From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265422AbUGDGxM (ORCPT ); Sun, 4 Jul 2004 02:53:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265429AbUGDGxM (ORCPT ); Sun, 4 Jul 2004 02:53:12 -0400 Received: from fw.osdl.org ([65.172.181.6]:51400 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S265422AbUGDGxA (ORCPT ); Sun, 4 Jul 2004 02:53:00 -0400 Date: Sat, 3 Jul 2004 23:51:50 -0700 From: Andrew Morton To: Vojtech Pavlik Cc: pluto@pld-linux.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] [prefetch.h] warning: pointer of type `void *' used in arithmetic' Message-Id: <20040703235150.4b569f34.akpm@osdl.org> In-Reply-To: <20040704064920.GA1194@ucw.cz> References: <200407031832.34780.pluto@pld-linux.org> <20040703171811.1f10c5df.akpm@osdl.org> <20040704064920.GA1194@ucw.cz> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Vojtech Pavlik wrote: > > On Sat, Jul 03, 2004 at 05:18:11PM -0700, Andrew Morton wrote: > > Pawe__ Sikora wrote: > > > > > > warning killed. > > > > > --- /var/tmp/linux/include/linux/prefetch.h.orig 2004-06-16 07:20:25.000000000 +0200 > > > +++ /var/tmp/linux/include/linux/prefetch.h 2004-07-03 18:28:10.478861720 +0200 > > > @@ -59,7 +59,7 @@ > > > { > > > #ifdef ARCH_HAS_PREFETCH > > > char *cp; > > > - char *end = addr + len; > > > + char *end = (char *)addr + len; > > > > What version of the compiler is generating this warning? > > As far as I know, any gcc if and only if you pass "-Wpointer-arith" to > it. The kernel doesn't do that, leaving me wondering ... > This discussion fell off the mailing list (grr). The warning was encountered when building the nvidia driver, and it indeed uses -Wpointer-arith.