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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0DD7AC55185 for ; Wed, 22 Apr 2020 11:37:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC61A20784 for ; Wed, 22 Apr 2020 11:37:31 +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="si7drRH+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726957AbgDVLhb (ORCPT ); Wed, 22 Apr 2020 07:37:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726261AbgDVLha (ORCPT ); Wed, 22 Apr 2020 07:37:30 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 498B9C03C1A8; Wed, 22 Apr 2020 04:37:30 -0700 (PDT) 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; bh=js1Zyy8BIVwm7dXq/z2cFwiQcL5H3VEJb75X+ObOHy0=; b=si7drRH+3Qj4mrA77klXk9QyQL 7bxV6TMaNDF91zyCSY45V7w9RPD2n1UAvKhYQu1lpZMA0Mcotn+AOAHjgvkEsxDiw+c9H3xRbYsVZ yAA9fjjvm3HYEI9JumzLK02x7EsqinSd8nT2EfRDC+2BK+uokrXb11aP67/hX8c10W/siQtBM/B0U fGtR+GVh5HL+SqL0ShYHAx+Ug9RcvM3cf7r8f4kFwwTjajY/W2TkSCSJO/LWPAEPFFIc2ub6XPn2P qs+dOv2EUBRiRL60MNgV4JtMgxw+TJYAVWdpL8JkrlbIl3Ni0pDCE9v7oTCEaD4SSI5I7AbUJo1Qf j0bp07ww==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRDgy-0002eM-2Z; Wed, 22 Apr 2020 11:37:24 +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 C708C30477A; Wed, 22 Apr 2020 13:37:21 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 9933C20280194; Wed, 22 Apr 2020 13:37:21 +0200 (CEST) Date: Wed, 22 Apr 2020 13:37:21 +0200 From: Peter Zijlstra To: Will Deacon Cc: Linus Torvalds , Linux Kernel Mailing List , linux-arch , Android Kernel Team , Mark Rutland , Michael Ellerman , Segher Boessenkool , Christian Borntraeger , Luc Van Oostenryck , Arnd Bergmann , Peter Oberparleiter , Masahiro Yamada , Nick Desaulniers Subject: Re: [PATCH v4 00/11] Rework READ_ONCE() to improve codegen Message-ID: <20200422113721.GA20730@hirez.programming.kicks-ass.net> References: <20200421151537.19241-1-will@kernel.org> <20200422081838.GA29541@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200422081838.GA29541@willie-the-truck> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 22, 2020 at 09:18:39AM +0100, Will Deacon wrote: > On Tue, Apr 21, 2020 at 11:42:56AM -0700, Linus Torvalds wrote: > > On Tue, Apr 21, 2020 at 8:15 AM Will Deacon wrote: > > > > > > It's me again. This is version four of the READ_ONCE() codegen improvement > > > patches [...] > > > > Let's just plan on biting the bullet and do this for 5.8. I'm assuming > > that I'll juet get a pull request from you? > > Sure thing, thanks. I'll get it into -next along with the arm64 bits for > 5.8, but I'll send it as a separate pull when the time comes. I'll also > include the sparc32 changes because otherwise the build falls apart and > we'll get an army of angry robots yelling at us (they seem to form the > majority of the active sparc32 user base afaict). So I'm obviously all for these patches; do note however that it collides most mighty with the KCSAN stuff, which I believe is still pending.