Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753373AbWKCR31 (ORCPT ); Fri, 3 Nov 2006 12:29:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753393AbWKCR31 (ORCPT ); Fri, 3 Nov 2006 12:29:27 -0500 Received: from raven.upol.cz ([158.194.120.4]:1170 "EHLO raven.upol.cz") by vger.kernel.org with ESMTP id S1753373AbWKCR30 (ORCPT ); Fri, 3 Nov 2006 12:29:26 -0500 Date: Fri, 3 Nov 2006 18:36:09 +0100 To: Mikulas Patocka Cc: Andrew Morton , Gabriel C , LKML Subject: Re: New filesystem for Linux Message-ID: <20061103173609.GA17080@flower.upol.cz> References: <454A71EB.4000201@googlemail.com> <20061102174149.3578062d.akpm@osdl.org> <20061103171443.GA16912@flower.upol.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) From: Oleg Verych Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 894 Lines: 33 On Fri, Nov 03, 2006 at 06:09:39PM +0100, Mikulas Patocka wrote: > >In gmane.linux.kernel, you wrote: > >[] > >>From: Andrew Morton > >> > >>As Mikulas points out, (1 << anything) won't be evaluating to zero. > > > >How about integer overflow ? > > C standard defines that shifts by more bits than size of a type are > undefined (in fact 1<<32 produces 1 on i386, because processor uses only 5 > bits of a count). ,-- |#include |int main(void) { | unsigned int b = 1; | | printf("%u\n", (1 << 33)); | printf("%u\n", (b << 33)); | return 0; |} |$ gcc bit.c && ./a.out `-- There *is* difference, isn't it? > Mikulas ____ - 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/