rcutorture: Print negatives for SRCU counter wraparound

The srcu_torture_stats() function prints SRCU's per-CPU c[] array with
an unsigned format, which means that the number one less than zero is
a very large number.  This commit therefore prints this array with a
signed format in order to improve readability of the rcutorture output.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 0bc5f0a4c1ab..80d2d2440210 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -492,9 +492,11 @@ static void srcu_torture_stats(char *page)
         page += sprintf(page, "%s%s per-CPU(idx=%d):",
                        torture_type, TORTURE_FLAG, idx);
         for_each_possible_cpu(cpu) {
-                page += sprintf(page, " %d(%lu,%lu)", cpu,
-                               per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx],
-                               per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]);
+                long c0, c1;
+
+                c0 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx];
+                c1 = (long)per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx];
+                page += sprintf(page, " %d(%ld,%ld)", cpu, c0, c1);
         }
         sprintf(page, "\n");
 }