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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 453B3C49361 for ; Fri, 18 Jun 2021 13:20:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B805161400 for ; Fri, 18 Jun 2021 13:20:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B805161400 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3769B6B006E; Fri, 18 Jun 2021 09:20:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3273A6B0071; Fri, 18 Jun 2021 09:20:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1A11F6B0072; Fri, 18 Jun 2021 09:20:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0044.hostedemail.com [216.40.44.44]) by kanga.kvack.org (Postfix) with ESMTP id DAB716B006E for ; Fri, 18 Jun 2021 09:20:13 -0400 (EDT) Received: from smtpin34.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 72C26DB21 for ; Fri, 18 Jun 2021 13:20:13 +0000 (UTC) X-FDA: 78266903106.34.EB721B5 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) by imf23.hostedemail.com (Postfix) with ESMTP id E2852A00025F for ; Fri, 18 Jun 2021 13:20:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=OfU5Cc2TKMfWLUf4GRZWyAL3UpUGP7UR7XxGIF7IULA=; b=Ny4Yw8+FiO1zJsBQmDR+73C1H 5n4vMHWdIIkkjaBXur1bt3gqXM3XGBBVm4Y63dCHOlUCqHGCQC2i5QjfAfKVEAYh7AHQH/N1lqGg6 sfDGV9vm+aCB+rPtbJDEIzoQeuAjqn/ntJHhGna0TXuxFH7bxvULPU5wX3I9vioppdYpVWfoh0fod 5/F3b2bSYCOORgD63zEwKHmFuVKP/tUJoTgKuU8ivOQXN01TQZi9QMQZ8GZNsGqGIRc3gk0FT4R8O MFBiCa2ufLcqS1pF/KMi1211l5MxlOea2yJbby5Qqeihp/2cp6wCVCtthcTewRNBxgWIX2pYh/EL5 7IlkQwkPw==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:45128) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1luEPW-0001Tk-Tl; Fri, 18 Jun 2021 14:19:50 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1luEPQ-0007xo-Fo; Fri, 18 Jun 2021 14:19:44 +0100 Date: Fri, 18 Jun 2021 14:19:44 +0100 From: "Russell King (Oracle)" To: Linus Walleij Cc: Catalin Marinas , Krzysztof Halasa , Neil Armstrong , Peter Zijlstra , Andy Lutomirski , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , Dave Hansen , LKML , Linux Memory Management List , Andrew Morton , Mathieu Desnoyers , Nicholas Piggin , Linux ARM , Will Deacon Subject: Re: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE Message-ID: <20210618131944.GL22278@shell.armlinux.org.uk> References: <20210616103446.GC22278@shell.armlinux.org.uk> <20210616132226.GD22278@shell.armlinux.org.uk> <20210616150456.GC22433@arm.com> <20210616152326.GG22278@shell.armlinux.org.uk> <20210616154529.GD22433@arm.com> <20210616160050.GE22433@arm.com> <20210616162716.GH22278@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=armlinux.org.uk header.s=pandora-2019 header.b=Ny4Yw8+F; spf=none (imf23.hostedemail.com: domain of linux@armlinux.org.uk has no SPF policy when checking 78.32.30.218) smtp.mailfrom=linux@armlinux.org.uk; dmarc=pass (policy=none) header.from=armlinux.org.uk X-Stat-Signature: 97mhn8jpknghmxobqeu963pkmwusn7wm X-Rspamd-Queue-Id: E2852A00025F X-Rspamd-Server: rspam06 X-HE-Tag: 1624022412-281014 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jun 18, 2021 at 02:54:05PM +0200, Linus Walleij wrote: > On Wed, Jun 16, 2021 at 6:27 PM Russell King (Oracle) > wrote: > > > Arnd tells me that the current remaining ARM11MPCore users are: > > - CNS3xxx (where there is some martinal interest in the Gateworks > > Laguna platform) > > - Similar for OXNAS > > - There used to be the Realview MPCore tile - I haven't turned that on > > in ages, and it may be that the 3V cell that backs up the encryption > > keys is dead so it may not even boot. > > I have this machine with 4 x ARM11 MPCore, it works like a charm. > I use it to test exactly this kind of stuff, I know if a kernel works > on ARM11MPCore it works on anything because of how fragile > it is. > > > So it seems to come down to a question about CNS3xxx and OXNAS. If > > these aren't being used, maybe we can drop ARM11MPCore support and > > the associated platforms? > > > > Linus, Krzysztof, Neil, any input? > > I don't especially need to keep the ARM11MPCore machine alive, > it is just a testchip after all. The Oxnas is another story, that has wide > deployment and was contributed recently (2016) and has excellent > support in OpenWrt so I wouldn't really want > to axe that. So I suppose the next question is... are these issues (with userland self-modifying code and kernel module loading) entirely theoretical or can they be produced on real hardware? If they can't be produced on real hardware, and we attempt to fix them how do we know that the fix has worked... -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!