From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757468Ab0HCSQt (ORCPT ); Tue, 3 Aug 2010 14:16:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15274 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757140Ab0HCSQs (ORCPT ); Tue, 3 Aug 2010 14:16:48 -0400 From: Eric Paris Subject: [PATCH] kernel: rounddown helper function To: linux-kernel@vger.kernel.org, selinux@tycho.nsa.gov Cc: akpm@linux-foundation.org, sds@tycho.nsa.gov, jmorris@namei.org Date: Tue, 03 Aug 2010 14:16:07 -0400 Message-ID: <20100803181607.30614.36916.stgit@paris.rdu.redhat.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The roundup() helper function will round a given value up to a multiple of another given value. aka roundup(11, 7) would give 14 = 7 * 2. This new function does the opposite. It will round a given number down to the nearest multiple of the second number: rounddown(11, 7) would give 7. I need this in some future SELinux code and can carry the macro myself, but figured I would put it in the core kernel so others might find and use it if need be. Signed-off-by: Eric Paris --- include/linux/kernel.h | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 7d5b10f..d6092fd 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -59,6 +59,7 @@ extern const char linux_proc_banner[]; #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) +#define rounddown(x, y) ((x) - ((x) % (y))) #define DIV_ROUND_CLOSEST(x, divisor)( \ { \ typeof(divisor) __divisor = divisor; \