rcu: Remove fast check path from __synchronize_srcu()
The fastpath in __synchronize_srcu() is designed to handle cases where there are a large number of concurrent calls for the same srcu_struct structure. However, the Linux kernel currently does not use SRCU in this manner, so remove the fastpath checks for simplicity. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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