From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964916Ab2CUNI1 (ORCPT ); Wed, 21 Mar 2012 09:08:27 -0400 Received: from cantor2.suse.de ([195.135.220.15]:53715 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964786Ab2CUNI0 convert rfc822-to-8bit (ORCPT ); Wed, 21 Mar 2012 09:08:26 -0400 Subject: [PATCH] do not export kernel's NULL #define to userspace From: Lubos Lunak To: Linus Torvalds Cc: Andrew Morton , linux-kernel@vger.kernel.org Date: Wed, 21 Mar 2012 14:08:24 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Content-Disposition: inline Message-Id: <201203211408.25040.l.lunak@suse.cz> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org GCC's NULL is actually __null, which allows detecting some questionable NULL usage and warn about it. Moreover each platform/compiler should have its own stddef.h anyway (which is different from linux/stddef.h). So there's no good reason to leak kernel's NULL to userspace and override what the compiler provides. Signed-off-by: Luboš Luňák --- include/linux/stddef.h | 8 ++------ 1 files changed, 2 insertions(+), 6 deletions(-) diff --git a/include/linux/stddef.h b/include/linux/stddef.h index 6a40c76..1747b67 100644 --- a/include/linux/stddef.h +++ b/include/linux/stddef.h @@ -3,14 +3,10 @@ #include +#ifdef __KERNEL__ + #undef NULL -#if defined(__cplusplus) -#define NULL 0 -#else #define NULL ((void *)0) -#endif - -#ifdef __KERNEL__ enum { false = 0, -- 1.7.3.4 -- Lubos Lunak l.lunak@suse.cz