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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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      Last update: 2012-03-21 14:11    [W:0.025 / U:1.508 seconds]
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