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| author | Lubos Lunak <l.lunak@suse.cz> | 2012-03-21 14:08:24 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-14 07:47:49 -0700 |
| commit | 2084c24a81413b75bc97e4bee56b32ffece70460 (patch) | |
| tree | 299c0e84719c352eea4c79db560912f858b08b33 | |
| parent | 668ce0ac707719d866af7e432e518af7b4c575ad (diff) | |
| download | linux-stable-2084c24a81413b75bc97e4bee56b32ffece70460.tar.gz linux-stable-2084c24a81413b75bc97e4bee56b32ffece70460.tar.bz2 linux-stable-2084c24a81413b75bc97e4bee56b32ffece70460.zip | |
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 <l.lunak@suse.cz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | 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 6a40c76bdcf1..1747b6787b9e 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, |