Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765387AbXEYU3T (ORCPT ); Fri, 25 May 2007 16:29:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755974AbXEYU3F (ORCPT ); Fri, 25 May 2007 16:29:05 -0400 Received: from caramon.arm.linux.org.uk ([217.147.92.249]:3952 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765202AbXEYU3E (ORCPT ); Fri, 25 May 2007 16:29:04 -0400 Date: Fri, 25 May 2007 21:28:54 +0100 From: Russell King To: Satyam Sharma Cc: Linux Kernel Mailing List Subject: Re: double exclamation (!!) suckage in the kernel Message-ID: <20070525202854.GA24801@flint.arm.linux.org.uk> Mail-Followup-To: Satyam Sharma , Linux Kernel Mailing List References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 755 Lines: 27 On Sat, May 26, 2007 at 01:53:59AM +0530, Satyam Sharma wrote: > Are all these occurrences merely the debris of > s/something/!notsomething/g kind of patches or is there some > dark, unknown C / gcc wizardry I have absolutely no clue of? Try building and running this: #include int main() { int i; for (i = 0; i < 10; i++) printf("%d: %d\n", i, !!i); return 0; } and you should see it's effect. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: - 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/