Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932670Ab0KLSBw (ORCPT ); Fri, 12 Nov 2010 13:01:52 -0500 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:50935 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932562Ab0KLSBS (ORCPT ); Fri, 12 Nov 2010 13:01:18 -0500 From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Will Deacon Subject: [PATCH v2 16/20] ARM: LPAE: mark memory banks with start > ULONG_MAX as highmem Date: Fri, 12 Nov 2010 18:00:36 +0000 Message-Id: <1289584840-18097-17-git-send-email-catalin.marinas@arm.com> X-Mailer: git-send-email 1.7.3.2.164.g6f10c In-Reply-To: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> References: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> X-OriginalArrivalTime: 12 Nov 2010 18:00:54.0032 (UTC) FILETIME=[8C913100:01CB8293] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1666 Lines: 44 From: Will Deacon Memory banks living outside of the 32-bit physical address space do not have a 1:1 pa <-> va mapping and therefore the __va macro may wrap. This patch ensures that such banks are marked as highmem so that the Kernel doesn't try to split them up when it sees that the wrapped virtual address overlaps the vmalloc space. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm/mm/mmu.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index b03e431..787a409 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -785,7 +785,8 @@ static void __init sanity_check_meminfo(void) #ifdef CONFIG_HIGHMEM if (__va(bank->start) > vmalloc_min || - __va(bank->start) < (void *)PAGE_OFFSET) + __va(bank->start) < (void *)PAGE_OFFSET || + bank->start > ULONG_MAX) highmem = 1; bank->highmem = highmem; @@ -794,7 +795,7 @@ static void __init sanity_check_meminfo(void) * Split those memory banks which are partially overlapping * the vmalloc area greatly simplifying things later. */ - if (__va(bank->start) < vmalloc_min && + if (!highmem && __va(bank->start) < vmalloc_min && bank->size > vmalloc_min - __va(bank->start)) { if (meminfo.nr_banks >= NR_BANKS) { printk(KERN_CRIT "NR_BANKS too low, " -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/