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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-10-01 15:42:44 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-11-12 09:03:59 -0800 |
| commit | 791416c47153b45f640d52baaf30995d9d396a08 (patch) | |
| tree | 535695e9d2f711625424e23435438b2dc5bcb364 /kernel/rcu/tree.c | |
| parent | b3c1d9ec7c59feadd22693f43145d8285bd35b04 (diff) | |
| download | lwn-791416c47153b45f640d52baaf30995d9d396a08.tar.gz lwn-791416c47153b45f640d52baaf30995d9d396a08.zip | |
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>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 4933f5d9d992..36e30150e1e9 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2600,10 +2600,10 @@ static void force_quiescent_state(void) * This function checks for grace-period requests that fail to motivate * RCU to come out of its idle mode. */ -static void -rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp) +void +rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp, + const unsigned long gpssdelay) { - const unsigned long gpssdelay = rcu_jiffies_till_stall_check(); unsigned long flags; unsigned long j; struct rcu_node *rnp_root = rcu_get_root(); @@ -2690,7 +2690,7 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused local_irq_restore(flags); } - rcu_check_gp_start_stall(rnp, rdp); + rcu_check_gp_start_stall(rnp, rdp, rcu_jiffies_till_stall_check()); /* If there are callbacks ready, invoke them. */ if (rcu_segcblist_ready_cbs(&rdp->cblist)) |