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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-11-21 20:19:17 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-12-11 09:18:29 -0800
commita2f2577d96ad060b65eb909dd39b57d676754119 (patch)
treef05ed19020bde2f8998d5a8e1ac873bfd7c5d8be /kernel
parent4ced3314fd3a73dabac4e8a41747883eff36c3e8 (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/locking/locktorture.c6
-rw-r--r--kernel/rcu/rcuperf.c6
-rw-r--r--kernel/rcu/rcutorture.c6
-rw-r--r--kernel/torture.c6
4 files changed, 5 insertions, 19 deletions
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 2a1fc2a58910..6850ffd69125 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -77,10 +77,6 @@ struct lock_stress_stats {
long n_lock_acquired;
};
-int torture_runnable = IS_ENABLED(MODULE);
-module_param(torture_runnable, int, 0444);
-MODULE_PARM_DESC(torture_runnable, "Start locktorture at module init");
-
/* Forward reference. */
static void lock_torture_cleanup(void);
@@ -866,7 +862,7 @@ static int __init lock_torture_init(void)
&percpu_rwsem_lock_ops,
};
- if (!torture_init_begin(torture_type, verbose, &torture_runnable))
+ if (!torture_init_begin(torture_type, verbose))
return -EBUSY;
/* Process args and tell the world that the torturer is on the job. */
diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index 1f87a02c3399..d1ebdf9868bb 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
@@ -106,10 +106,6 @@ static int rcu_perf_writer_state;
#define MAX_MEAS 10000
#define MIN_MEAS 100
-static int perf_runnable = IS_ENABLED(MODULE);
-module_param(perf_runnable, int, 0444);
-MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot");
-
/*
* Operations vector for selecting different types of tests.
*/
@@ -646,7 +642,7 @@ rcu_perf_init(void)
&tasks_ops,
};
- if (!torture_init_begin(perf_type, verbose, &perf_runnable))
+ if (!torture_init_begin(perf_type, verbose))
return -EBUSY;
/* Process args and tell the world that the perf'er is on the job. */
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 1074ecc3f72f..308e6fdbced8 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -187,10 +187,6 @@ static const char *rcu_torture_writer_state_getname(void)
return rcu_torture_writer_state_names[i];
}
-static int torture_runnable = IS_ENABLED(MODULE);
-module_param(torture_runnable, int, 0444);
-MODULE_PARM_DESC(torture_runnable, "Start rcutorture at boot");
-
#if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU)
#define rcu_can_boost() 1
#else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */
@@ -1729,7 +1725,7 @@ rcu_torture_init(void)
&sched_ops, &tasks_ops,
};
- if (!torture_init_begin(torture_type, verbose, &torture_runnable))
+ if (!torture_init_begin(torture_type, verbose))
return -EBUSY;
/* Process args and tell the world that the torturer is on the job. */
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;
}

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