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    SubjectRe: [PATCH] do not export kernel's NULL #define to userspace
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    On Wednesday 21 March 2012, Lubos Lunak wrote:
    > > If so, we might have to replace it with a __KERNEL_NULL constant
    > > or something, like we do for the stuff in linux/types.h, so we
    > > don't accidentally break user applications that rely on the
    > > header files to be self-contained.
    > >
    > > I think there is at least a NULL usage in linux/wireless.h and some
    > > netfilter headers.
    >
    > I see. How about the attached patch then?

    Strictly speaking, you should not include standard headers from kernel
    provided headers, and the problems would be similar to those before
    your patch: anyone who currently doesn't include <stddef.h> but has
    their own definition of NULL will still get a conflict from including
    a kernel header that includes <linux/stddef.h>.

    Arnd


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