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xive: Add a per-cpu logging mechanism to XICS emulation
This is a small 32-entries rolling buffer that logs a few operations. It's useful to debug odd problems. The output is printed when opal_xive_dump() is called. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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