rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass
Fixes and workarounds for a number of issues (for example, that in df4012edc) make it safe to once again detect dyntick-idle CPUs on the first pass of force_quiescent_state(), so this commit makes that change. Signed-off-by: NPaul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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