linux-kernel - [PATCH tip/core/rcu 44/52] rcu: Simplify rcutorture_get_gp

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Message-Id: <20180829223854.4055-44-paulmck@linux.vnet.ibm.com>
Date:   Wed, 29 Aug 2018 15:38:46 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 44/52] rcu: Simplify rcutorture_get_gp_data()

This commit restructures rcutorture_get_gp_data() to take advantage of
the fact that there is only one flavor of RCU.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index cec025cc1f87..0eccfd02e0b3 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -597,21 +597,16 @@ EXPORT_SYMBOL_GPL(show_rcu_gp_kthreads);
 void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
 			    unsigned long *gp_seq)
 {
-	struct rcu_state *rsp = NULL;
-
 	switch (test_type) {
 	case RCU_FLAVOR:
 	case RCU_BH_FLAVOR:
 	case RCU_SCHED_FLAVOR:
-		rsp = &rcu_state;
+		*flags = READ_ONCE(rcu_state.gp_flags);
+		*gp_seq = rcu_seq_current(&rcu_state.gp_seq);
 		break;
 	default:
 		break;
 	}
-	if (rsp == NULL)
-		return;
-	*flags = READ_ONCE(rsp->gp_flags);
-	*gp_seq = rcu_seq_current(&rsp->gp_seq);
 }
 EXPORT_SYMBOL_GPL(rcutorture_get_gp_data);
 
-- 
2.17.1