rcu: Make expedited grace periods resolve stall-warning ties
Currently, if a grace period ends just as the stall-warning timeout
fires, an empty stall warning will be printed. This is not helpful,
so this commit avoids these useless warnings by rechecking completion
after awakening in synchronize_sched_expedited_wait().
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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