rcuperf: Don't treat gp_exp mis-setting as a WARN

0day found a boot warning triggered in rcu_perf_writer() on !SMP kernel:

	WARN_ON(rcu_gp_is_normal() && gp_exp);

, the root cause of which is trying to measure expedited grace
periods(by setting gp_exp to true by default) when all the grace periods
are normal(TINY RCU only has normal grace periods).

However, such a mis-setting would only result in failing to measure the
performance for a specific kind of grace periods, therefore using a
WARN_ON to check this is a little overkilling. We could handle this
inside rcuperf module via some error messages to tell users about the
mis-settings.

Therefore this patch removes the WARN_ON in rcu_perf_writer() and
handles those checkings in rcu_perf_init() with plain if() code.

Moreover, this patch changes the default value of gp_exp to 1) align
with rcutorture tests and 2) make the default setting work for all RCU
implementations by default.

Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Fixes: http://lkml.kernel.org/r/57411b10.mFvG0+AgcrMXGtcj%fengguang.wu@intel.com
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index afd174e901c3..7b2dbdffd791 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
@@ -58,7 +58,7 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.ibm.com>");
 #define VERBOSE_PERFOUT_ERRSTRING(s) \
         do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0)
 
-torture_param(bool, gp_exp, true, "Use expedited GP wait primitives");
+torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
 torture_param(int, holdoff, 10, "Holdoff time before test start (s)");
 torture_param(int, nreaders, -1, "Number of RCU reader threads");
 torture_param(int, nwriters, -1, "Number of RCU updater threads");
@@ -358,8 +358,6 @@ rcu_perf_writer(void *arg)
         u64 *wdpp = writer_durations[me];
 
         VERBOSE_PERFOUT_STRING("rcu_perf_writer task started");
-        WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp);
-        WARN_ON(rcu_gp_is_normal() && gp_exp);
         WARN_ON(!wdpp);
         set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
         sp.sched_priority = 1;
@@ -626,6 +624,16 @@ rcu_perf_init(void)
                 firsterr = -ENOMEM;
                 goto unwind;
         }
+        if (rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp) {
+                VERBOSE_PERFOUT_ERRSTRING("All grace periods expedited, no normal ones to measure!");
+                firsterr = -EINVAL;
+                goto unwind;
+        }
+        if (rcu_gp_is_normal() && gp_exp) {
+                VERBOSE_PERFOUT_ERRSTRING("All grace periods normal, no expedited ones to measure!");
+                firsterr = -EINVAL;
+                goto unwind;
+        }
         for (i = 0; i < nrealwriters; i++) {
                 writer_durations[i] =
                         kcalloc(MAX_MEAS, sizeof(*writer_durations[i]),