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,USER_AGENT_MUTT 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 D5011C43613 for ; Mon, 24 Jun 2019 11:55:14 +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 AA8A62133F for ; Mon, 24 Jun 2019 11:55:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="AdmAVEHD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AA8A62133F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+infradead-linux-riscv=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:References: Message-ID:Subject: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=A00WoRB0LeU5nkwavMiAHQ1v/bmEgKNNlYIX6KYDlZw=; b=AdmAVEHD9jJyI5 f/vTMQBDQJJJin/sbMhrTRT3a3ojGPTT4lkjUa5mGjs7xXxHd2cakTdJh3aQY4y0GWn/3v7NNZOMH q1vkAhbFSB4DrbNBsx4UcAy7K9cS9KgQWjLTrE+pPYDV9QYfWjPQ1HJmAv6IBEScYf1M9ICtxb2z2 JzinYLtU4gWT2nJTqpbotGixyWaCQTxQ9LmO6AX6Gx/mZERIRRcTOrgP8s7QJWUBmt3CKNuDMR3GD GydlHi3dt3w7S56gIq+b5S3UsK1njFagfO+/TV6thQjA/zdXgD6B8RywwwjBCeBVEY+tg+teWw+I0 qIigw0o9f24glakko5Hg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfNZ0-0007cF-D8; Mon, 24 Jun 2019 11:55:10 +0000 Received: from verein.lst.de ([213.95.11.211] helo=newverein.lst.de) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hfNYr-0006pP-HV for linux-riscv@lists.infradead.org; Mon, 24 Jun 2019 11:55:09 +0000 Received: by newverein.lst.de (Postfix, from userid 2407) id 647BB68B02; Mon, 24 Jun 2019 13:54:29 +0200 (CEST) Date: Mon, 24 Jun 2019 13:54:28 +0200 From: Christoph Hellwig To: Vladimir Murzin Subject: Re: RISC-V nommu support v2 Message-ID: <20190624115428.GA9538@lst.de> References: <20190624054311.30256-1-hch@lst.de> <28e3d823-7b78-fa2b-5ca7-79f0c62f9ecb@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <28e3d823-7b78-fa2b-5ca7-79f0c62f9ecb@arm.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190624_045507_607118_48444BE9 X-CRM114-Status: UNSURE ( 7.82 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Damien Le Moal , Palmer Dabbelt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Paul Walmsley , linux-riscv@lists.infradead.org, Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, Jun 24, 2019 at 12:47:07PM +0100, Vladimir Murzin wrote: > Since you are using binfmt_flat which is kind of 32-bit only I was expecting to see > CONFIG_COMPAT (or something similar to that, like ILP32) enabled, yet I could not > find it. There is no such thing in RISC-V. I don't know of any 64-bit RISC-V cpu that can actually run 32-bit RISC-V code, although in theory that is possible. There also is nothing like the x86 x32 or mips n32 mode available either for now. But it turns out that with a few fixes to binfmt_flat it can run 64-bit binaries just fine. I sent that series out a while ago, and IIRC you actually commented on it. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_MUTT 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 2BFD1C43613 for ; Mon, 24 Jun 2019 11:55:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CC09D212F5 for ; Mon, 24 Jun 2019 11:55:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC09D212F5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 699DA8E0006; Mon, 24 Jun 2019 07:55:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 64A488E0002; Mon, 24 Jun 2019 07:55:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5386F8E0006; Mon, 24 Jun 2019 07:55:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by kanga.kvack.org (Postfix) with ESMTP id 1B41A8E0002 for ; Mon, 24 Jun 2019 07:55:01 -0400 (EDT) Received: by mail-wr1-f72.google.com with SMTP id g13so1097627wrb.3 for ; Mon, 24 Jun 2019 04:55:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:message-id:references:mime-version:content-disposition :in-reply-to:user-agent; bh=1aGT1T5nbQpmPAM03lWMCmYdwSD2s2w2P4atC5NfPRE=; b=XIEhjrWJJ8vXk79gfaE2G77uuIG0WblexQBRi8WgFAAs+/SL6KjbpGfCCYTyWrMQle