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rcu: Parameterize rcu_check_gp_start_stall()
In order to debug forward-progress stalls, it is necessary to check for excessively delayed grace-period starts. This is currently done for RCU CPU stall warnings by rcu_check_gp_start_stall(), which checks to see if the start of a requested grace period has been delayed by an RCU CPU stall warning period. Because rcutorture will need to check for the time consumed by an RCU forward-progress delay, this commit promotes gpssdelay from a local variable to a formal parameter. It is not necessary to export rcu_check_gp_start_stall() because rcutorture will access it via a wrapper function. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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1 changed files with 4 additions and 4 deletions
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@ -2600,10 +2600,10 @@ static void force_quiescent_state(void)
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* This function checks for grace-period requests that fail to motivate
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* RCU to come out of its idle mode.
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*/
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static void
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rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp)
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void
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rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp,
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const unsigned long gpssdelay)
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{
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const unsigned long gpssdelay = rcu_jiffies_till_stall_check();
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unsigned long flags;
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unsigned long j;
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struct rcu_node *rnp_root = rcu_get_root();
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@ -2690,7 +2690,7 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
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local_irq_restore(flags);
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}
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rcu_check_gp_start_stall(rnp, rdp);
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rcu_check_gp_start_stall(rnp, rdp, rcu_jiffies_till_stall_check());
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/* If there are callbacks ready, invoke them. */
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if (rcu_segcblist_ready_cbs(&rdp->cblist))
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