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xen: events: Process event channels notifications in round-robin order.
Avoids fairness issue resulting from domain 0 processing lowest numbered event channel first. Fixes bug #1115 "Event channel port scanning unfair". Bugzilla: http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1115 Signed-off-by: Ian Campbell <ian.campbell@citrix.com> [ijc: forward ported from linux-2.6.18-xen.hg 324:7fe1c6d02a2b various variables have different names in this tree: l1 -> pending_words l2 -> pending_bits l1i -> word_idx l2i -> bit_idx] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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