mirror of https://gitee.com/openkylin/linux.git
rcu: Remove unnecessary spinlock in rcu_boot_init_percpu_data()
Since rcu_boot_init_percpu_data() is only called at boot time, there is no data race and spinlock is not needed. Signed-off-by: Lihao Liang <lianglihao@huawei.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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7928b2cbe5
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@ -3636,12 +3636,9 @@ static void rcu_init_new_rnp(struct rcu_node *rnp_leaf)
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static void __init
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rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
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{
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unsigned long flags;
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struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
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struct rcu_node *rnp = rcu_get_root(rsp);
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/* Set up local state, ensuring consistent view of global state. */
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raw_spin_lock_irqsave_rcu_node(rnp, flags);
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rdp->grpmask = leaf_node_cpu_bit(rdp->mynode, cpu);
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rdp->dynticks = &per_cpu(rcu_dynticks, cpu);
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WARN_ON_ONCE(rdp->dynticks->dynticks_nesting != 1);
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@ -3649,7 +3646,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
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rdp->cpu = cpu;
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rdp->rsp = rsp;
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rcu_boot_init_nocb_percpu_data(rdp);
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raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
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}
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/*
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