Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755135AbaJWPgc (ORCPT ); Thu, 23 Oct 2014 11:36:32 -0400 Received: from mail-pd0-f171.google.com ([209.85.192.171]:32806 "EHLO mail-pd0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751525AbaJWPga convert rfc822-to-8bit (ORCPT ); Thu, 23 Oct 2014 11:36:30 -0400 From: Minfei Huang Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Subject: [PATCH] mm: Avoid overlap the fixmap area on i386 Date: Thu, 23 Oct 2014 23:36:17 +0800 Message-Id: <6B680A9E-6CE9-4C96-934B-CB01DCB58278@gmail.com> Cc: x86@kernel.org, linux-kernel@vger.kernel.org To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1990.1\)) X-Mailer: Apple Mail (2.1990.1) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Minfei Huang It is a problem when configuring high memory off where the vmalloc reserve area could end up overlapping the early_ioremap fixmap area on i386. The ordering of the VMALLOC_RESERVE space is: FIXADDR_TOP fixed_addresses FIXADDR_START early_ioremap fixed addresses FIXADDR_BOOT_START Persistent kmap area PKMAP_BASE VMALLOC_END Vmalloc area VMALLOC_START high_memory The available address we can use is lower than FIXADDR_BOOT_START. So We will set the kmap boundary below the FIXADDR_BOOT_START, if configure the high memory. If we configure the high memory, the vmalloc reserve area should end up to PKMAP_BASE, otherwise should end up to FIXADDR_BOOT_START. Signed-off-by: Minfei Huang --- arch/x86/include/asm/pgtable_32_types.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h index ed5903b..2ac5fc8 100644 --- a/arch/x86/include/asm/pgtable_32_types.h +++ b/arch/x86/include/asm/pgtable_32_types.h @@ -43,7 +43,7 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */ #ifdef CONFIG_HIGHMEM # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) #else -# define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE) +# define VMALLOC_END (FIXADDR_BOOT_START - 2 * PAGE_SIZE) #endif #define MODULES_VADDR VMALLOC_START -- 1.8.3.1-- 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/