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,URIBL_BLOCKED,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 46A90C3279B for ; Fri, 6 Jul 2018 17:47:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEAE7224C6 for ; Fri, 6 Jul 2018 17:47:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cisco.com header.i=@cisco.com header.b="Ra3bSb7u" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DEAE7224C6 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 S933978AbeGFRr1 (ORCPT ); Fri, 6 Jul 2018 13:47:27 -0400 Received: from alln-iport-6.cisco.com ([173.37.142.93]:59300 "EHLO alln-iport-6.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932895AbeGFRr0 (ORCPT ); Fri, 6 Jul 2018 13:47:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=736; q=dns/txt; s=iport; t=1530899246; x=1532108846; h=from:to:cc:subject:date:message-id; bh=VOkEMOnasABVk6w4/AXEel3N/8bUEXdjVLErUTbofj4=; b=Ra3bSb7uLA1fZFExcUatnibYFRxjKD/5E4yhtJU0Abuto4ftuc8JmS75 HR7jjRcfd4VUUUP4KRydPK80J6pYT/xx6NGjSRNAfs7Iw1KczZ9QMMF+i e1Y+vVhSoftEpwTFNZI34haTQ9RW6WUiKs+62pQMgOjEXLF/T4xKsR9qT Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0D+AADM+T5b/5xdJa1cGgEBAQEBAgE?= =?us-ascii?q?BAQEIAQEBAYNJgWEoi36MNZc3gXoLhGyCLyE0GAECAQECAQECbSiGNoE+ARK?= =?us-ascii?q?DIIF/AatAhFuDdIE6FIhZgVY/jm4CjTyMEwmPFwuNWJILgUE4gVIzGggbFYM?= =?us-ascii?q?kkHJPj1IBAQ?= X-IronPort-AV: E=Sophos;i="5.51,317,1526342400"; d="scan'208";a="138976924" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by alln-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Jul 2018 17:47:25 +0000 Received: from sjc-ads-3734.cisco.com (sjc-ads-3734.cisco.com [171.68.250.181]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id w66HlO2q012908; Fri, 6 Jul 2018 17:47:25 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 v3] arm64: add ARM64-specific support for flatmem Date: Fri, 6 Jul 2018 10:47:24 -0700 Message-Id: <20180706174724.44594-1-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 | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 42c090c..f5b4c49 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -775,6 +775,9 @@ config ARCH_SPARSEMEM_DEFAULT config ARCH_SELECT_MEMORY_MODEL def_bool ARCH_SPARSEMEM_ENABLE +config ARCH_FLATMEM_ENABLE + def_bool y + config HAVE_ARCH_PFN_VALID def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM -- 2.10.3.dirty