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When a group interrupt cannot be delivered, we need to: - increment the backlog counter for the group in the NVG table (if the END is configured to keep a backlog). - start a broadcast operation to set the LSMFB field on matching CPUs which can't take the interrupt now because they're running at too high a priority. [npiggin: squash in fixes from milesg] [milesg: only load the NVP if the END is !ignore] [milesg: always broadcast backlog, not only when there are precluded VPs] Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Kowal <kowal@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>