Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755074AbZAONIX (ORCPT ); Thu, 15 Jan 2009 08:08:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755272AbZAONIP (ORCPT ); Thu, 15 Jan 2009 08:08:15 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:41106 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754816AbZAONIO (ORCPT ); Thu, 15 Jan 2009 08:08:14 -0500 Date: Thu, 15 Jan 2009 14:07:40 +0100 From: Ingo Molnar To: Tejun Heo Cc: "H. Peter Anvin" , Brian Gerst , ebiederm@xmission.com, cl@linux-foundation.org, rusty@rustcorp.com.au, travis@sgi.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, steiner@sgi.com, hugh@veritas.com Subject: Re: [patch] add optimized generic percpu accessors Message-ID: <20090115130740.GE21839@elte.hu> References: <496C717F.70204@kernel.org> <73c1f2160901130527s2d61f4ewf0725c3bf1b36a1a@mail.gmail.com> <496C9FB7.9050907@kernel.org> <496D8CEB.5060402@zytor.com> <20090114093834.GA19799@elte.hu> <496F0F50.6070200@kernel.org> <20090115113045.GG22850@elte.hu> <496F2032.5080502@kernel.org> <20090115122611.GJ22850@elte.hu> <496F346B.6020804@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <496F346B.6020804@kernel.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 790 Lines: 28 * Tejun Heo wrote: > It is an optimization and a cleanup, and adds the following new > generic percpu methods: > > percpu_read() > percpu_write() > percpu_add() > percpu_sub() > percpu_or() > percpu_xor() nit: add percpu_and() here ;-) > tj: * fixed generic percpu_sub() definition as Roel Kluin pointed out > * added percpu_and() for completeness's sake > * made generic percpu ops atomic against preemption okay - as long as the optimized versions stay single-instruction i'm a happy camper. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/