refscale: Correct affinity check

The current affinity check works fine until there are more reader
processes than CPUs, at which point the affinity check is looking for
non-existent CPUs.  This commit therefore applies the same modulus to
the check as is present in the set_cpus_allowed_ptr() call.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 0db9db73f57f2597cba09b2dca3e81ceac264f95..25910ebe95c0f2fac32ef977cd9737d6f5e61762 100644 (file)
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -829,7 +829,7 @@ repeat:
                goto end;
 
        // Make sure that the CPU is affinitized appropriately during testing.
-       WARN_ON_ONCE(raw_smp_processor_id() != me);
+       WARN_ON_ONCE(raw_smp_processor_id() != me % nr_cpu_ids);
 
        WRITE_ONCE(rt->start_reader, 0);
        if (!atomic_dec_return(&n_started))