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=-5.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 A6785C433DF for ; Fri, 3 Jul 2020 13:25:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8722F20760 for ; Fri, 3 Jul 2020 13:25:38 +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="zDmqGVF3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726276AbgGCNZe (ORCPT ); Fri, 3 Jul 2020 09:25:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33270 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726022AbgGCNZe (ORCPT ); Fri, 3 Jul 2020 09:25:34 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BACF4C08C5C1; Fri, 3 Jul 2020 06:25:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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; bh=mTUdInrl0UZ5/CAUTtR8K6FDHzAHWr9fq3pJX4MJ7Gs=; b=zDmqGVF3FOX7aSDK4H8sAB/UGf KrxUneT0wbec5AHPOWFWgsQ58J7O+x9kLSh6PJJns7NSEVQU5N9HLWo16vbkLGQakk7aa0dWh7QcL grhzH9Vhd13yLmAKDlzxBAGgMJUMhc2N63hyENk4ip1OBwF3lMnThKgxhGjHOf93UVGDhIJabxxdh PUNVs3yxqSKjZQoFoCbxqN8YldUcpszlAWVdmsX979wqXUgCBvBmOoPH/nHcee/NLh6hdRgtBFf9u OxuXx54Xhpa+MCreoZf20laWaE2S6iSRhTAi9+Q78S4yOV4Vk9Mo0GC1/n+tL0uvPfxff2DnoUFjs DrqF4xAQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jrLgy-0002iy-Rt; Fri, 03 Jul 2020 13:25:25 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 718DD301124; Fri, 3 Jul 2020 15:25:23 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 5F59B20A9E7A6; Fri, 3 Jul 2020 15:25:23 +0200 (CEST) Date: Fri, 3 Jul 2020 15:25:23 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Marco Elver , Nick Desaulniers , Sami Tolvanen , Masahiro Yamada , Will Deacon , Greg Kroah-Hartman , Kees Cook , clang-built-linux , Kernel Hardening , linux-arch , Linux ARM , Linux Kbuild mailing list , LKML , linux-pci@vger.kernel.org, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" Subject: Re: [PATCH 00/22] add support for Clang LTO Message-ID: <20200703132523.GM117543@hirez.programming.kicks-ass.net> References: <20200630201243.GD4817@hirez.programming.kicks-ass.net> <20200630203016.GI9247@paulmck-ThinkPad-P72> <20200701114027.GO4800@hirez.programming.kicks-ass.net> <20200701140654.GL9247@paulmck-ThinkPad-P72> <20200701150512.GH4817@hirez.programming.kicks-ass.net> <20200701160338.GN9247@paulmck-ThinkPad-P72> <20200702082040.GB4781@hirez.programming.kicks-ass.net> <20200702175948.GV9247@paulmck-ThinkPad-P72> <20200703131330.GX4800@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200703131330.GX4800@hirez.programming.kicks-ass.net> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Fri, Jul 03, 2020 at 03:13:30PM +0200, Peter Zijlstra wrote: > > The prototype for GCC is here: https://github.com/AKG001/gcc/ > > Thanks! Those test cases are somewhat over qualified though: > > static volatile _Atomic (TYPE) * _Dependent_ptr a; \ One question though; since its a qualifier, and we've recently spend a whole lot of effort to strip qualifiers in say READ_ONCE(), how does, and how do we want, this qualifier to behave. C++ has very convenient means of manipulating qualifiers, so it's not much of a problem there, but for C it is, as we've found, really quite cumbersome. Even with _Generic() we can't manipulate individual qualifiers afaict.