From patchwork Mon May 5 23:40:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 4118391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id E7911BFF02 for ; Tue, 6 May 2014 00:29:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 31BBE2022A for ; Tue, 6 May 2014 00:29:26 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 424AD20221 for ; Tue, 6 May 2014 00:29:25 +0000 (UTC) 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 1WhTDk-0002m1-Rk; Tue, 06 May 2014 00:26:56 +0000 Received: from mail-bn1lp0145.outbound.protection.outlook.com ([207.46.163.145] helo=na01-bn1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WhTDh-0002bn-EM for linux-arm-kernel@lists.infradead.org; Tue, 06 May 2014 00:26:54 +0000 Received: from CH1PR03CA002.namprd03.prod.outlook.com (10.255.156.147) by BLUPR03MB503.namprd03.prod.outlook.com (10.141.80.22) with Microsoft SMTP Server (TLS) id 15.0.934.12; Tue, 6 May 2014 00:26:30 +0000 Received: from BN1AFFO11FD012.protection.gbl (10.255.156.132) by CH1PR03CA002.outlook.office365.com (10.255.156.147) with Microsoft SMTP Server (TLS) id 15.0.939.12 via Frontend Transport; Tue, 6 May 2014 00:26:29 +0000 Received: from tx30smr01.am.freescale.net (192.88.168.1) by BN1AFFO11FD012.mail.protection.outlook.com (10.58.52.72) with Microsoft SMTP Server (TLS) id 15.0.929.8 via Frontend Transport; Tue, 6 May 2014 00:26:29 +0000 Received: from rock.ap.freescale.net (rock.ap.freescale.net [10.193.20.106]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id s460QFvj027151; Mon, 5 May 2014 17:26:23 -0700 From: Xiubo Li To: , Subject: [PATCH] ARM: LPAE: Update the comment to support the LPAE Date: Tue, 6 May 2014 07:40:56 +0800 Message-ID: <1399333256-10471-1-git-send-email-Li.Xiubo@freescale.com> X-Mailer: git-send-email 1.8.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.168.1; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10009001)(6009001)(199002)(189002)(86362001)(62966002)(20776003)(47776003)(81342001)(6806004)(93916002)(64706001)(81542001)(80022001)(77096999)(92566001)(92726001)(85852003)(83072002)(48376002)(87286001)(21056001)(79102001)(88136002)(4396001)(89996001)(87936001)(83322001)(19580405001)(19580395003)(44976005)(31966008)(74502001)(74662001)(76482001)(77982001)(50226001)(77156001)(50466002)(50986999)(46102001)(99396002)(36756003)(2101003); DIR:OUT; SFP:1101; SCL:1; SRVR:BLUPR03MB503; H:tx30smr01.am.freescale.net; FPR:; PTR:gate-tx3.freescale.com; A:1; MX:1; LANG:en; MIME-Version: 1.0 X-Forefront-PRVS: 0203C93D51 Received-SPF: Fail (: domain of freescale.com does not designate 192.88.168.1 as permitted sender) receiver=; client-ip=192.88.168.1; helo=tx30smr01.am.freescale.net; Authentication-Results: spf=fail (sender IP is 192.88.168.1) smtp.mailfrom=Li.Xiubo@freescale.com; X-OriginatorOrg: freescale.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140505_172653_574129_9C2C2C8D X-CRM114-Status: UNSURE ( 8.84 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.0 (/) Cc: Xiubo Li , linux-kernel@vger.kernel.org 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,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 Since the LPAE maybe enabled, so we should update the comment to support it. Signed-off-by: Xiubo Li --- arch/arm/kernel/head.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 914616e..005af2d 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -29,10 +29,10 @@ /* * swapper_pg_dir is the virtual address of the initial page table. - * We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must - * make sure that KERNEL_RAM_VADDR is correctly set. Currently, we expect - * the least significant 16 bits to be 0x8000, but we could probably - * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000. + * We place the page tables PG_DIR_SIZE below KERNEL_RAM_VADDR. Therefore, + * we must make sure that KERNEL_RAM_VADDR is correctly set. Currently, + * we expect the least significant 16 bits to be 0x8000, but we could probably + * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + PG_DIR_SIZE. */ #define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) #if (KERNEL_RAM_VADDR & 0xffff) != 0x8000