On Wed, Apr 30 2008, Paul E. McKenney wrote:(BTW a lot of thanks for your comments, I've read and understood most of it, I'll reply in due time - perhaps not until next week, I'll be gone from this afternoon and until monday). We cannot always fallback to wait, unfortunately. If irqs are disabled, you could deadlock between two CPUs each waiting for each others IPI ack. So the good question is how to handle the problem. The easiest would be to return ENOMEM and get rid of the fallback, but the fallback deadlocks are so far mostly in the theoretical realm since it PROBABLY would not occur in practice. But still no good enough, so I'm still toying with ideas on how to make it 100% bullet proof. -- Jens Axboe --
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