From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752386AbdKTTdG (ORCPT ); Mon, 20 Nov 2017 14:33:06 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:41393 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752028AbdKTTdE (ORCPT ); Mon, 20 Nov 2017 14:33:04 -0500 Date: Mon, 20 Nov 2017 20:32:56 +0100 From: Peter Zijlstra To: Will Deacon Cc: Sami Tolvanen , "Paul E. McKenney" , Nick Desaulniers , Alex Matveev , Andi Kleen , Ard Biesheuvel , Greg Hackmann , Kees Cook , linux-arm-kernel@lists.infradead.org, Linux Kbuild mailing list , LKML , Mark Rutland , Masahiro Yamada , Maxim Kuvyrkov , Michal Marek , Yury Norov , Matthias Kaehlcke , Alexander Potapenko , Stephen Hines , Pirama Arumuga Nainar , Manoj Gupta Subject: Re: [PATCH v2 18/18] arm64: select ARCH_SUPPORTS_LTO_CLANG Message-ID: <20171120193256.e6fnn2arwqc5wqkp@hirez.programming.kicks-ass.net> References: <20171116165922.llrojrvomuihabrt@hirez.programming.kicks-ass.net> <20171116173417.nqsh5dpu65uj7b5s@hirez.programming.kicks-ass.net> <20171116174830.GX3624@linux.vnet.ibm.com> <20171116183950.GA3624@linux.vnet.ibm.com> <20171116184508.GC21898@arm.com> <20171116191307.GC3624@linux.vnet.ibm.com> <20171116201701.GA143965@samitolvanen.mtv.corp.google.com> <20171120180554.GM32488@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171120180554.GM32488@arm.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 20, 2017 at 06:05:55PM +0000, Will Deacon wrote: > Although the current direction of the C++ committee is to prefer > that dependencies are explicitly "marked", this is not deemed to be > acceptable for the kernel (in other words, everything is always considered > "marked"). Yeah, that is an attitude not compatible with existing code. Much like the proposal to allow temporary/wide stores on everything not explicitly declared atomic. Such stuff instantly breaks all extant code that does multi-threading with no recourse.