Re: panic in do_last()

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On Thu, Apr 17, 2014 at 07:35:14PM -0700, Lin Ming wrote:
> Added a barrier(), but still panic.

Wrong kind of barrier ;-)  This one just says the compiler that it
shouldn't reorder; it doesn't help other CPUs at all.

Read Documentation/memory-barriers.txt for details, but I seriously
wonder if we _want_ to mess with barriers in the first place...
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