Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751510Ab3HTVaB (ORCPT ); Tue, 20 Aug 2013 17:30:01 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:37704 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751178Ab3HTVaA (ORCPT ); Tue, 20 Aug 2013 17:30:00 -0400 Date: Tue, 20 Aug 2013 14:29:56 -0700 From: Andrew Morton To: "Nicholas A. Bellinger" Cc: Christoph Lameter , Kent Overstreet , linux-kernel@vger.kernel.org, Tejun Heo , Oleg Nesterov , Ingo Molnar , Andi Kleen , Jens Axboe Subject: Re: [PATCH] idr: Use this_cpu_ptr() for percpu_ida Message-Id: <20130820142956.1194d8c798abf53f884a1fb6@linux-foundation.org> In-Reply-To: <1377033546.32763.4.camel@haakon3.risingtidesystems.com> References: <1375896905-6074-1-git-send-email-kmo@daterainc.com> <1375896905-6074-5-git-send-email-kmo@daterainc.com> <0000014059ec4c34-1bb53d48-c9ee-4e71-81b8-253026431c5c-000000@email.amazonses.com> <20130807183345.GA11612@kmo-pixel> <000001405a4b39ef-0715410a-5061-41e9-9414-86559f16570d-000000@email.amazonses.com> <20130807195733.GB11612@kmo-pixel> <000001405e5776ba-bcc96088-b5e8-4abe-b98e-2e9d7d9b112b-000000@email.amazonses.com> <1377033546.32763.4.camel@haakon3.risingtidesystems.com> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1581 Lines: 35 On Tue, 20 Aug 2013 14:19:06 -0700 "Nicholas A. Bellinger" wrote: > On Thu, 2013-08-08 at 14:32 +0000, Christoph Lameter wrote: > > On Wed, 7 Aug 2013, Kent Overstreet wrote: > > > > > One thing that was bugging me - I was never able to figure out for sure > > > if smp_processor_id() returns a number in the range [0, nr_cpu_ids), at > > > least I couldn't find where it was documented - could you tell me if > > > that's true? > > > > I always assumed that it was in the range 0 ... nr_cpu_ids - 1 and that is > > the assumption under which the kernel code was written. Things would break > > horribly if smp_process_id would return nr_cpu_ids or higher. > > > > Hi guys, > > Just a heads up that I've put Kent's standalone percpu-ida patch (with > Christoph's recommend changes) into target-pending/for-next here: > > https://git.kernel.org/cgit/linux/kernel/git/nab/target-pending.git/commit/?h=for-next&id=47bd524a5b3eb6429b058b8b562b45329ab2c9e7 > > I've got a number of target patches that depend on this code for v3.12, > and a delay on this particular piece would be painful to endure.. > > Sooo, please yell loudly if there is an objection to percpu-ida merge as > a completely standalone item, that does not effect any existing ida > code. Was hoping that Tejun had time. I'll take a look... -- 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/