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    SubjectRe: [PATCH] Fix queued SIGIO
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    > The problem is really that SI_SIGIO is negative, but it should be positive
    > to make SI_FROMUSER return false on it.
    >
    > Changing it would unfortunately break binary compatibility. This patch

    Why ?

    > It'll break programs that try to send SI_SIGIO (=-5) signals from userspace,
    > but I think that is ok.

    Why not just add SI_KERNSIGINFO .. and use that ?
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