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=-5.3 required=3.0 tests=BAYES_00, 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 3FE79C07E94 for ; Fri, 4 Jun 2021 15:39:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D96061402 for ; Fri, 4 Jun 2021 15:39:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229867AbhFDPlj (ORCPT ); Fri, 4 Jun 2021 11:41:39 -0400 Received: from gate.crashing.org ([63.228.1.57]:45009 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229675AbhFDPlj (ORCPT ); Fri, 4 Jun 2021 11:41:39 -0400 Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 154FZJvk020323; Fri, 4 Jun 2021 10:35:19 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 154FZIOg020322; Fri, 4 Jun 2021 10:35:18 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Fri, 4 Jun 2021 10:35:18 -0500 From: Segher Boessenkool To: Peter Zijlstra Cc: Linus Torvalds , will@kernel.org, paulmck@kernel.org, stern@rowland.harvard.edu, parri.andrea@gmail.com, boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr, akiyks@gmail.com, linux-kernel@vger.kernel.org, linux-toolchains@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [RFC] LKMM: Add volatile_if() Message-ID: <20210604153518.GD18427@gate.crashing.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i Precedence: bulk List-ID: X-Mailing-List: linux-toolchains@vger.kernel.org On Fri, Jun 04, 2021 at 01:44:37PM +0200, Peter Zijlstra wrote: > On naming (sorry Paul for forgetting that in the initial mail); while I > think using the volatile qualifier for the language feature (can we haz > plz, kthxbai) makes perfect sense, Paul felt that we might use a > 'better' name for the kernel use, ctrl_dep_if() was proposed. In standard C statements do not have qualifiers. Unless you can convince the ISO C committee to have them on "if", you will have a very hard time convincing any serious compiler to do this. Segher