squash! torture: Add a hazptrtorture.c stress test

[ paulmck: Apply kernel test robot feedback. ]

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

include/linux/torture.h

diff --git a/include/linux/torture.h b/include/linux/torture.h
index ff3f688..66d2d44 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -131,7 +131,7 @@ void _torture_stop_kthread(char *m, struct task_struct **tp);
 #endif
 void torture_sched_set_normal(struct task_struct *t, int nice);
 
-#if IS_REACHABLE(CONFIG_RCU_TORTURE_TEST) || IS_REACHABLE(CONFIG_LOCK_TORTURE_TEST) || IS_REACHABLE(CONFIG_HAZPTR_TORTURE_TEST)
+#if IS_ENABLED(CONFIG_RCU_TORTURE_TEST) || IS_ENABLED(CONFIG_LOCK_TORTURE_TEST) || IS_ENABLED(CONFIG_HAZPTR_TORTURE_TEST)
 long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask, bool dowarn);
 #endif
 

kernel/rcu/update.c

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 7cce69b..2a778b8 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -44,6 +44,7 @@
 #include <linux/slab.h>
 #include <linux/irq_work.h>
 #include <linux/rcupdate_trace.h>
+#include <linux/torture.h>
 
 #define CREATE_TRACE_POINTS
 
@@ -525,7 +526,7 @@ EXPORT_SYMBOL_GPL(do_trace_rcu_torture_read);
 	do { } while (0)
 #endif
 
-#if IS_REACHABLE(CONFIG_RCU_TORTURE_TEST) || IS_REACHABLE(CONFIG_LOCK_TORTURE_TEST) || IS_REACHABLE(CONFIG_HAZPTR_TORTURE_TEST)
+#if IS_ENABLED(CONFIG_RCU_TORTURE_TEST) || IS_ENABLED(CONFIG_LOCK_TORTURE_TEST) || IS_ENABLED(CONFIG_HAZPTR_TORTURE_TEST)
 /* Get rcutorture access to sched_setaffinity(). */
 long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask, bool dowarn)
 {