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 1C9C9C433EF for ; Thu, 10 Mar 2022 08:05:00 +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=sNVUTFEzUGTbjfDoP1HK0Gy19p86xT6FALtF5+juFYk=; b=qJvPY1gV41Ax3+ 2zbBINxjOwxUGO3j9ICOU22obD0imzBenhWhmSAo1eOkCx+4GKD110Kj6/3VIurxYWzV6+BXAG+bx jZqVKe2Asaml31aYgZp5uuBSJoSLaRB8aBDqdJzJ+P8bdSz2Oox5rWZCsmywdbu0NpCv/XvypQgV4 iqQRY1DV2SwaqGjnXs4xDyfpnFi3dol8Or8BJ/htx7mq9cgmyMLE2MgxjDmgDxEDRpKfWBxY0JOEr +2a5UgcQBUsIf2OUz2C9I9Ocd0MT8iFj+w2K1JZmKnFvqsx1UqDvyZMwnh/b8kJftTsMOdCmYKRCZ stiEYGfkkK/sC/jDJ54Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nSDn1-00BpuF-U0; Thu, 10 Mar 2022 08:04:51 +0000 Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nSDn0-00Bptl-RQ; Thu, 10 Mar 2022 08:04:50 +0000 Date: Thu, 10 Mar 2022 00:04:50 -0800 From: Christoph Hellwig To: Palmer Dabbelt Cc: Christoph Hellwig , michael@michaelkloos.com, Paul Walmsley , aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] riscv: Work to remove kernel dependence on the M-extension Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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 Wed, Mar 09, 2022 at 11:34:25PM -0800, Palmer Dabbelt wrote: > If someone has hardware that lacks M and users care about running Linux on > that then I'm happy to support it. I'll still point out the silliness of > that decision, but if it's too late to change things then I'd rather support > the hardware. If it's one of these "fill out every possible allowed ISA > flavor, even if nobody has one that runs Linux" then I don't see a reason to > bother -- there's an infinite amount of allowable RISC-V implementations, > we'll all go crazy chasing them around. It's not like Linux had required M mode since the RISC-V port was merged upstream, so any new implementor really should know about it. And performance on anything that requires Linux will just be horrible. I could see a bit of an excuse for a nommu port. Anyway, this kind of patch really does need to state the why. And it better be a really good reason. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv