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79f92663e3
your task is rescheduled to a different cpu after you've taken the lock but before calling RW_LOCK_HELD is called. We need the spinlock to ensure there is a wmb() there. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@68 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c