Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755383AbaDKIKQ (ORCPT ); Fri, 11 Apr 2014 04:10:16 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:6354 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750817AbaDKIKC (ORCPT ); Fri, 11 Apr 2014 04:10:02 -0400 From: Liu Hua To: CC: , , , , , , , , Liu Hua Subject: [PATCH v2 0/2] change ARM linux memory layout to support 32 CPUs Date: Fri, 11 Apr 2014 16:00:50 +0800 Message-ID: <1397203252-22977-1-git-send-email-sdu.liu@huawei.com> X-Mailer: git-send-email 1.9.0 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.197.247] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Nicolas or Russell, This patch series change fixmap mapping region to suppport 32 CPUs. Because the "top_pmd" covers 0xfffe0000 - 0xffffffff(2M). And part is used by vector table. So I move this region down to 0xffc00000 - 0xffdffff. I have tested the patches on arma9(2 CPUs) and arma15(16 CPUs) platforms BTW, As we know we can configure NR_CPUS up to 32. So we need 2048K at most. But for ARM systems with less cpus, there is a waste of virtual address. So should we change its size according to NR_CPUS, as what MIPS linux does ? Changes from v1: --------------- - changed documentation for ARM linux memory layout. - moved fixmap mapping region, not just extended. Liu Hua (2): ARM : DMA : remove useless information about DMA ARM : extend fixmap mapping region to support 32 CPUs Documentation/arm/memory.txt | 8 ++------ arch/arm/include/asm/fixmap.h | 4 ++-- arch/arm/include/asm/highmem.h | 1 + arch/arm/include/asm/memory.h | 2 -- arch/arm/mm/highmem.c | 10 +++++----- arch/arm/mm/mm.h | 7 +++++++ arch/arm/mm/mmu.c | 4 ++++ mm/highmem.c | 1 + 8 files changed, 22 insertions(+), 15 deletions(-) -- 1.9.0 -- 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/