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xive: Use an allocator for EQDs
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This adds a bitmap allocator for EQDs. They are allocated in groups
of 8 naturally aligned. The VP structures associated with physical
CPUs now have all 8 EQDs available though only one is provisioned
and enabled.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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@ozbenh @stewartsmith
ozbenh authored and stewartsmith committed Jan 5, 2017
1 parent 439b19e commit 2026df3
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