostej.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 8ACFE3F267; Fri, 20 Nov 2015 07:35:44 -0800 (PST) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/2] arm64: mm: allow sections for unaligned bases Date: Fri, 20 Nov 2015 15:35:24 +0000 Message-Id: <1448033724-13846-2-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1448033724-13846-1-git-send-email-mark.rutland@arm.com> References: <1448033724-13846-1-git-send-email-mark.rutland@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151120_073605_262315_A414AAAF X-CRM114-Status: UNSURE ( 9.04 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -7.5 (-------) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-7.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [217.140.101.70 listed in list.dnswl.org] -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Steve Capper , Ard Biesheuvel , Catalin Marinas , Will Deacon , Laura Abbott MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Callees of __create_mapping may decide to create section mappings if sufficient low bits of the physical and virtual addresses they were passed are zero. While __create_mapping rounds the virtual base address down, it does not similarly round the phyiscal base address down, and hence non-zero bits in the physical address can prevent use of a section mapping, even where a whole next-level table would be used instead. Round down the physical base address in __create_mapping to enable all callees to always create section mappings when such a mapping is possible. Signed-off-by: Mark Rutland Cc: Ard Biesheuvel Cc: Catalin Marinas Cc: Laura Abbott Cc: Steve Capper Cc: Will Deacon --- arch/arm64/mm/mmu.c | 1 + 1 file changed, 1 insertion(+) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel Acked-by: Ard Biesheuvel diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 3b06afa..6467d57 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -307,6 +307,7 @@ static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) return; + phys &= PAGE_MASK; addr = virt & PAGE_MASK; length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));