Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755279AbXKFQkq (ORCPT ); Tue, 6 Nov 2007 11:40:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753265AbXKFQki (ORCPT ); Tue, 6 Nov 2007 11:40:38 -0500 Received: from astoria.ccjclearline.com ([64.235.106.9]:52403 "EHLO astoria.ccjclearline.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753228AbXKFQki (ORCPT ); Tue, 6 Nov 2007 11:40:38 -0500 Date: Tue, 6 Nov 2007 11:38:52 -0500 (EST) From: "Robert P. J. Day" X-X-Sender: rpjday@localhost.localdomain To: Linux Kernel Mailing List cc: Andrew Morton , matthew@wil.cx Subject: [PATCH] Add the macro to test if "exactly_one_bit_set" to log2.h. Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - astoria.ccjclearline.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - crashcourse.ca X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1166 Lines: 39 While this macro is defined in terms of "is_power_of_2" and is therefore functionally equivalent, the visual semantics are sometimes more appropriate for what is actually being tested. Signed-off-by: Robert P. J. Day --- diff --git a/include/linux/log2.h b/include/linux/log2.h index c8cf5e8..d0d324e 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -55,6 +55,12 @@ bool is_power_of_2(unsigned long n) } /* + * And for folks who want slightly different semantics ... + */ + +#define exactly_one_bit_set is_power_of_2 + +/* * round up to nearest power of two */ static inline __attribute__((const)) -- ======================================================================== Robert P. J. Day Linux Consulting, Training and Annoying Kernel Pedantry Waterloo, Ontario, CANADA http://crashcourse.ca ======================================================================== - 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/