From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751938AbYGYPMx (ORCPT ); Fri, 25 Jul 2008 11:12:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750974AbYGYPMp (ORCPT ); Fri, 25 Jul 2008 11:12:45 -0400 Received: from outbound-sin.frontbridge.com ([207.46.51.80]:7434 "EHLO SG2EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750729AbYGYPMo (ORCPT ); Fri, 25 Jul 2008 11:12:44 -0400 X-BigFish: VPS4(zzzz10d3izzz32i43j62h) X-Spam-TCS-SCL: 1:0 X-WSS-ID: 0K4KI8W-04-38E-01 From: Joerg Roedel To: Andrew Morton CC: linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH] introduce lower_32_bits() macro Date: Fri, 25 Jul 2008 17:12:27 +0200 Message-ID: <1216998747-16896-1-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.3.7 X-OriginalArrivalTime: 25 Jul 2008 15:12:27.0576 (UTC) FILETIME=[D9A86380:01C8EE68] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The file kernel.h contains the upper_32_bits macro. This patch adds the other part, the lower_32_bits macro. Its first use will be in the driver for AMD IOMMU. Signed-off-by: Joerg Roedel --- include/linux/kernel.h | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index f9cd7a5..6fd2977 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -73,6 +73,12 @@ extern const char linux_proc_banner[]; */ #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) +/** + * lower_32_bits - return bits 0-31 of a number + * @n: the number we're accessing + */ +#define lower_32_bits(n) ((n) & 0xffffffffULL) + #define KERN_EMERG "<0>" /* system is unusable */ #define KERN_ALERT "<1>" /* action must be taken immediately */ #define KERN_CRIT "<2>" /* critical conditions */ -- 1.5.3.7