2.6.12-rc2, with CONFIG_PREEMPT and CONFIG_PREEMPT_DEBUG. The
in_atomic() macro thinks that preempt_disable() indicates an atomic
region so calls to __might_sleep() result in a stack trace.
preempt_count() returns 1, no soft or hard irqs are running and no
spinlocks are held. It looks like there is no way to distinguish
between the use of preempt_disable() in the lock functions (atomic) and
preempt_disable() outside the lock functions (do nothing that might
migrate me).
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