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    SubjectRe: IGMP and rwlock: Dead ocurred again on TILEPro
    From: Chris Metcalf <>
    Date: Thu, 17 Feb 2011 17:49:46 -0500

    > The fix is to disable interrupts for the arch_read_lock family of methods.

    How does that help handle the race when it happens between different
    cpus, instead of between IRQ and non-IRQ context on the same CPU?

    Why don't you just use the generic spinlock based rwlock code on Tile,
    since that is all that your atomic instructions can handle

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