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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 49927C32750 for ; Tue, 13 Aug 2019 06:59:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1237F20644 for ; Tue, 13 Aug 2019 06:59:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Nq/fGvy8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727111AbfHMG7K (ORCPT ); Tue, 13 Aug 2019 02:59:10 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:43796 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725842AbfHMG7J (ORCPT ); Tue, 13 Aug 2019 02:59:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender: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=zMNiNrMNeZjIwy9f94q5MPmv2P//EE7hL1rarXbmCX8=; b=Nq/fGvy8xEaCzZljrTTTR22LP mNV1XttMyIg77O0HztY7BLRu05T9H/LAlJ5wwiu22p9PFgDY9Tp1TZquHXcH93marIZMc0iHEfn6z zNyuC+JbIyj+Zwe4IDW5ttAiYlyF+JDWJKsmd9boJ+vzywKxHVsxXc3c8Yi+3JxkoQjEt7TeUIoV6 H6Q6oxLY7iGA3MD64PJ22R+NywouwvhZyoADNDXcJIhRgHu/71ubU/elk167W66QLGfAeLi6J3Y7j upom5uslYp+Y5eNvuizw9PyWLHP8I/tyLRzkRhZlG3hYZZwEtERrY7Q49KTPuWwdXuuZnTsP4qkI3 0EsuT43mA==; Received: from hch by bombadil.infradead.org with local (Exim 4.92 #3 (Red Hat Linux)) id 1hxQlt-0005V1-O2; Tue, 13 Aug 2019 06:59:05 +0000 Date: Mon, 12 Aug 2019 23:59:05 -0700 From: Christoph Hellwig To: Charles Papon Cc: Christoph Hellwig , Atish Patra , linux-riscv , Bin Meng , linux-kernel , Paul Walmsley Subject: Re: [PATCH] riscv: kbuild: drop CONFIG_RISCV_ISA_C Message-ID: <20190813065905.GA21020@infradead.org> References: <20190812150348.GH26897@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 13, 2019 at 12:18:22AM +0200, Charles Papon wrote: > > Because it it the unix platform baseline as stated in the patch. > I know that, but i'm looking for arguments why RVC could't be kept as > an option, especialy it is only an optimisation option without > behavioral/code changes. > > That baseline make sense for heavy linux distributions, where you > expect everybody to compile with a baseline set of ISA extentions, to > make binary exchanges easier. > But for smaller systems, i do not see advantages having RVC forced. I don't fully agree with the benefits, but then again how little impact using the C extension has on the kernel build I'm now convinced that keeping it should be ok.