scftorture: Add debug output for wrong-CPU warning

This commit adds the desired CPU, the actual CPU, and nr_cpu_ids to
the wrong-CPU warning in scftorture_invoker(), the better to help with
debugging.

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

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index d55a9f8cda3d48dd654fcbb5e0ff11cc031ac298..2377cbb324742e47692179279876ebf8ee36d7cd 100644 (file)
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -398,6 +398,7 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 static int scftorture_invoker(void *arg)
 {
        int cpu;
+       int curcpu;
        DEFINE_TORTURE_RANDOM(rand);
        struct scf_statistics *scfp = (struct scf_statistics *)arg;
        bool was_offline = false;
@@ -412,7 +413,10 @@ static int scftorture_invoker(void *arg)
        VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id());
 
        // Make sure that the CPU is affinitized appropriately during testing.
-       WARN_ON_ONCE(smp_processor_id() != scfp->cpu);
+       curcpu = 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);
 
        if (!atomic_dec_return(&n_started))
                while (atomic_read_acquire(&n_started)) {