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rcu: Add WRITE_ONCE() to rcu_state ->gp_req_activity
The rcu_state structure's ->gp_req_activity field is read locklessly, so this commit adds the WRITE_ONCE() to an update in order to provide proper documentation and READ_ONCE()/WRITE_ONCE() pairing. This data race was reported by KCSAN. Not appropriate for backporting due to failure being unlikely. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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parent
0937d04573
commit
2906d2154c
1 changed files with 2 additions and 2 deletions
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@ -1200,7 +1200,7 @@ static bool rcu_start_this_gp(struct rcu_node *rnp_start, struct rcu_data *rdp,
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}
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trace_rcu_this_gp(rnp, rdp, gp_seq_req, TPS("Startedroot"));
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WRITE_ONCE(rcu_state.gp_flags, rcu_state.gp_flags | RCU_GP_FLAG_INIT);
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rcu_state.gp_req_activity = jiffies;
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WRITE_ONCE(rcu_state.gp_req_activity, jiffies);
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if (!rcu_state.gp_kthread) {
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trace_rcu_this_gp(rnp, rdp, gp_seq_req, TPS("NoGPkthread"));
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goto unlock_out;
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@ -1775,7 +1775,7 @@ static void rcu_gp_cleanup(void)
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rcu_segcblist_is_offloaded(&rdp->cblist);
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if ((offloaded || !rcu_accelerate_cbs(rnp, rdp)) && needgp) {
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WRITE_ONCE(rcu_state.gp_flags, RCU_GP_FLAG_INIT);
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rcu_state.gp_req_activity = jiffies;
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WRITE_ONCE(rcu_state.gp_req_activity, jiffies);
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trace_rcu_grace_period(rcu_state.name,
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READ_ONCE(rcu_state.gp_seq),
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TPS("newreq"));
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