scftorture: Avoid false-positive warnings in scftorture_invoker()

If the call to set_cpus_allowed_ptr() in scftorture_invoker()
fails, a later WARN_ONCE() complains.  But with the advent of
570a752b7a9b ("lib/smp_processor_id: Use is_percpu_thread() instead of
nr_cpus_allowed"), this complaint can be drowned out by complaints from
smp_processor_id().  The rationale for this change is that scftorture's
kthreads are not marked with PF_NO_SETAFFINITY, which means that a system
administrator could change affinity at any time.

However, scftorture is a torture test, and the system administrator might
well have a valid test-the-test reason for changing affinity.  This commit
therefore changes to raw_smp_processor_id() in order to avoid the noise,
and also adds a WARN_ON_ONCE() to the call to set_cpus_allowed_ptr() in
order to directly detect immediate failure.  There is no WARN_ON_ONCE()
within the test loop, allowing human-reflex-based affinity resetting,
if desired.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index 2377cbb..29e8fc5 100644 (file)
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -405,15 +405,15 @@ static int scftorture_invoker(void *arg)
 
        VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu);
        cpu = scfp->cpu % nr_cpu_ids;
-       set_cpus_allowed_ptr(current, cpumask_of(cpu));
+       WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu)));
        set_user_nice(current, MAX_NICE);
        if (holdoff)
                schedule_timeout_interruptible(holdoff * HZ);
 
-       VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id());
+       VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id());
 
        // Make sure that the CPU is affinitized appropriately during testing.
-       curcpu = smp_processor_id();
+       curcpu = raw_smp_processor_id();
        WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids,
                  "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n",
                  __func__, scfp->cpu, curcpu, nr_cpu_ids);