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For the most part, a thread hard lock - which requires hard irqs to be
off - is nested with the mutex lock to access the protected
sections. Therefore we would not benefit in the common case from the
preemption disabling feature we are going to add to the EVL-specific
spinlock. Make it a hard lock to clarify the intent.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>