From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Mon, 9 Mar 2015 23:58:41 +0000 (-0700)
Subject: rcu: Remove dead code from force_qs_rnp()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c5b5539506f86469dca08310657ca93bbb6c00a5;p=linux-beck.git

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 f2e888c8ec5a..e338a12c3a1b 100644
--- 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 ||