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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>
This commit is contained in:
Lubos Lunak
2012-03-21 14:08:24 +01:00
committed by Linus Torvalds
parent 668ce0ac70
commit 2084c24a81
1 changed files with 3 additions and 7 deletions
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10
include/linux/stddef.h
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@@ -3,15 +3,11 @@
#include <linux/compiler.h> #include <linux/compiler.h>
#undef NULL
#if defined(__cplusplus)
#define NULL 0
#else
#define NULL ((void *)0)
#endif
#ifdef __KERNEL__ #ifdef __KERNEL__
#undef NULL
#define NULL ((void *)0)
enum { enum {
false = 0, false = 0,
true = 1 true = 1