From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, T_DKIMWL_WL_MED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BEC2C6778C for ; Fri, 6 Jul 2018 17:02:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E2A63216FC for ; Fri, 6 Jul 2018 17:02:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cisco.com header.i=@cisco.com header.b="ReWWCqdM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E2A63216FC Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=cisco.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933987AbeGFRCS (ORCPT ); Fri, 6 Jul 2018 13:02:18 -0400 Received: from rcdn-iport-4.cisco.com ([173.37.86.75]:26410 "EHLO rcdn-iport-4.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933633AbeGFRCQ (ORCPT ); Fri, 6 Jul 2018 13:02:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=758; q=dns/txt; s=iport; t=1530896536; x=1532106136; h=from:to:cc:subject:date:message-id; bh=KcggRjJdx4fmHj2hrArU96li1Xa04sMQNVqDWZef9JI=; b=ReWWCqdM/8I9oBL3WH+/UOurD/d4efETLun6fabacfZa56BV9Sb0Y56J QdXQH36FeBh9ForQ7HoHw7OpLbdsUjtnYgAic43/XsO9RX0MsLIzl1fcN xh/bVsUFDeeJvg0bYtKhaychM0ZW1vSiEfY5X/5qMy29QVTGuDCdQUItp 0=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0D+AADM+T5b/5JdJa1cGgEBAQEBAgE?= =?us-ascii?q?BAQEIAQEBAYNJgWEoi36MNZc3gXoLhGyCLyE0GAECAQECAQECbSiGNoE+ARK?= =?us-ascii?q?DIIF/AatAhFuDdIE6FIhZgVY/gQ+NXwKNPIwTCY8XC41YkguBQTiBUjMaCBs?= =?us-ascii?q?VgySQck+PUgEB?= X-IronPort-AV: E=Sophos;i="5.51,317,1526342400"; d="scan'208";a="420042355" Received: from rcdn-core-10.cisco.com ([173.37.93.146]) by rcdn-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Jul 2018 17:02:16 +0000 Received: from sjc-ads-3734.cisco.com (sjc-ads-3734.cisco.com [171.68.250.181]) by rcdn-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id w66H2F4a027907; Fri, 6 Jul 2018 17:02:15 GMT From: Nikunj Kela To: Catalin Marinas , Will Deacon Cc: xe-kernel@external.cisco.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] arm64: add ARM64-specific support for flatmem Date: Fri, 6 Jul 2018 10:02:15 -0700 Message-Id: <20180706170215.56116-1-nkela@cisco.com> X-Mailer: git-send-email 2.10.3.dirty X-Auto-Response-Suppress: DR, OOF, AutoReply Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Flatmem is useful in reducing kernel memory usage. One usecase is in kdump kernel. We are able to save ~14M by moving to flatmem scheme. Cc: xe-kernel@external.cisco.com Cc: Nikunj Kela Signed-off-by: Nikunj Kela --- arch/arm64/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 42c090c..96ab9a7 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -775,6 +775,10 @@ config ARCH_SPARSEMEM_DEFAULT config ARCH_SELECT_MEMORY_MODEL def_bool ARCH_SPARSEMEM_ENABLE +config ARCH_FLATMEM_ENABLE + def_bool y + depends on !NUMA + config HAVE_ARCH_PFN_VALID def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM -- 2.10.3.dirty