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    SubjectRe: [PATCH] Define a NO_GPIO macro to compare against and to use as an invalid GPIO
    David, you convinced me:-) I'll redo the patch. Just one comment:

    On Sat, 9 Feb 2008, David Brownell wrote:

    > On Saturday 09 February 2008, Guennadi Liakhovetski wrote:
    > > And when those platforms share drivers, problems
    > > arise. And the simple and efficient NO_IRQ notion, that would fis those
    > > problems nicely, cannot seem to establish itself.
    > Inertia is one of the problems there ... plus, the only
    > obvious advantage of "#define NO_IRQ 0" is that it makes
    > it easier to be lazy about initialization.
    > Plus, changing platforms to use that convention means they
    > mostly need to adopt an *unnatural* step of mapping from the
    > hardware IRQ numbers (which often start at zero, as they do
    > on one system I just ssh'd into) to some "logical" ID.
    > Even if you believe that's worthwhile, it's work; and it
    > could easily break something.

    NO_IRQ doesn't have to be 0. Platforms, where 0 is a valid number can use
    -1, or 256, or whatever they want:-)

    Guennadi Liakhovetski

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