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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_NEOMUTT 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 461D8C6778A for ; Thu, 5 Jul 2018 18:35:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0385523FED for ; Thu, 5 Jul 2018 18:35:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0385523FED Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.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 S1754005AbeGESe6 (ORCPT ); Thu, 5 Jul 2018 14:34:58 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:54936 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753838AbeGESe5 (ORCPT ); Thu, 5 Jul 2018 14:34:57 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D5E4C7A9; Thu, 5 Jul 2018 11:34:56 -0700 (PDT) Received: from armageddon.cambridge.arm.com (armageddon.cambridge.arm.com [10.1.206.84]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C81723F2EA; Thu, 5 Jul 2018 11:34:55 -0700 (PDT) Date: Thu, 5 Jul 2018 19:34:53 +0100 From: Catalin Marinas To: "Nikunj Kela (nkela)" Cc: "xe-kernel@external.cisco.com" , Will Deacon , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH 2/2] arm64: add support for 43bit physical address Message-ID: <20180705183452.vaaxjsrus6lnqyzt@armageddon.cambridge.arm.com> References: <20180702210451.16057-2-nkela@cisco.com> <20180703145626.g6pb4bgnrle2p2qf@armageddon.cambridge.arm.com> <1530642932209.57184@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1530642932209.57184@cisco.com> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 03, 2018 at 06:35:32PM +0000, Nikunj Kela (nkela) wrote: > We are trying to reduce the memory allocation needed for kdump kernel. > We want to reserve less than 32M for kdump kernel if possible. We are > able to get ~14M saving by the proposed change. Have you tried disabling SPARSEMEM and using FLATMEM for this case? With 32M you wouldn't need more than a section anyway. It needs some tweaking of the arm64 Kconfig and probably fail to build. -- Catalin