Commit 2084c24a authored Mar 21, 2012 by Lubos Lunak Committed by Linus Torvalds Apr 14, 2012

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>

parent 668ce0ac

include/linux/stddef.h

+2 −6

Original line number	Diff line number	Diff line
		@@ -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,

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