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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 81287C2BA19 for ; Tue, 14 Apr 2020 17:31:22 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 545A62054F for ; Tue, 14 Apr 2020 17:31:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="fmkkebMa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 545A62054F 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-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+VkW9/dyYW/BAQ25VncKQoRcJO87tqHW/msy/d6Nz00=; b=fmkkebMaHWvvj4 xWE3k7zMt/4ngv4eNKWk74clIknKTHKMx1q4yu0BVm16DY6VwML4AUWoxR9ydySuRZgESIrqWBvjo P3PIp/6oyjp5ixyOtBQgVxrZf9FzyqaEV4jLAL8Z8qQvHG0hMjswkcVtioaGdHeehc6Hz9/HLmhQB VWqEfcpSSVOeVVUjZYAwFnTojE3i27EpR1z5shyLLGaEtF1Ers9yXI+O/gp9t9BOaJ5vYAxbrmJax 68sI+G3aPfGVp0dp9V6Y3AprHUWSY7r9w+jKaBLZg0tzYotDBHyIJCgTY5hUxj1YERA8N6BNWS/XP HkHjD75/1ptfPfJMeEuA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOPP6-0004Lb-Lc; Tue, 14 Apr 2020 17:31:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jOPP2-0004KR-E3; Tue, 14 Apr 2020 17:31:17 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 834FC30E; Tue, 14 Apr 2020 10:31:15 -0700 (PDT) Received: from [192.168.0.14] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1A25F3F6C4; Tue, 14 Apr 2020 10:31:09 -0700 (PDT) Subject: Re: [PATCH 0/3] kexec/memory_hotplug: Prevent removal and accidental use To: Dave Young References: <20200326180730.4754-1-james.morse@arm.com> <20200330135522.GE6352@MiWiFi-R3L-srv> <2bdfbb1c-49da-d476-4a38-f91937105ae3@arm.com> <20200331034612.GB83248@dhcp-128-65.nay.redhat.com> From: James Morse Message-ID: <7cfeaf4e-a869-16be-3fe6-521a41d94508@arm.com> Date: Tue, 14 Apr 2020 18:31:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200331034612.GB83248@dhcp-128-65.nay.redhat.com> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200414_103116_529130_59F1B906 X-CRM114-Status: GOOD ( 14.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Baoquan He , Anshuman Khandual , Catalin Marinas , Bhupesh Sharma , kexec@lists.infradead.org, linux-mm@kvack.org, Eric Biederman , Andrew Morton , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dave, On 31/03/2020 04:46, Dave Young wrote: > I agreed that file load is still not widely used, but in the long run > we should not maintain both of them all the future time. Especially > when some kernel-userspace interfaces need to be introduced, file load > will have the natural advantage. We may keep the kexec_load for other > misc usecases, but we can use file load for the major modern > linux-to-linux loading. I'm not saying we can do it immediately, just > thought we should reduce the duplicate effort and try to avoid hacking if > possible. Sure. My aim here is to never debug this problem again. > Anyway about this particular issue, I wonder if we can just reload with > a udev rule as replied in another mail. What if it doesn't? I can't find such a rule on my debian machine. I don't think user-space can be relied on for something like this. The best we could hope for here is a dying gasp from the old kernel: | kexec: memory layout changed since kexec load, this may not work. | Bye! ... assuming anyone sees such a message. Thanks, James _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel