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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>
hifive-unleashed-5.1
Paul E. McKenney 2018-10-01 15:42:44 -07:00
parent b3c1d9ec7c
commit 791416c471
1 changed files with 4 additions and 4 deletions
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8
kernel/rcu/tree.c
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@ -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))