Nathan Whitehorn f574af0d6d Use atomic operations to mask and unmask IRQs. This prevents a problem
(obvious in retrospect) in which interrupts on one CPU that are temporarily
masked can end up permanently masked when a handler on another CPU clobbers
the interrupt mask register with an old copy.
2011-06-23 04:35:45 +00:00
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MFC
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MFC
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MFC
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