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_PASS,URIBL_BLOCKED,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 95DF9C0044C for ; Thu, 1 Nov 2018 00:55:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3AD9920664 for ; Thu, 1 Nov 2018 00:55:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3AD9920664 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727277AbeKAJ4a (ORCPT ); Thu, 1 Nov 2018 05:56:30 -0400 Received: from 59-120-53-16.HINET-IP.hinet.net ([59.120.53.16]:47787 "EHLO ATCSQR.andestech.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725823AbeKAJ4a (ORCPT ); Thu, 1 Nov 2018 05:56:30 -0400 Received: from mail.andestech.com (atcpcs16.andestech.com [10.0.1.222]) by ATCSQR.andestech.com with ESMTP id wA10uZUK012526; Thu, 1 Nov 2018 08:56:35 +0800 (GMT-8) (envelope-from alankao@andestech.com) Received: from andestech.com (10.0.15.65) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.123.3; Thu, 1 Nov 2018 08:55:41 +0800 Date: Thu, 1 Nov 2018 08:55:42 +0800 From: Alan Kao To: Christoph Hellwig CC: Anup Patel , Zong Li , Albert Ou , Arnd Bergmann , , Palmer Dabbelt , "linux-kernel@vger.kernel.org List" , , , Subject: Re: [RFC 0/2] RISC-V: A proposal to add vendor-specific code Message-ID: <20181101005541.GA25604@andestech.com> References: <1540982130-28248-1-git-send-email-vincentc@andestech.com> <20181031141745.GA5183@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20181031141745.GA5183@infradead.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-Originating-IP: [10.0.15.65] X-DNSRBL: X-MAIL: ATCSQR.andestech.com wA10uZUK012526 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 31, 2018 at 07:17:45AM -0700, Christoph Hellwig wrote: > On Wed, Oct 31, 2018 at 04:46:10PM +0530, Anup Patel wrote: > > I agree that we need a place for vendor-specific ISA extensions and > > having vendor-specific directories is also good. > > The only sensible answer is that we should not allow vendor specific > extensions in the kernel at all. ... How can this even be possible if a extension includes an extra register set as some domain-specific context? In such a case, kernel should at least process the context during any context switch, just like how it deals with the FP context. > ... We need to standardize cache flushing > and we need to do it soon and not introduce horrible bandaids because > the foundation did not do its work. > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv