rcu: Remove dead code from force_qs_rnp()

Because force_qs_rnp() is invoked only from the force-quiescent-state
code which runs only in the context of the grace-period kthread, a grace
period must always be in progress throughout force_qs_rnp()'s execution.
This commit therefore removes the rcu_gp_in_progress() check and the
associated dead code.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f2e888c8ec5a097baa86f88d65bd18a975d7fbbd..e338a12c3a1bac3d0ccf6acb2636975d8ec9786c 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2720,10 +2720,6 @@ static void force_qs_rnp(struct rcu_state *rsp,
                mask = 0;
                raw_spin_lock_irqsave(&rnp->lock, flags);
                smp_mb__after_unlock_lock();
-               if (!rcu_gp_in_progress(rsp)) {
-                       raw_spin_unlock_irqrestore(&rnp->lock, flags);
-                       return;
-               }
                if (rnp->qsmask == 0) {
                        if (rcu_state_p == &rcu_sched_state ||
                            rsp != rcu_state_p ||