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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C7D96C76196 for ; Tue, 11 Apr 2023 07:36:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BwiWubbqD1aKqdLSgiddglEFfkdVNIIFarpukpY1Tt0=; b=bPQfwA095K0bvN +VvEX//HJYmpMbF5Mq2m+Fg9tdNZE5ob3jhXYVMmeTk6/mIxBbsxVK4vgeQ2S647ehC2tNlzOxTMn av1Jid8chN9gnEdSbZhUIlwJPDR/AffOsgBn5UWivnKFC7ZlLDtG/Nat9P24+jivAgzfQffyP0+E0 JfDWlXq3Oqez86Q/bqO0NX2mls8y7bZuLWcwvnwJU/MoTpFaFCs1ddFi/6C+LgWmHKX/imoA9ULCW rQXm/aeofvQaO4bV/8dQlHWR3FVdM7xA4VHCQcyLFAQfBX5PiM8J17Jbi8/XFKQ/91q9z6m1oE2xh Wqg5hzfNV8QAR4iW5C1Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pm8Xt-00GkE6-2H; Tue, 11 Apr 2023 07:36:05 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pm8Xq-00GkD7-1t; Tue, 11 Apr 2023 07:36:03 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 881336224B; Tue, 11 Apr 2023 07:36:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DE4DC433EF; Tue, 11 Apr 2023 07:35:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681198561; bh=9ighdUcP/UTYLMiyXaga2dDu7U1Ozp7TXI7PHr3dDYU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pc3B3hgSIKCjI2c/0a4HjZdd2ehgt6z2AB/2lkt3ZD6vimWx/pG5aGfdOrQOKPqBx gjPeI3PzxplsapH8uFKl4f+UNMeQlirH6NJ6KQEL4JYpMdrlAhgc1e/+qQSLPnJ6Jt Z1r3Ty3+mnw9Oj7MUoOrTlHiUY2ndF8deB2I3KnvL3FWE7fXSuDRq+RSoWwlPp3c6D qv/asV3Ccah13L3j+wQu/EayolE5EbXi4uitIEu42TucY1rgfDOee6evA4HatXTpwF 6dJhup7XFRTiwuy8FxHXbRACloOKnZ5kfXVq4yfp6LSnzMlnfs/3XmYg/cP3gsVGh1 8lMMn383lj2Lw== Date: Tue, 11 Apr 2023 09:35:55 +0200 From: Simon Horman To: Chen Jiahao Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kexec@lists.infradead.org, linux-doc@vger.kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, conor.dooley@microchip.com, guoren@kernel.org, heiko@sntech.de, bjorn@rivosinc.com, alex@ghiti.fr, akpm@linux-foundation.org, atishp@rivosinc.com, bhe@redhat.com, thunder.leizhen@huawei.com Subject: Re: [PATCH -next v4 1/2] riscv: kdump: Implement crashkernel=X,[high,low] Message-ID: References: <20230410130553.3226347-1-chenjiahao16@huawei.com> <20230410130553.3226347-2-chenjiahao16@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230410130553.3226347-2-chenjiahao16@huawei.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230411_003602_682644_C98308FE X-CRM114-Status: GOOD ( 11.63 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, Apr 10, 2023 at 09:05:52PM +0800, Chen Jiahao wrote: > On riscv, the current crash kernel allocation logic is trying to > allocate within 32bit addressible memory region by default, if > failed, try to allocate without 4G restriction. > > In need of saving DMA zone memory while allocating a relatively large > crash kernel region, allocating the reserved memory top down in > high memory, without overlapping the DMA zone, is a mature solution. > Here introduce the parameter option crashkernel=X,[high,low]. > > One can reserve the crash kernel from high memory above DMA zone range > by explicitly passing "crashkernel=X,high"; or reserve a memory range > below 4G with "crashkernel=X,low". > > Signed-off-by: Chen Jiahao > Acked-by: Guo Ren > Reviewed-by: Zhen Lei Reviewed-by: Simon Horman _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv