torture: Remove support for SRCU-lite

Because SRCU-lite is being replaced by SRCU-fast, this commit removes
support for SRCU-lite from refscale.c.

Both SRCU-lite and SRCU-fast provide faster readers by dropping the
smp_mb() call from their lock and unlock primitives, but incur a pair
of added RCU grace periods during the SRCU grace period.  There is a
trivial mapping from the SRCU-lite API to that of SRCU-fast, so there
should be no transition issues.

[ paulmck: Apply Christoph Hellwig feedback. ]

Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index f11a7c2af778cd1148988d8beb433c956517ce82..f4b2cea1cce5eb5caf362442270eeb810100066c 100644 (file)
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -246,36 +246,6 @@ static const struct ref_scale_ops srcu_fast_ops = {
        .name           = "srcu-fast"
 };
 
-static void srcu_lite_ref_scale_read_section(const int nloops)
-{
-       int i;
-       int idx;
-
-       for (i = nloops; i >= 0; i--) {
-               idx = srcu_read_lock_lite(srcu_ctlp);
-               srcu_read_unlock_lite(srcu_ctlp, idx);
-       }
-}
-
-static void srcu_lite_ref_scale_delay_section(const int nloops, const int udl, const int ndl)
-{
-       int i;
-       int idx;
-
-       for (i = nloops; i >= 0; i--) {
-               idx = srcu_read_lock_lite(srcu_ctlp);
-               un_delay(udl, ndl);
-               srcu_read_unlock_lite(srcu_ctlp, idx);
-       }
-}
-
-static const struct ref_scale_ops srcu_lite_ops = {
-       .init           = rcu_sync_scale_init,
-       .readsection    = srcu_lite_ref_scale_read_section,
-       .delaysection   = srcu_lite_ref_scale_delay_section,
-       .name           = "srcu-lite"
-};
-
 #ifdef CONFIG_TASKS_RCU
 
 // Definitions for RCU Tasks ref scale testing: Empty read markers.
@@ -1193,7 +1163,7 @@ ref_scale_init(void)
        long i;
        int firsterr = 0;
        static const struct ref_scale_ops *scale_ops[] = {
-               &rcu_ops, &srcu_ops, &srcu_fast_ops, &srcu_lite_ops, RCU_TRACE_OPS RCU_TASKS_OPS
+               &rcu_ops, &srcu_ops, &srcu_fast_ops, RCU_TRACE_OPS RCU_TASKS_OPS
                &refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops,
                &acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops,
                &typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,