sched,locktorture: Convert to sched_set_fifo()

Because SCHED_FIFO is a broken scheduler model (see previous patches)
take away the priority field, the kernel can't possibly make an
informed decision.

Effectively changes prio from 99 to 50.

Cc: paulmck@kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index 5efbfc6..fca41a7 100644 (file)
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -436,8 +436,6 @@ static int torture_rtmutex_lock(void) __acquires(torture_rtmutex)
 
 static void torture_rtmutex_boost(struct torture_random_state *trsp)
 {
-       int policy;
-       struct sched_param param;
        const unsigned int factor = 50000; /* yes, quite arbitrary */
 
        if (!rt_task(current)) {
@@ -448,8 +446,7 @@ static void torture_rtmutex_boost(struct torture_random_state *trsp)
                 */
                if (trsp && !(torture_random(trsp) %
                              (cxt.nrealwriters_stress * factor))) {
-                       policy = SCHED_FIFO;
-                       param.sched_priority = MAX_RT_PRIO - 1;
+                       sched_set_fifo(current);
                } else /* common case, do nothing */
                        return;
        } else {
@@ -462,13 +459,10 @@ static void torture_rtmutex_boost(struct torture_random_state *trsp)
                 */
                if (!trsp || !(torture_random(trsp) %
                               (cxt.nrealwriters_stress * factor * 2))) {
-                       policy = SCHED_NORMAL;
-                       param.sched_priority = 0;
+                       sched_set_normal(current, 0);
                } else /* common case, do nothing */
                        return;
        }
-
-       sched_setscheduler_nocheck(current, policy, &param);
 }
 
 static void torture_rtmutex_delay(struct torture_random_state *trsp)