linux-kernel - [PATCH tip/core/rcu 08/52] rcu: Remove rsp parameter from rcu_check_gp_kthread

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Date:   Wed, 29 Aug 2018 15:38:10 -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 08/52] rcu: Remove rsp parameter from rcu_check_gp_kthread_starvation()

There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions.  This commit therefore removes the rsp parameter from
rcu_check_gp_kthread_starvation().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 7f3e93eb726a..0f419554122a 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1239,10 +1239,11 @@ static const char *gp_state_getname(short gs)
 /*
  * Complain about starvation of grace-period kthread.
  */
-static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
+static void rcu_check_gp_kthread_starvation(void)
 {
 	unsigned long gpa;
 	unsigned long j;
+	struct rcu_state *rsp = &rcu_state;
 
 	j = jiffies;
 	gpa = READ_ONCE(rsp->gp_activity);
@@ -1376,7 +1377,7 @@ static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gp_seq)
 		WRITE_ONCE(rsp->jiffies_stall,
 			   jiffies + 3 * rcu_jiffies_till_stall_check() + 3);
 
-	rcu_check_gp_kthread_starvation(rsp);
+	rcu_check_gp_kthread_starvation();
 
 	panic_on_rcu_stall();
 
@@ -1414,7 +1415,7 @@ static void print_cpu_stall(struct rcu_state *rsp)
 		jiffies - rsp->gp_start,
 		(long)rcu_seq_current(&rsp->gp_seq), totqlen);
 
-	rcu_check_gp_kthread_starvation(rsp);
+	rcu_check_gp_kthread_starvation();
 
 	rcu_dump_cpu_stacks(rsp);
 
-- 
2.17.1