From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753872Ab2LKO5m (ORCPT ); Tue, 11 Dec 2012 09:57:42 -0500 Received: from unicorn.mansr.com ([78.86.181.103]:48529 "EHLO unicorn.mansr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753030Ab2LKO5l convert rfc822-to-8bit (ORCPT ); Tue, 11 Dec 2012 09:57:41 -0500 X-Greylist: delayed 460 seconds by postgrey-1.27 at vger.kernel.org; Tue, 11 Dec 2012 09:57:41 EST From: =?iso-8859-1?Q?M=E5ns_Rullg=E5rd?= To: Christoph Lameter Cc: David Rientjes , Pekka Enberg , glommer@parallels.com, js1304@gmail.com, linux-kernel@vger.kernel.org Subject: Re: signed size_t ? References: <50c71402.BHvgqw/3pK2m2gAL%fengguang.wu@intel.com> <0000013b8a5f57c0-442ea272-5d51-4870-af48-ed948a98b2ef-000000@email.amazonses.com> Date: Tue, 11 Dec 2012 14:49:59 +0000 In-Reply-To: <0000013b8a5f57c0-442ea272-5d51-4870-af48-ed948a98b2ef-000000@email.amazonses.com> (Christoph Lameter's message of "Tue, 11 Dec 2012 14:30:02 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Christoph Lameter writes: > On Tue, 11 Dec 2012, kbuild test robot wrote: > >> mm/slab_common.c: In function 'create_boot_cache': >> mm/slab_common.c:219:6: warning: format '%zd' expects argument of type 'signed size_t', but argument 3 has type 'size_t' [-Wformat] > > We already changed that once from %td to %zd so that the size_t works > correctly. If the argument is correctly of type size_t, the format should be '%zu' since size_t is unsigned. > Does a signed size_t make any sense? A signed type corresponding to size_t sometimes makes sense and it's called ssize_t. -- Måns Rullgård mans@mansr.com