torture: Eliminate torture_runnable and perf_runnable

The purpose of torture_runnable is to allow rcutorture and locktorture
to be started and stopped via sysfs when they are built into the kernel
(as in not compiled as loadable modules).  However, the 0444 permissions
for both instances of torture_runnable prevent this use case from ever
being put into practice.  Given that there have been no complaints
about this deficiency, it is reasonable to conclude that no one actually
makes use of this sysfs capability.  The perf_runnable module parameter
for rcuperf is in the same situation.

This commit therefore removes both torture_runnable instances as well
as perf_runnable.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/kernel/torture.c b/kernel/torture.c
index 3bcbd4fbfe18..572576ad9f58 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -61,7 +61,6 @@ static bool verbose;
 #define FULLSTOP_RMMOD    2	/* Normal rmmod of torture. */
 static int fullstop = FULLSTOP_RMMOD;
 static DEFINE_MUTEX(fullstop_mutex);
-static int *torture_runnable;
 
 #ifdef CONFIG_HOTPLUG_CPU
 
@@ -577,7 +576,7 @@ void stutter_wait(const char *title)
 
 	cond_resched_rcu_qs();
 	spt = READ_ONCE(stutter_pause_test);
-	while (spt || (torture_runnable && !READ_ONCE(*torture_runnable))) {
+	while (spt) {
 		if (spt == 1) {
 			schedule_timeout_interruptible(1);
 		} else if (spt == 2) {
@@ -649,7 +648,7 @@ static void torture_stutter_cleanup(void)
  * The runnable parameter points to a flag that controls whether or not
  * the test is currently runnable.  If there is no such flag, pass in NULL.
  */
-bool torture_init_begin(char *ttype, bool v, int *runnable)
+bool torture_init_begin(char *ttype, bool v)
 {
 	mutex_lock(&fullstop_mutex);
 	if (torture_type != NULL) {
@@ -661,7 +660,6 @@ bool torture_init_begin(char *ttype, bool v, int *runnable)
 	}
 	torture_type = ttype;
 	verbose = v;
-	torture_runnable = runnable;
 	fullstop = FULLSTOP_DONTSTOP;
 	return true;
 }