Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757499AbcDEI2R (ORCPT ); Tue, 5 Apr 2016 04:28:17 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:51691 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754902AbcDEI2P (ORCPT ); Tue, 5 Apr 2016 04:28:15 -0400 From: Chen Feng To: , , , , , , , , , , , CC: , , , , , , , , , Subject: [PATCH 1/2] arm64: mem-model: add flatmem model for arm64 Date: Tue, 5 Apr 2016 16:22:51 +0800 Message-ID: <1459844572-53069-1-git-send-email-puck.chen@hisilicon.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.184.163.62] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0203.570375E9.0063,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: d263db39f737dda0b4a13271db4032b8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 777 Lines: 31 We can reduce the memory allocated at mem-map by flatmem. currently, the default memory-model in arm64 is sparse memory. The mem-map array is not freed in this scene. If the physical address is too long, it will reserved too much memory for the mem-map array. Signed-off-by: Chen Feng Signed-off-by: Fu Jun --- arch/arm64/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4f43622..c18930d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -559,6 +559,9 @@ config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_VMEMMAP_ENABLE +config ARCH_FLATMEM_ENABLE + def_bool y + config ARCH_SPARSEMEM_DEFAULT def_bool ARCH_SPARSEMEM_ENABLE -- 1.9.1