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Subject[PATCH] do not export kernel's NULL #define to userspace
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 <linux/compiler.h>

+#ifdef __KERNEL__
#undef NULL
-#if defined(__cplusplus)
-#define NULL 0
#define NULL ((void *)0)
-#ifdef __KERNEL__

enum {
false = 0,
Lubos Lunak
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