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=-15.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,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 4176AECDE4B for ; Thu, 8 Nov 2018 22:04:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F15A120844 for ; Thu, 8 Nov 2018 22:04:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Fw++toYZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F15A120844 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731372AbeKIHlr (ORCPT ); Fri, 9 Nov 2018 02:41:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:33458 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730305AbeKIHlr (ORCPT ); Fri, 9 Nov 2018 02:41:47 -0500 Received: from localhost (unknown [208.72.13.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C636F208A3; Thu, 8 Nov 2018 22:04:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541714656; bh=F3jrL2jwmsiLxXXIKCcJTywJZZ9z9376IycS1RLYVk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fw++toYZ5s7UV3C+QqoriYXXYAHwuf85lFaPh832vMe0dhTLVceE5OYi78F+IVJnY GHtQ3UYFnQ1y1pmO29H2f45DNGt9oppU3PT14023cYOjtTBNK9gDZe9upiHnsp+ITs KB4tCKVaQj4Lh7jtNfmQZYoHyeW2Mca6dG8sxJzQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Phil Elwell , Eric Anholt , Sasha Levin Subject: [PATCH 4.9 056/171] ARM: dts: bcm283x: Reserve first page for firmware Date: Thu, 8 Nov 2018 13:50:26 -0800 Message-Id: <20181108215131.551748040@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181108215127.257643509@linuxfoundation.org> References: <20181108215127.257643509@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit b0804ed0cadd7e38d94d2f15cdcc0d9695818856 ] The Raspberry Pi startup stub files for multi-core BCM283X processors make the secondary CPUs spin until the corresponding mailbox is written. These stubs are loaded at physical address 0x00000xxx (as seen by the ARMs), but this page will be reused by the kernel unless it is explicitly reserved, causing the waiting cores to execute random code. Use the /memreserve/ Device Tree directive to mark the first page as off-limits to the kernel. See: https://github.com/raspberrypi/linux/issues/1989 Signed-off-by: Phil Elwell Signed-off-by: Eric Anholt Reviewed-by: Eric Anholt Signed-off-by: Sasha Levin --- arch/arm/boot/dts/bcm283x.dtsi | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi index c51b88ee3cec..31563007772c 100644 --- a/arch/arm/boot/dts/bcm283x.dtsi +++ b/arch/arm/boot/dts/bcm283x.dtsi @@ -3,6 +3,11 @@ #include #include +/* firmware-provided startup stubs live here, where the secondary CPUs are + * spinning. + */ +/memreserve/ 0x00000000 0x00001000; + /* This include file covers the common peripherals and configuration between * bcm2835 and bcm2836 implementations, leaving the CPU configuration to * bcm2835.dtsi and bcm2836.dtsi. -- 2.17.1