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rcutorture: Announce declining to forward-progress test

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Currently, rcu_torture_fwd_prog_cr() announces function entry,
but silently exits if rcu_fwd_emergency_stop is set or if there is no
->call() function available.  This could cause confusion, leading people
to believe that rcu_torture_fwd_prog_cr() is on the job when it is not.
This commit therefore also announces the early exits from this function.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2026-07-28 13:55:15 -07:00
parent aaf43c458c
commit 6c22d64011
1 changed files with 7 additions and 3 deletions
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10
kernel/rcu/rcutorture.c
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@ -3623,13 +3623,17 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
unsigned long stopat;
unsigned long stoppedat;
pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
if (READ_ONCE(rcu_fwd_emergency_stop))
if (READ_ONCE(rcu_fwd_emergency_stop)) {
pr_alert("%s: Emergency stop, so no forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
return; /* Get out of the way quickly, no GP wait! */
if (!cur_ops->call)
}
if (!cur_ops->call) {
pr_alert("%s: No ->call(), so no forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
return; /* Can't do call_rcu() fwd prog without ->call. */
}
/* Loop continuously posting RCU callbacks. */
pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);
atomic_inc(&rcu_fwd_cb_nodelay);
cur_ops->sync(); /* Later readers see above write. */
WRITE_ONCE(rfp->rcu_fwd_startat, jiffies);