From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753416AbdLVIrh (ORCPT ); Fri, 22 Dec 2017 03:47:37 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:60250 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751737AbdLVIre (ORCPT ); Fri, 22 Dec 2017 03:47:34 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Steve Capper , Will Deacon Subject: [PATCH 3.18 01/38] arm64: Initialise high_memory global variable earlier Date: Fri, 22 Dec 2017 09:46:14 +0100 Message-Id: <20171222084451.678700020@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171222084451.623495387@linuxfoundation.org> References: <20171222084451.623495387@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steve Capper commit f24e5834a2c3f6c5f814a417f858226f0a010ade upstream. The high_memory global variable is used by cma_declare_contiguous(.) before it is defined. We don't notice this as we compute __pa(high_memory - 1), and it looks like we're processing a VA from the direct linear map. This problem becomes apparent when we flip the kernel virtual address space and the linear map is moved to the bottom of the kernel VA space. This patch moves the initialisation of high_memory before it used. Fixes: f7426b983a6a ("mm: cma: adjust address limit to avoid hitting low/high memory boundary") Signed-off-by: Steve Capper Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman --- arch/arm64/mm/init.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -155,6 +155,8 @@ void __init arm64_memblock_init(void) /* 4GB maximum for 32-bit only capable devices */ if (IS_ENABLED(CONFIG_ZONE_DMA)) dma_phys_limit = max_zone_dma_phys(); + + high_memory = __va(memblock_end_of_DRAM() - 1) + 1; dma_contiguous_reserve(dma_phys_limit); memblock_allow_resize(); @@ -177,7 +179,6 @@ void __init bootmem_init(void) sparse_init(); zone_sizes_init(min, max); - high_memory = __va((max << PAGE_SHIFT) - 1) + 1; max_pfn = max_low_pfn = max; }