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xive: Add cache scrub to push watch updates to memory
We use the cache watch to write to some structures that we sometimes want to read back using normal loads. The cache watch facility only writes to the cache though, we need to add a non-invalidating cache scrub to also push the result to memory. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
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