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[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.