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rcu: Make rcu_gp_cleanup() write only once to ->gp_flags
At the end of rcu_gp_cleanup(), if another grace period is needed, but not via rcu_accelerate_cbs(), the ->gp_flags field is written twice, once when making the new grace-period request, and once when clearing all other types of requests. This commit therefore adds an else-clause to avoid this double write. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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1 changed files with 2 additions and 1 deletions
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@ -2117,8 +2117,9 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
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rsp->gp_req_activity = jiffies;
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trace_rcu_grace_period(rsp->name, READ_ONCE(rsp->gpnum),
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TPS("newreq"));
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} else {
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WRITE_ONCE(rsp->gp_flags, rsp->gp_flags & RCU_GP_FLAG_INIT);
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}
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WRITE_ONCE(rsp->gp_flags, rsp->gp_flags & RCU_GP_FLAG_INIT);
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raw_spin_unlock_irq_rcu_node(rnp);
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}
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