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    SubjectRe: [PATCH -tip] x86: headers - fix export private data to userspace
    Harvey Harrison wrote:
    > On Tue, 2009-01-13 at 21:34 +0300, Cyrill Gorcunov wrote:
    >> Impact: cleanup
    >
    >> 4) setup.h - COMMAND_LINE_SIZE saved for userspace, bootloaders
    >> could use it.
    >
    > Doesn't this need to be (at least) _COMMAND_LINE_SIZE to avoid
    > polluting the namespace, not sure it can be changed though as the
    > horse is already out of the barn.

    No, this is not one of those cases, but it's worth explaining why.

    You can introduce symbols into the general namespace if *and only if*
    they are in a header file that is invoked directly by the user. In
    other words, such a header file is unusable by libc, but setup.h doesn't
    contain anything needed by libc in the first place.

    -hpa

    --
    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.



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