From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753300AbbJETsc (ORCPT ); Mon, 5 Oct 2015 15:48:32 -0400 Received: from casper.infradead.org ([85.118.1.10]:41525 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751801AbbJETs2 (ORCPT ); Mon, 5 Oct 2015 15:48:28 -0400 Date: Mon, 5 Oct 2015 21:48:24 +0200 From: Peter Zijlstra To: Will Deacon Cc: Davidlohr Bueso , Ingo Molnar , Thomas Gleixner , Andrew Morton , Linus Torvalds , "Paul E.McKenney" , "linux-kernel@vger.kernel.org" , Davidlohr Bueso Subject: Re: [PATCH 1/5] asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec atomics Message-ID: <20151005194824.GF3816@twins.programming.kicks-ass.net> References: <1443643395-17016-1-git-send-email-dave@stgolabs.net> <1443643395-17016-2-git-send-email-dave@stgolabs.net> <20151001063910.GN2881@worktop.programming.kicks-ass.net> <20151005173243.GF3211@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151005173243.GF3211@arm.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 05, 2015 at 06:32:43PM +0100, Will Deacon wrote: > On Thu, Oct 01, 2015 at 07:39:10AM +0100, Peter Zijlstra wrote: > > On Wed, Sep 30, 2015 at 01:03:11PM -0700, Davidlohr Bueso wrote: > > > Similar to what we have for regular add/sub calls. For now, no actual arch > > > implements them, so everyone falls back to the default atomics... iow, > > > nothing changes. These will be used in future primitives. > > > > > > > Maybe also do an aargh64 patch for this? > > I can follow up with that, since I'm about 60% through adding the > relaxed/acquire/release versions of all the other primitives. It's a fair > amount of work thanks to the new atomic instructions making me do everything > twice... (that and I've been on holiday this past week!) Right, what I meant was arm (I thought argh64 was the one with _relaxed bits in, but my memories tricked me, it was ARM). If you add new _relaxed ops, we'd better convert all archs that support _relaxed, which would be ARM (for now).