From 2084c24a81413b75bc97e4bee56b32ffece70460 Mon Sep 17 00:00:00 2001
From: Lubos Lunak <l.lunak@suse.cz>
Date: Wed, 21 Mar 2012 14:08:24 +0100
Subject: [PATCH] do not export kernel's NULL #define to userspace
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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 <l.lunak@suse.cz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/stddef.h | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index 6a40c76bdcf1a..1747b6787b9e9 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -3,14 +3,10 @@
#include <linux/compiler.h>
+#ifdef __KERNEL__
+
#undef NULL
-#if defined(__cplusplus)
-#define NULL 0
-#else
#define NULL ((void *)0)
-#endif
-
-#ifdef __KERNEL__
enum {
false = 0,