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由 Paul E. McKenney 提交于
This commit is the second step towards full abstraction of all accesses to the ->dynticks counter, implementing the previously open-coded atomic add of zero in a new rcu_dynticks_snap() function. This abstraction will ease changes o the ->dynticks counter operation. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org>
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