rWr8ehTaVt1sFPqMAXkxvY9+BbQL5+9y2ONxElROK1QGmcE3iGTzMuyVZ/nuDkXklsKm ttmgDVOpkO/92Ymtn62ihmutPxWlv8wperzQ55T8aPPdeZ3PRoe7dFeWKbtcazsfiReV iQl/wB1OvMzIcMMvydcEkMb4lA8El57agJ7cFgX9SHwvSd2daLoWqTFWERTqPMCe8l/d Ug9TX7dwX9d0aSqc+daoVZvGutZEaEIXNXcSUkPYasYh/zvItstjWr1zMI95bqR3dEjk yQEw== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of hch@lst.de designates 213.95.11.211 as permitted sender) smtp.mailfrom=hch@lst.de X-Gm-Message-State: APjAAAXRMgo40bYYk7oykKfh4HKJXynw1hRySocSNDNIh+y5Ouy+nYTZ KT/1y3ksq8yG+jdlfnMPfnPfYIsjXvYm1ytY0cp0E1IQV7HXPDFAEa5VxjXJSTAI+pG93wngYq7 BASUpOt/86L8bLaBtYyCj03gvdiphodlb2jXQcdP6JuDIGlWmnOKqryka1ld0pFQPZg== X-Received: by 2002:a5d:6b12:: with SMTP id v18mr29949444wrw.306.1561377300699; Mon, 24 Jun 2019 04:55:00 -0700 (PDT) X-Google-Smtp-Source: APXvYqyGsp4JrSk1UxLTwfL0m/P8Ubbf8t/OgI/M7SE732m5iLjcPocoeKf+a22u00oQeU37JnIG X-Received: by 2002:a5d:6b12:: with SMTP id v18mr29949400wrw.306.1561377300017; Mon, 24 Jun 2019 04:55:00 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1561377300; cv=none; d=google.com; s=arc-20160816; b=jzb473uLL9uYbo+OmXIbS2443J/O0N0PVdvYYPlMB+epu8DH0ybHQetGlTVwoiYnbW /r2FCCmfgM3/1LcEXTN23uwtBgLtLg1sYkbDJfNU4vVMJBMyRXNvwvWV+b/8jU/F+jCp k+D4HIEskddnyLt++KYASaOcg5TbpR/eihPuGgmK1UaXDht7epM+N97rd9I3Rewu55jw 53HbFTS1Usy4Vz3aSa9Glm1EKbJdI61ARWzyeYwe+rBfv1M2t10XmJpAnDakbdUbL7uo j+W6MVlUjwQUIT8iMn4lV7DGSAoYtAJVkztJor0gUucW//b0MeOTpDHdlOrRWxKDRCkJ 27vw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date; bh=1aGT1T5nbQpmPAM03lWMCmYdwSD2s2w2P4atC5NfPRE=; b=mf0aodjnbGvJ+AFsH4iO9zGDHJaY2DJ0Zd0SW2IdyzVUBBaXoIQ1S1FDDpBloPLUtL hk5IpZfP3U1wHnmGvT0w/SR5Gh3lBNc0xCIc4UaUrxIa9CLp7MJ64xKT0grRac9CR7Xf BUk/I4TzGYvF9YmsDyEK5BXx9QMHgk0zduCRbH3CoGOsb+MUy8xxdmuGIF3lqiO1RyXo jCYXnv9mjL2NYTFliOkKVwU8HhgoOLlrAmQTPmLUkNv9lyQMHhlFL4hRAUduTb81YwAD /+GXAHQgKojbLLw1pgpwtxGnWV1fBOXAQezJUq5qIoto6tS4Hr8829qC2T+vKjx3/D9d 6zlA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of hch@lst.de designates 213.95.11.211 as permitted sender) smtp.mailfrom=hch@lst.de Received: from newverein.lst.de (verein.lst.de. [213.95.11.211]) by mx.google.com with ESMTPS id a17si9016835wrs.247.2019.06.24.04.54.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Jun 2019 04:55:00 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of hch@lst.de designates 213.95.11.211 as permitted sender) client-ip=213.95.11.211; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of hch@lst.de designates 213.95.11.211 as permitted sender) smtp.mailfrom=hch@lst.de Received: by newverein.lst.de (Postfix, from userid 2407) id 647BB68B02; Mon, 24 Jun 2019 13:54:29 +0200 (CEST) Date: Mon, 24 Jun 2019 13:54:28 +0200 From: Christoph Hellwig To: Vladimir Murzin Cc: Christoph Hellwig , Palmer Dabbelt , Paul Walmsley , Damien Le Moal , linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: RISC-V nommu support v2 Message-ID: <20190624115428.GA9538@lst.de> References: <20190624054311.30256-1-hch@lst.de> <28e3d823-7b78-fa2b-5ca7-79f0c62f9ecb@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <28e3d823-7b78-fa2b-5ca7-79f0c62f9ecb@arm.com> User-Agent: Mutt/1.5.17 (2007-11-01) 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 Mon, Jun 24, 2019 at 12:47:07PM +0100, Vladimir Murzin wrote: > Since you are using binfmt_flat which is kind of 32-bit only I was expecting to see > CONFIG_COMPAT (or something similar to that, like ILP32) enabled, yet I could not > find it. There is no such thing in RISC-V. I don't know of any 64-bit RISC-V cpu that can actually run 32-bit RISC-V code, although in theory that is possible. There also is nothing like the x86 x32 or mips n32 mode available either for now. But it turns out that with a few fixes to binfmt_flat it can run 64-bit binaries just fine. I sent that series out a while ago, and IIRC you actually commented on it.